[PATCH v2 0/1] drivers: net: cpsw: Fix NULL pointer dereference with two slave PHYs

[PATCH v2 0/1] drivers: net: cpsw: Fix NULL pointer dereference with two slave PHYs

[Andrew Goodbody]

Resend to add more people on Cc: as requested by Grygrii Strashko.

This is a fix for a NULL pointer dereference from cpsw which is triggered
by having two slave PHYs attached to a cpsw network device. The problem is
due to only maintaining a single reference to a PHY node in the prive data
which gets overwritten by the second PHY probe. So move the PHY node
reference to the individual slave data so that there is now one per slave.

v1 had a problem that data->slaves was used before it had been filled in

Andrew Goodbody (1):
  Prevent NUll pointer dereference with two PHYs on cpsw

 drivers/net/ethernet/ti/cpsw.c | 30 +++++++++++++++---------------
 1 file changed, 15 insertions(+), 15 deletions(-)

-- 
2.5.0

[PATCH v2 1/1] drivers: net: cpsw: Prevent NUll pointer dereference with two PHYs

[Andrew Goodbody]

Adding a 2nd PHY to cpsw results in a NULL pointer dereference
as below. Fix by maintaining a reference to each PHY node in slave
struct instead of a single reference in the priv struct which was
overwritten by the 2nd PHY.

[   17.870933] Unable to handle kernel NULL pointer dereference at virtual address 00000180
[   17.879557] pgd = dc8bc000
[   17.882514] [00000180] *pgd=9c882831, *pte=00000000, *ppte=00000000
[   17.889213] Internal error: Oops: 17 [#1] ARM
[   17.893838] Modules linked in:
[   17.897102] CPU: 0 PID: 1657 Comm: connmand Not tainted 4.5.0-ge463dfb-dirty #11
[   17.904947] Hardware name: Cambrionix whippet
[   17.909576] task: dc859240 ti: dc968000 task.ti: dc968000
[   17.915339] PC is at phy_attached_print+0x18/0x8c
[   17.920339] LR is at phy_attached_info+0x14/0x18
[   17.925247] pc : [<c042baec>]    lr : [<c042bb74>]    psr: 600f0113
[   17.925247] sp : dc969cf8  ip : dc969d28  fp : dc969d18
[   17.937425] r10: dda7a400  r9 : 00000000  r8 : 00000000
[   17.942971] r7 : 00000001  r6 : ddb00480  r5 : ddb8cb34  r4 : 00000000
[   17.949898] r3 : c0954cc0  r2 : c09562b0  r1 : 00000000  r0 : 00000000
[   17.956829] Flags: nZCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment none
[   17.964401] Control: 10c5387d  Table: 9c8bc019  DAC: 00000051
[   17.970500] Process connmand (pid: 1657, stack limit = 0xdc968210)
[   17.977059] Stack: (0xdc969cf8 to 0xdc96a000)
[   17.981692] 9ce0:                                                       dc969d28 dc969d08
[   17.990386] 9d00: c038f9bc c038f6b4 ddb00480 dc969d34 dc969d28 c042bb74 c042bae4 00000000
[   17.999080] 9d20: c09562b0 c0954cc0 dc969d5c dc969d38 c043ebfc c042bb6c 00000007 00000003
[   18.007773] 9d40: ddb00000 ddb8cb58 ddb00480 00000001 dc969dec dc969d60 c0441614 c043ea68
[   18.016465] 9d60: 00000000 00000003 00000000 fffffff4 dc969df4 0000000d 00000000 00000000
[   18.025159] 9d80: dc969db4 dc969d90 c005dc08 c05839e0 dc969df4 0000000d ddb00000 00001002
[   18.033851] 9da0: 00000000 00000000 dc969dcc dc969db8 c005ddf4 c005dbc8 00000000 00000118
[   18.042544] 9dc0: dc969dec dc969dd0 ddb00000 c06db27c ffff9003 00001002 00000000 00000000
[   18.051237] 9de0: dc969e0c dc969df0 c057c88c c04410dc dc969e0c ddb00000 ddb00000 00000001
[   18.059930] 9e00: dc969e34 dc969e10 c057cb44 c057c7d8 ddb00000 ddb00138 00001002 beaeda20
[   18.068622] 9e20: 00000000 00000000 dc969e5c dc969e38 c057cc28 c057cac0 00000000 dc969e80
[   18.077315] 9e40: dda7a40c beaeda20 00000000 00000000 dc969ecc dc969e60 c05e36d0 c057cc14
[   18.086007] 9e60: dc969e84 00000051 beaeda20 00000000 dda7a40c 00000014 ddb00000 00008914
[   18.094699] 9e80: 30687465 00000000 00000000 00000000 00009003 00000000 00000000 00000000
[   18.103391] 9ea0: 00001002 00008914 dd257ae0 beaeda20 c098a428 beaeda20 00000011 00000000
[   18.112084] 9ec0: dc969edc dc969ed0 c05e4e54 c05e3030 dc969efc dc969ee0 c055f5ac c05e4cc4
[   18.120777] 9ee0: beaeda20 dd257ae0 dc8ab4c0 00008914 dc969f7c dc969f00 c010b388 c055f45c
[   18.129471] 9f00: c071ca40 dd257ac0 c00165e8 dc968000 dc969f3c dc969f20 dc969f64 dc969f28
[   18.138164] 9f20: c0115708 c0683ec8 dd257ac0 dd257ac0 dc969f74 dc969f40 c055f350 c00fc66c
[   18.146857] 9f40: dd82e4d0 00000011 00000000 00080000 dd257ac0 00000000 dc8ab4c0 dc8ab4c0
[   18.155550] 9f60: 00008914 beaeda20 00000011 00000000 dc969fa4 dc969f80 c010bc34 c010b2fc
[   18.164242] 9f80: 00000000 00000011 00000002 00000036 c00165e8 dc968000 00000000 dc969fa8
[   18.172935] 9fa0: c00163e0 c010bbcc 00000000 00000011 00000011 00008914 beaeda20 00009003
[   18.181628] 9fc0: 00000000 00000011 00000002 00000036 00081018 00000001 00000000 beaedc10
[   18.190320] 9fe0: 00083188 beaeda1c 00043a5d b6d29c0c 600b0010 00000011 00000000 00000000
[   18.198989] Backtrace:
[   18.201621] [<c042bad8>] (phy_attached_print) from [<c042bb74>] (phy_attached_info+0x14/0x18)
[   18.210664]  r3:c0954cc0 r2:c09562b0 r1:00000000
[   18.215588]  r4:ddb00480
[   18.218322] [<c042bb60>] (phy_attached_info) from [<c043ebfc>] (cpsw_slave_open+0x1a0/0x280)
[   18.227293] [<c043ea5c>] (cpsw_slave_open) from [<c0441614>] (cpsw_ndo_open+0x544/0x674)
[   18.235874]  r7:00000001 r6:ddb00480 r5:ddb8cb58 r4:ddb00000
[   18.241944] [<c04410d0>] (cpsw_ndo_open) from [<c057c88c>] (__dev_open+0xc0/0x128)
[   18.249972]  r9:00000000 r8:00000000 r7:00001002 r6:ffff9003 r5:c06db27c r4:ddb00000
[   18.258255] [<c057c7cc>] (__dev_open) from [<c057cb44>] (__dev_change_flags+0x90/0x154)
[   18.266745]  r5:00000001 r4:ddb00000
[   18.270575] [<c057cab4>] (__dev_change_flags) from [<c057cc28>] (dev_change_flags+0x20/0x50)
[   18.279523]  r9:00000000 r8:00000000 r7:beaeda20 r6:00001002 r5:ddb00138 r4:ddb00000
[   18.287811] [<c057cc08>] (dev_change_flags) from [<c05e36d0>] (devinet_ioctl+0x6ac/0x76c)
[   18.296483]  r9:00000000 r8:00000000 r7:beaeda20 r6:dda7a40c r5:dc969e80 r4:00000000
[   18.304762] [<c05e3024>] (devinet_ioctl) from [<c05e4e54>] (inet_ioctl+0x19c/0x1c8)
[   18.312882]  r10:00000000 r9:00000011 r8:beaeda20 r7:c098a428 r6:beaeda20 r5:dd257ae0
[   18.321235]  r4:00008914
[   18.323956] [<c05e4cb8>] (inet_ioctl) from [<c055f5ac>] (sock_ioctl+0x15c/0x2d8)
[   18.331829] [<c055f450>] (sock_ioctl) from [<c010b388>] (do_vfs_ioctl+0x98/0x8d0)
[   18.339765]  r7:00008914 r6:dc8ab4c0 r5:dd257ae0 r4:beaeda20
[   18.345822] [<c010b2f0>] (do_vfs_ioctl) from [<c010bc34>] (SyS_ioctl+0x74/0x84)
[   18.353573]  r10:00000000 r9:00000011 r8:beaeda20 r7:00008914 r6:dc8ab4c0 r5:dc8ab4c0
[   18.361924]  r4:00000000
[   18.364653] [<c010bbc0>] (SyS_ioctl) from [<c00163e0>] (ret_fast_syscall+0x0/0x3c)
[   18.372682]  r9:dc968000 r8:c00165e8 r7:00000036 r6:00000002 r5:00000011 r4:00000000
[   18.380960] Code: e92dd810 e24cb010 e24dd010 e59b4004 (e5902180)
[   18.387580] ---[ end trace c80529466223f3f3 ]---

Signed-off-by: Andrew Goodbody <andrew.goodbody@cambrionix.com>
---

v2 - Move allocation of memory for priv->slaves to inside cpsw_probe_dt so it
     has data->slaves initialised first which is needed to calculate size

 drivers/net/ethernet/ti/cpsw.c | 30 +++++++++++++++---------------
 1 file changed, 15 insertions(+), 15 deletions(-)

diff --git a/drivers/net/ethernet/ti/cpsw.c b/drivers/net/ethernet/ti/cpsw.c
index 42fdfd4..e62909c 100644
--- a/drivers/net/ethernet/ti/cpsw.c
+++ b/drivers/net/ethernet/ti/cpsw.c
@@ -349,6 +349,7 @@ struct cpsw_slave {
 	struct cpsw_slave_data		*data;
 	struct phy_device		*phy;
 	struct net_device		*ndev;
+	struct device_node		*phy_node;
 	u32				port_vlan;
 	u32				open_stat;
 };
@@ -367,7 +368,6 @@ struct cpsw_priv {
 	spinlock_t			lock;
 	struct platform_device		*pdev;
 	struct net_device		*ndev;
-	struct device_node		*phy_node;
 	struct napi_struct		napi_rx;
 	struct napi_struct		napi_tx;
 	struct device			*dev;
@@ -1148,8 +1148,8 @@ static void cpsw_slave_open(struct cpsw_slave *slave, struct cpsw_priv *priv)
 		cpsw_ale_add_mcast(priv->ale, priv->ndev->broadcast,
 				   1 << slave_port, 0, 0, ALE_MCAST_FWD_2);
 
-	if (priv->phy_node)
-		slave->phy = of_phy_connect(priv->ndev, priv->phy_node,
+	if (slave->phy_node)
+		slave->phy = of_phy_connect(priv->ndev, slave->phy_node,
 				 &cpsw_adjust_link, 0, slave->data->phy_if);
 	else
 		slave->phy = phy_connect(priv->ndev, slave->data->phy_id,
@@ -1946,7 +1946,7 @@ static int cpsw_probe_dt(struct cpsw_priv *priv,
 	struct device_node *node = pdev->dev.of_node;
 	struct device_node *slave_node;
 	struct cpsw_platform_data *data = &priv->data;
-	int i = 0, ret;
+	int i, ret;
 	u32 prop;
 
 	if (!node)
@@ -1958,6 +1958,14 @@ static int cpsw_probe_dt(struct cpsw_priv *priv,
 	}
 	data->slaves = prop;
 
+	priv->slaves = devm_kzalloc(&pdev->dev,
+				    sizeof(struct cpsw_slave) * data->slaves,
+				    GFP_KERNEL);
+	if (!priv->slaves)
+		return -ENOMEM;
+	for (i = 0; i < data->slaves; i++)
+		priv->slaves[i].slave_num = i;
+
 	if (of_property_read_u32(node, "active_slave", &prop)) {
 		dev_err(&pdev->dev, "Missing active_slave property in the DT.\n");
 		return -EINVAL;
@@ -2023,6 +2031,7 @@ static int cpsw_probe_dt(struct cpsw_priv *priv,
 	if (ret)
 		dev_warn(&pdev->dev, "Doesn't have any child node\n");
 
+	i = 0;
 	for_each_child_of_node(node, slave_node) {
 		struct cpsw_slave_data *slave_data = data->slave_data + i;
 		const void *mac_addr = NULL;
@@ -2033,7 +2042,8 @@ static int cpsw_probe_dt(struct cpsw_priv *priv,
 		if (strcmp(slave_node->name, "slave"))
 			continue;
 
-		priv->phy_node = of_parse_phandle(slave_node, "phy-handle", 0);
+		priv->slaves[i].phy_node =
+			of_parse_phandle(slave_node, "phy-handle", 0);
 		parp = of_get_property(slave_node, "phy_id", &lenp);
 		if (of_phy_is_fixed_link(slave_node)) {
 			struct device_node *phy_node;
@@ -2292,16 +2302,6 @@ static int cpsw_probe(struct platform_device *pdev)
 
 	memcpy(ndev->dev_addr, priv->mac_addr, ETH_ALEN);
 
-	priv->slaves = devm_kzalloc(&pdev->dev,
-				    sizeof(struct cpsw_slave) * data->slaves,
-				    GFP_KERNEL);
-	if (!priv->slaves) {
-		ret = -ENOMEM;
-		goto clean_runtime_disable_ret;
-	}
-	for (i = 0; i < data->slaves; i++)
-		priv->slaves[i].slave_num = i;
-
 	priv->slaves[0].ndev = ndev;
 	priv->emac_port = 0;
 
-- 
2.5.0

Re: [PATCH v2 1/1] drivers: net: cpsw: Prevent NUll pointer dereference with two PHYs

[Grygorii Strashko]

Hi,

On 04/19/2016 04:56 PM, Andrew Goodbody wrote:
> Adding a 2nd PHY to cpsw results in a NULL pointer dereference
> as below. Fix by maintaining a reference to each PHY node in slave
> struct instead of a single reference in the priv struct which was
> overwritten by the 2nd PHY.

David, Is it possible to drop prev version of this patch from linux-next
- it breaks boot on many TI boards with -next.


> 
> [   17.870933] Unable to handle kernel NULL pointer dereference at virtual address 00000180
> [   17.879557] pgd = dc8bc000
> [   17.882514] [00000180] *pgd=9c882831, *pte=00000000, *ppte=00000000
> [   17.889213] Internal error: Oops: 17 [#1] ARM
> [   17.893838] Modules linked in:
> [   17.897102] CPU: 0 PID: 1657 Comm: connmand Not tainted 4.5.0-ge463dfb-dirty #11
> [   17.904947] Hardware name: Cambrionix whippet
> [   17.909576] task: dc859240 ti: dc968000 task.ti: dc968000
> [   17.915339] PC is at phy_attached_print+0x18/0x8c
> [   17.920339] LR is at phy_attached_info+0x14/0x18
> [   17.925247] pc : [<c042baec>]    lr : [<c042bb74>]    psr: 600f0113
> [   17.925247] sp : dc969cf8  ip : dc969d28  fp : dc969d18
> [   17.937425] r10: dda7a400  r9 : 00000000  r8 : 00000000
> [   17.942971] r7 : 00000001  r6 : ddb00480  r5 : ddb8cb34  r4 : 00000000
> [   17.949898] r3 : c0954cc0  r2 : c09562b0  r1 : 00000000  r0 : 00000000
> [   17.956829] Flags: nZCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment none
> [   17.964401] Control: 10c5387d  Table: 9c8bc019  DAC: 00000051
> [   17.970500] Process connmand (pid: 1657, stack limit = 0xdc968210)
> [   17.977059] Stack: (0xdc969cf8 to 0xdc96a000)

[...]

> [   18.323956] [<c05e4cb8>] (inet_ioctl) from [<c055f5ac>] (sock_ioctl+0x15c/0x2d8)
> [   18.331829] [<c055f450>] (sock_ioctl) from [<c010b388>] (do_vfs_ioctl+0x98/0x8d0)
> [   18.339765]  r7:00008914 r6:dc8ab4c0 r5:dd257ae0 r4:beaeda20
> [   18.345822] [<c010b2f0>] (do_vfs_ioctl) from [<c010bc34>] (SyS_ioctl+0x74/0x84)
> [   18.353573]  r10:00000000 r9:00000011 r8:beaeda20 r7:00008914 r6:dc8ab4c0 r5:dc8ab4c0
> [   18.361924]  r4:00000000
> [   18.364653] [<c010bbc0>] (SyS_ioctl) from [<c00163e0>] (ret_fast_syscall+0x0/0x3c)
> [   18.372682]  r9:dc968000 r8:c00165e8 r7:00000036 r6:00000002 r5:00000011 r4:00000000
> [   18.380960] Code: e92dd810 e24cb010 e24dd010 e59b4004 (e5902180)
> [   18.387580] ---[ end trace c80529466223f3f3 ]---

^ Could you make it shorter and drop timestamps, pls?

> 
> Signed-off-by: Andrew Goodbody <andrew.goodbody@cambrionix.com>
> ---
> 
> v2 - Move allocation of memory for priv->slaves to inside cpsw_probe_dt so it
>       has data->slaves initialised first which is needed to calculate size
> 
>   drivers/net/ethernet/ti/cpsw.c | 30 +++++++++++++++---------------
>   1 file changed, 15 insertions(+), 15 deletions(-)
> 
> diff --git a/drivers/net/ethernet/ti/cpsw.c b/drivers/net/ethernet/ti/cpsw.c
> index 42fdfd4..e62909c 100644
> --- a/drivers/net/ethernet/ti/cpsw.c
> +++ b/drivers/net/ethernet/ti/cpsw.c
> @@ -349,6 +349,7 @@ struct cpsw_slave {
>   	struct cpsw_slave_data		*data;
>   	struct phy_device		*phy;
>   	struct net_device		*ndev;
> +	struct device_node		*phy_node;
>   	u32				port_vlan;
>   	u32				open_stat;
>   };
> @@ -367,7 +368,6 @@ struct cpsw_priv {
>   	spinlock_t			lock;
>   	struct platform_device		*pdev;
>   	struct net_device		*ndev;
> -	struct device_node		*phy_node;
>   	struct napi_struct		napi_rx;
>   	struct napi_struct		napi_tx;
>   	struct device			*dev;
> @@ -1148,8 +1148,8 @@ static void cpsw_slave_open(struct cpsw_slave *slave, struct cpsw_priv *priv)
>   		cpsw_ale_add_mcast(priv->ale, priv->ndev->broadcast,
>   				   1 << slave_port, 0, 0, ALE_MCAST_FWD_2);
>   
> -	if (priv->phy_node)
> -		slave->phy = of_phy_connect(priv->ndev, priv->phy_node,
> +	if (slave->phy_node)
> +		slave->phy = of_phy_connect(priv->ndev, slave->phy_node,
>   				 &cpsw_adjust_link, 0, slave->data->phy_if);
>   	else
>   		slave->phy = phy_connect(priv->ndev, slave->data->phy_id,
> @@ -1946,7 +1946,7 @@ static int cpsw_probe_dt(struct cpsw_priv *priv,
>   	struct device_node *node = pdev->dev.of_node;
>   	struct device_node *slave_node;
>   	struct cpsw_platform_data *data = &priv->data;
> -	int i = 0, ret;
> +	int i, ret;
>   	u32 prop;
>   
>   	if (!node)
> @@ -1958,6 +1958,14 @@ static int cpsw_probe_dt(struct cpsw_priv *priv,
>   	}
>   	data->slaves = prop;
>   
> +	priv->slaves = devm_kzalloc(&pdev->dev,
> +				    sizeof(struct cpsw_slave) * data->slaves,
> +				    GFP_KERNEL);
> +	if (!priv->slaves)
> +		return -ENOMEM;
> +	for (i = 0; i < data->slaves; i++)
> +		priv->slaves[i].slave_num = i;
> +
>   	if (of_property_read_u32(node, "active_slave", &prop)) {
>   		dev_err(&pdev->dev, "Missing active_slave property in the DT.\n");
>   		return -EINVAL;
> @@ -2023,6 +2031,7 @@ static int cpsw_probe_dt(struct cpsw_priv *priv,
>   	if (ret)
>   		dev_warn(&pdev->dev, "Doesn't have any child node\n");
>   
> +	i = 0;
>   	for_each_child_of_node(node, slave_node) {
>   		struct cpsw_slave_data *slave_data = data->slave_data + i;
>   		const void *mac_addr = NULL;
> @@ -2033,7 +2042,8 @@ static int cpsw_probe_dt(struct cpsw_priv *priv,
>   		if (strcmp(slave_node->name, "slave"))
>   			continue;
>   
> -		priv->phy_node = of_parse_phandle(slave_node, "phy-handle", 0);
> +		priv->slaves[i].phy_node =
> +			of_parse_phandle(slave_node, "phy-handle", 0);

i++?

Ideally, the simplest way is to save phy_node in slave_data, but ...
(see comment below).


>   		parp = of_get_property(slave_node, "phy_id", &lenp);
>   		if (of_phy_is_fixed_link(slave_node)) {
>   			struct device_node *phy_node;
> @@ -2292,16 +2302,6 @@ static int cpsw_probe(struct platform_device *pdev)
>   
>   	memcpy(ndev->dev_addr, priv->mac_addr, ETH_ALEN);
>   
> -	priv->slaves = devm_kzalloc(&pdev->dev,
> -				    sizeof(struct cpsw_slave) * data->slaves,
> -				    GFP_KERNEL);
> -	if (!priv->slaves) {
> -		ret = -ENOMEM;
> -		goto clean_runtime_disable_ret;
> -	}
I don't think you can move this out from here - it will break legacy boot :(


> -	for (i = 0; i < data->slaves; i++)
> -		priv->slaves[i].slave_num = i;

Personally, I see only one safe way to do it without big rework -
do second pass of DT parsing here to fill phy_node field.



> -
>   	priv->slaves[0].ndev = ndev;
>   	priv->emac_port = 0;
>   
> 


-- 
regards,
-grygorii

Re: [PATCH v2 1/1] drivers: net: cpsw: Prevent NUll pointer dereference with two PHYs

[David Rivshin (Allworx)]

On Tue, 19 Apr 2016 17:41:07 +0300
Grygorii Strashko <grygorii.strashko@ti.com> wrote:

> Hi,
> 
> On 04/19/2016 04:56 PM, Andrew Goodbody wrote:
> > Adding a 2nd PHY to cpsw results in a NULL pointer dereference
> > as below. Fix by maintaining a reference to each PHY node in slave
> > struct instead of a single reference in the priv struct which was
> > overwritten by the 2nd PHY.  
> 
> David, Is it possible to drop prev version of this patch from linux-next
> - it breaks boot on many TI boards with -next.
> 
> 
> > 
> > [   17.870933] Unable to handle kernel NULL pointer dereference at virtual address 00000180
> > [   17.879557] pgd = dc8bc000
> > [   17.882514] [00000180] *pgd=9c882831, *pte=00000000, *ppte=00000000
> > [   17.889213] Internal error: Oops: 17 [#1] ARM
> > [   17.893838] Modules linked in:
> > [   17.897102] CPU: 0 PID: 1657 Comm: connmand Not tainted 4.5.0-ge463dfb-dirty #11
> > [   17.904947] Hardware name: Cambrionix whippet
> > [   17.909576] task: dc859240 ti: dc968000 task.ti: dc968000
> > [   17.915339] PC is at phy_attached_print+0x18/0x8c
> > [   17.920339] LR is at phy_attached_info+0x14/0x18
> > [   17.925247] pc : [<c042baec>]    lr : [<c042bb74>]    psr: 600f0113
> > [   17.925247] sp : dc969cf8  ip : dc969d28  fp : dc969d18
> > [   17.937425] r10: dda7a400  r9 : 00000000  r8 : 00000000
> > [   17.942971] r7 : 00000001  r6 : ddb00480  r5 : ddb8cb34  r4 : 00000000
> > [   17.949898] r3 : c0954cc0  r2 : c09562b0  r1 : 00000000  r0 : 00000000
> > [   17.956829] Flags: nZCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment none
> > [   17.964401] Control: 10c5387d  Table: 9c8bc019  DAC: 00000051
> > [   17.970500] Process connmand (pid: 1657, stack limit = 0xdc968210)
> > [   17.977059] Stack: (0xdc969cf8 to 0xdc96a000)  
> 
> [...]
> 
> > [   18.323956] [<c05e4cb8>] (inet_ioctl) from [<c055f5ac>] (sock_ioctl+0x15c/0x2d8)
> > [   18.331829] [<c055f450>] (sock_ioctl) from [<c010b388>] (do_vfs_ioctl+0x98/0x8d0)
> > [   18.339765]  r7:00008914 r6:dc8ab4c0 r5:dd257ae0 r4:beaeda20
> > [   18.345822] [<c010b2f0>] (do_vfs_ioctl) from [<c010bc34>] (SyS_ioctl+0x74/0x84)
> > [   18.353573]  r10:00000000 r9:00000011 r8:beaeda20 r7:00008914 r6:dc8ab4c0 r5:dc8ab4c0
> > [   18.361924]  r4:00000000
> > [   18.364653] [<c010bbc0>] (SyS_ioctl) from [<c00163e0>] (ret_fast_syscall+0x0/0x3c)
> > [   18.372682]  r9:dc968000 r8:c00165e8 r7:00000036 r6:00000002 r5:00000011 r4:00000000
> > [   18.380960] Code: e92dd810 e24cb010 e24dd010 e59b4004 (e5902180)
> > [   18.387580] ---[ end trace c80529466223f3f3 ]---  
> 
> ^ Could you make it shorter and drop timestamps, pls?
> 
> > 
> > Signed-off-by: Andrew Goodbody <andrew.goodbody@cambrionix.com>
> > ---
> > 
> > v2 - Move allocation of memory for priv->slaves to inside cpsw_probe_dt so it
> >       has data->slaves initialised first which is needed to calculate size
> > 
> >   drivers/net/ethernet/ti/cpsw.c | 30 +++++++++++++++---------------
> >   1 file changed, 15 insertions(+), 15 deletions(-)
> > 
> > diff --git a/drivers/net/ethernet/ti/cpsw.c b/drivers/net/ethernet/ti/cpsw.c
> > index 42fdfd4..e62909c 100644
> > --- a/drivers/net/ethernet/ti/cpsw.c
> > +++ b/drivers/net/ethernet/ti/cpsw.c
> > @@ -349,6 +349,7 @@ struct cpsw_slave {
> >   	struct cpsw_slave_data		*data;
> >   	struct phy_device		*phy;
> >   	struct net_device		*ndev;
> > +	struct device_node		*phy_node;
> >   	u32				port_vlan;
> >   	u32				open_stat;
> >   };
> > @@ -367,7 +368,6 @@ struct cpsw_priv {
> >   	spinlock_t			lock;
> >   	struct platform_device		*pdev;
> >   	struct net_device		*ndev;
> > -	struct device_node		*phy_node;
> >   	struct napi_struct		napi_rx;
> >   	struct napi_struct		napi_tx;
> >   	struct device			*dev;
> > @@ -1148,8 +1148,8 @@ static void cpsw_slave_open(struct cpsw_slave *slave, struct cpsw_priv *priv)
> >   		cpsw_ale_add_mcast(priv->ale, priv->ndev->broadcast,
> >   				   1 << slave_port, 0, 0, ALE_MCAST_FWD_2);
> >   
> > -	if (priv->phy_node)
> > -		slave->phy = of_phy_connect(priv->ndev, priv->phy_node,
> > +	if (slave->phy_node)
> > +		slave->phy = of_phy_connect(priv->ndev, slave->phy_node,
> >   				 &cpsw_adjust_link, 0, slave->data->phy_if);
> >   	else
> >   		slave->phy = phy_connect(priv->ndev, slave->data->phy_id,
> > @@ -1946,7 +1946,7 @@ static int cpsw_probe_dt(struct cpsw_priv *priv,
> >   	struct device_node *node = pdev->dev.of_node;
> >   	struct device_node *slave_node;
> >   	struct cpsw_platform_data *data = &priv->data;
> > -	int i = 0, ret;
> > +	int i, ret;
> >   	u32 prop;
> >   
> >   	if (!node)
> > @@ -1958,6 +1958,14 @@ static int cpsw_probe_dt(struct cpsw_priv *priv,
> >   	}
> >   	data->slaves = prop;
> >   
> > +	priv->slaves = devm_kzalloc(&pdev->dev,
> > +				    sizeof(struct cpsw_slave) * data->slaves,
> > +				    GFP_KERNEL);
> > +	if (!priv->slaves)
> > +		return -ENOMEM;
> > +	for (i = 0; i < data->slaves; i++)
> > +		priv->slaves[i].slave_num = i;
> > +
> >   	if (of_property_read_u32(node, "active_slave", &prop)) {
> >   		dev_err(&pdev->dev, "Missing active_slave property in the DT.\n");
> >   		return -EINVAL;
> > @@ -2023,6 +2031,7 @@ static int cpsw_probe_dt(struct cpsw_priv *priv,
> >   	if (ret)
> >   		dev_warn(&pdev->dev, "Doesn't have any child node\n");
> >   
> > +	i = 0;
> >   	for_each_child_of_node(node, slave_node) {
> >   		struct cpsw_slave_data *slave_data = data->slave_data + i;
> >   		const void *mac_addr = NULL;
> > @@ -2033,7 +2042,8 @@ static int cpsw_probe_dt(struct cpsw_priv *priv,
> >   		if (strcmp(slave_node->name, "slave"))
> >   			continue;
> >   
> > -		priv->phy_node = of_parse_phandle(slave_node, "phy-handle", 0);
> > +		priv->slaves[i].phy_node =
> > +			of_parse_phandle(slave_node, "phy-handle", 0);  
> 
> i++?
> 
> Ideally, the simplest way is to save phy_node in slave_data, but ...
> (see comment below).

FYI, I have a patch [1] that does exactly that in my queue. Sorry 
I've been busy and haven't had a chance to rebase/retest/resubmit
since Nicolas gave his Tested-By (and I missed Andrew's original 
patch). I can probably steal some time to resurrect that quickly 
if it's preferred, just let me know.

[1] http://www.spinics.net/lists/netdev/msg357772.html

> 
> 
> >   		parp = of_get_property(slave_node, "phy_id", &lenp);
> >   		if (of_phy_is_fixed_link(slave_node)) {
> >   			struct device_node *phy_node;
> > @@ -2292,16 +2302,6 @@ static int cpsw_probe(struct platform_device *pdev)
> >   
> >   	memcpy(ndev->dev_addr, priv->mac_addr, ETH_ALEN);
> >   
> > -	priv->slaves = devm_kzalloc(&pdev->dev,
> > -				    sizeof(struct cpsw_slave) * data->slaves,
> > -				    GFP_KERNEL);
> > -	if (!priv->slaves) {
> > -		ret = -ENOMEM;
> > -		goto clean_runtime_disable_ret;
> > -	}  
> I don't think you can move this out from here - it will break legacy boot :(
> 
> 
> > -	for (i = 0; i < data->slaves; i++)
> > -		priv->slaves[i].slave_num = i;  
> 
> Personally, I see only one safe way to do it without big rework -
> do second pass of DT parsing here to fill phy_node field.
> 
> 
> 
> > -
> >   	priv->slaves[0].ndev = ndev;
> >   	priv->emac_port = 0;
> >   
> >   
> 
> 

Re: [PATCH v2 1/1] drivers: net: cpsw: Prevent NUll pointer dereference with two PHYs

[Grygorii Strashko]

On 04/19/2016 06:01 PM, David Rivshin (Allworx) wrote:
> On Tue, 19 Apr 2016 17:41:07 +0300
> Grygorii Strashko <grygorii.strashko@ti.com> wrote:
> 
>> Hi,
>>
>> On 04/19/2016 04:56 PM, Andrew Goodbody wrote:
>>> Adding a 2nd PHY to cpsw results in a NULL pointer dereference
>>> as below. Fix by maintaining a reference to each PHY node in slave
>>> struct instead of a single reference in the priv struct which was
>>> overwritten by the 2nd PHY.
>>
>> David, Is it possible to drop prev version of this patch from linux-next
>> - it breaks boot on many TI boards with -next.
>>
>>
>>>
>>> [   17.870933] Unable to handle kernel NULL pointer dereference at virtual address 00000180
>>> [   17.879557] pgd = dc8bc000
>>> [   17.882514] [00000180] *pgd=9c882831, *pte=00000000, *ppte=00000000
>>> [   17.889213] Internal error: Oops: 17 [#1] ARM
>>> [   17.893838] Modules linked in:
>>> [   17.897102] CPU: 0 PID: 1657 Comm: connmand Not tainted 4.5.0-ge463dfb-dirty #11
>>> [   17.904947] Hardware name: Cambrionix whippet
>>> [   17.909576] task: dc859240 ti: dc968000 task.ti: dc968000
>>> [   17.915339] PC is at phy_attached_print+0x18/0x8c
>>> [   17.920339] LR is at phy_attached_info+0x14/0x18
>>> [   17.925247] pc : [<c042baec>]    lr : [<c042bb74>]    psr: 600f0113
>>> [   17.925247] sp : dc969cf8  ip : dc969d28  fp : dc969d18
>>> [   17.937425] r10: dda7a400  r9 : 00000000  r8 : 00000000
>>> [   17.942971] r7 : 00000001  r6 : ddb00480  r5 : ddb8cb34  r4 : 00000000
>>> [   17.949898] r3 : c0954cc0  r2 : c09562b0  r1 : 00000000  r0 : 00000000
>>> [   17.956829] Flags: nZCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment none
>>> [   17.964401] Control: 10c5387d  Table: 9c8bc019  DAC: 00000051
>>> [   17.970500] Process connmand (pid: 1657, stack limit = 0xdc968210)
>>> [   17.977059] Stack: (0xdc969cf8 to 0xdc96a000)
>>
>> [...]
>>
>>> [   18.323956] [<c05e4cb8>] (inet_ioctl) from [<c055f5ac>] (sock_ioctl+0x15c/0x2d8)
>>> [   18.331829] [<c055f450>] (sock_ioctl) from [<c010b388>] (do_vfs_ioctl+0x98/0x8d0)
>>> [   18.339765]  r7:00008914 r6:dc8ab4c0 r5:dd257ae0 r4:beaeda20
>>> [   18.345822] [<c010b2f0>] (do_vfs_ioctl) from [<c010bc34>] (SyS_ioctl+0x74/0x84)
>>> [   18.353573]  r10:00000000 r9:00000011 r8:beaeda20 r7:00008914 r6:dc8ab4c0 r5:dc8ab4c0
>>> [   18.361924]  r4:00000000
>>> [   18.364653] [<c010bbc0>] (SyS_ioctl) from [<c00163e0>] (ret_fast_syscall+0x0/0x3c)
>>> [   18.372682]  r9:dc968000 r8:c00165e8 r7:00000036 r6:00000002 r5:00000011 r4:00000000
>>> [   18.380960] Code: e92dd810 e24cb010 e24dd010 e59b4004 (e5902180)
>>> [   18.387580] ---[ end trace c80529466223f3f3 ]---
>>
>> ^ Could you make it shorter and drop timestamps, pls?
>>
>>>
>>> Signed-off-by: Andrew Goodbody <andrew.goodbody@cambrionix.com>
>>> ---
>>>
>>> v2 - Move allocation of memory for priv->slaves to inside cpsw_probe_dt so it
>>>        has data->slaves initialised first which is needed to calculate size
>>>
>>>    drivers/net/ethernet/ti/cpsw.c | 30 +++++++++++++++---------------
>>>    1 file changed, 15 insertions(+), 15 deletions(-)
>>>
>>> diff --git a/drivers/net/ethernet/ti/cpsw.c b/drivers/net/ethernet/ti/cpsw.c
>>> index 42fdfd4..e62909c 100644
>>> --- a/drivers/net/ethernet/ti/cpsw.c
>>> +++ b/drivers/net/ethernet/ti/cpsw.c
>>> @@ -349,6 +349,7 @@ struct cpsw_slave {
>>>    	struct cpsw_slave_data		*data;
>>>    	struct phy_device		*phy;
>>>    	struct net_device		*ndev;
>>> +	struct device_node		*phy_node;
>>>    	u32				port_vlan;
>>>    	u32				open_stat;
>>>    };
>>> @@ -367,7 +368,6 @@ struct cpsw_priv {
>>>    	spinlock_t			lock;
>>>    	struct platform_device		*pdev;
>>>    	struct net_device		*ndev;
>>> -	struct device_node		*phy_node;
>>>    	struct napi_struct		napi_rx;
>>>    	struct napi_struct		napi_tx;
>>>    	struct device			*dev;
>>> @@ -1148,8 +1148,8 @@ static void cpsw_slave_open(struct cpsw_slave *slave, struct cpsw_priv *priv)
>>>    		cpsw_ale_add_mcast(priv->ale, priv->ndev->broadcast,
>>>    				   1 << slave_port, 0, 0, ALE_MCAST_FWD_2);
>>>    
>>> -	if (priv->phy_node)
>>> -		slave->phy = of_phy_connect(priv->ndev, priv->phy_node,
>>> +	if (slave->phy_node)
>>> +		slave->phy = of_phy_connect(priv->ndev, slave->phy_node,
>>>    				 &cpsw_adjust_link, 0, slave->data->phy_if);
>>>    	else
>>>    		slave->phy = phy_connect(priv->ndev, slave->data->phy_id,
>>> @@ -1946,7 +1946,7 @@ static int cpsw_probe_dt(struct cpsw_priv *priv,
>>>    	struct device_node *node = pdev->dev.of_node;
>>>    	struct device_node *slave_node;
>>>    	struct cpsw_platform_data *data = &priv->data;
>>> -	int i = 0, ret;
>>> +	int i, ret;
>>>    	u32 prop;
>>>    
>>>    	if (!node)
>>> @@ -1958,6 +1958,14 @@ static int cpsw_probe_dt(struct cpsw_priv *priv,
>>>    	}
>>>    	data->slaves = prop;
>>>    
>>> +	priv->slaves = devm_kzalloc(&pdev->dev,
>>> +				    sizeof(struct cpsw_slave) * data->slaves,
>>> +				    GFP_KERNEL);
>>> +	if (!priv->slaves)
>>> +		return -ENOMEM;
>>> +	for (i = 0; i < data->slaves; i++)
>>> +		priv->slaves[i].slave_num = i;
>>> +
>>>    	if (of_property_read_u32(node, "active_slave", &prop)) {
>>>    		dev_err(&pdev->dev, "Missing active_slave property in the DT.\n");
>>>    		return -EINVAL;
>>> @@ -2023,6 +2031,7 @@ static int cpsw_probe_dt(struct cpsw_priv *priv,
>>>    	if (ret)
>>>    		dev_warn(&pdev->dev, "Doesn't have any child node\n");
>>>    
>>> +	i = 0;
>>>    	for_each_child_of_node(node, slave_node) {
>>>    		struct cpsw_slave_data *slave_data = data->slave_data + i;
>>>    		const void *mac_addr = NULL;
>>> @@ -2033,7 +2042,8 @@ static int cpsw_probe_dt(struct cpsw_priv *priv,
>>>    		if (strcmp(slave_node->name, "slave"))
>>>    			continue;
>>>    
>>> -		priv->phy_node = of_parse_phandle(slave_node, "phy-handle", 0);
>>> +		priv->slaves[i].phy_node =
>>> +			of_parse_phandle(slave_node, "phy-handle", 0);
>>
>> i++?
>>
>> Ideally, the simplest way is to save phy_node in slave_data, but ...
>> (see comment below).
> 
> FYI, I have a patch [1] that does exactly that in my queue. Sorry
> I've been busy and haven't had a chance to rebase/retest/resubmit
> since Nicolas gave his Tested-By (and I missed Andrew's original
> patch). I can probably steal some time to resurrect that quickly
> if it's preferred, just let me know.
> 
> [1] http://www.spinics.net/lists/netdev/msg357772.html

Ah Ok. There are no user of cpsw_platform_data outside of net/ethernet/ti/,
so yes, looks like your patch 1 does exactly what's needed.

> 
>>
>>
>>>    		parp = of_get_property(slave_node, "phy_id", &lenp);
>>>    		if (of_phy_is_fixed_link(slave_node)) {
>>>    			struct device_node *phy_node;
>>> @@ -2292,16 +2302,6 @@ static int cpsw_probe(struct platform_device *pdev)
>>>    
>>>    	memcpy(ndev->dev_addr, priv->mac_addr, ETH_ALEN);
>>>    
>>> -	priv->slaves = devm_kzalloc(&pdev->dev,
>>> -				    sizeof(struct cpsw_slave) * data->slaves,
>>> -				    GFP_KERNEL);
>>> -	if (!priv->slaves) {
>>> -		ret = -ENOMEM;
>>> -		goto clean_runtime_disable_ret;
>>> -	}
>> I don't think you can move this out from here - it will break legacy boot :(
>>
>>
>>> -	for (i = 0; i < data->slaves; i++)
>>> -		priv->slaves[i].slave_num = i;
>>
>> Personally, I see only one safe way to do it without big rework -
>> do second pass of DT parsing here to fill phy_node field.
>>
 


-- 
regards,
-grygorii

Re: [PATCH v2 1/1] drivers: net: cpsw: Prevent NUll pointer dereference with two PHYs

[David Rivshin (Allworx)]

On Tue, 19 Apr 2016 18:44:41 +0300
Grygorii Strashko <grygorii.strashko@ti.com> wrote:

> On 04/19/2016 06:01 PM, David Rivshin (Allworx) wrote:
> > On Tue, 19 Apr 2016 17:41:07 +0300
> > Grygorii Strashko <grygorii.strashko@ti.com> wrote:
> >   
> >> Hi,
> >>
> >> On 04/19/2016 04:56 PM, Andrew Goodbody wrote:  
> >>> Adding a 2nd PHY to cpsw results in a NULL pointer dereference
> >>> as below. Fix by maintaining a reference to each PHY node in slave
> >>> struct instead of a single reference in the priv struct which was
> >>> overwritten by the 2nd PHY.  
> >>
> >> David, Is it possible to drop prev version of this patch from linux-next
> >> - it breaks boot on many TI boards with -next.
> >>
> >>  
> >>>
> >>> [   17.870933] Unable to handle kernel NULL pointer dereference at virtual address 00000180
> >>> [   17.879557] pgd = dc8bc000
> >>> [   17.882514] [00000180] *pgd=9c882831, *pte=00000000, *ppte=00000000
> >>> [   17.889213] Internal error: Oops: 17 [#1] ARM
> >>> [   17.893838] Modules linked in:
> >>> [   17.897102] CPU: 0 PID: 1657 Comm: connmand Not tainted 4.5.0-ge463dfb-dirty #11
> >>> [   17.904947] Hardware name: Cambrionix whippet
> >>> [   17.909576] task: dc859240 ti: dc968000 task.ti: dc968000
> >>> [   17.915339] PC is at phy_attached_print+0x18/0x8c
> >>> [   17.920339] LR is at phy_attached_info+0x14/0x18
> >>> [   17.925247] pc : [<c042baec>]    lr : [<c042bb74>]    psr: 600f0113
> >>> [   17.925247] sp : dc969cf8  ip : dc969d28  fp : dc969d18
> >>> [   17.937425] r10: dda7a400  r9 : 00000000  r8 : 00000000
> >>> [   17.942971] r7 : 00000001  r6 : ddb00480  r5 : ddb8cb34  r4 : 00000000
> >>> [   17.949898] r3 : c0954cc0  r2 : c09562b0  r1 : 00000000  r0 : 00000000
> >>> [   17.956829] Flags: nZCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment none
> >>> [   17.964401] Control: 10c5387d  Table: 9c8bc019  DAC: 00000051
> >>> [   17.970500] Process connmand (pid: 1657, stack limit = 0xdc968210)
> >>> [   17.977059] Stack: (0xdc969cf8 to 0xdc96a000)  
> >>
> >> [...]
> >>  
> >>> [   18.323956] [<c05e4cb8>] (inet_ioctl) from [<c055f5ac>] (sock_ioctl+0x15c/0x2d8)
> >>> [   18.331829] [<c055f450>] (sock_ioctl) from [<c010b388>] (do_vfs_ioctl+0x98/0x8d0)
> >>> [   18.339765]  r7:00008914 r6:dc8ab4c0 r5:dd257ae0 r4:beaeda20
> >>> [   18.345822] [<c010b2f0>] (do_vfs_ioctl) from [<c010bc34>] (SyS_ioctl+0x74/0x84)
> >>> [   18.353573]  r10:00000000 r9:00000011 r8:beaeda20 r7:00008914 r6:dc8ab4c0 r5:dc8ab4c0
> >>> [   18.361924]  r4:00000000
> >>> [   18.364653] [<c010bbc0>] (SyS_ioctl) from [<c00163e0>] (ret_fast_syscall+0x0/0x3c)
> >>> [   18.372682]  r9:dc968000 r8:c00165e8 r7:00000036 r6:00000002 r5:00000011 r4:00000000
> >>> [   18.380960] Code: e92dd810 e24cb010 e24dd010 e59b4004 (e5902180)
> >>> [   18.387580] ---[ end trace c80529466223f3f3 ]---  
> >>
> >> ^ Could you make it shorter and drop timestamps, pls?
> >>  
> >>>
> >>> Signed-off-by: Andrew Goodbody <andrew.goodbody@cambrionix.com>
> >>> ---
> >>>
> >>> v2 - Move allocation of memory for priv->slaves to inside cpsw_probe_dt so it
> >>>        has data->slaves initialised first which is needed to calculate size
> >>>
> >>>    drivers/net/ethernet/ti/cpsw.c | 30 +++++++++++++++---------------
> >>>    1 file changed, 15 insertions(+), 15 deletions(-)
> >>>
> >>> diff --git a/drivers/net/ethernet/ti/cpsw.c b/drivers/net/ethernet/ti/cpsw.c
> >>> index 42fdfd4..e62909c 100644
> >>> --- a/drivers/net/ethernet/ti/cpsw.c
> >>> +++ b/drivers/net/ethernet/ti/cpsw.c
> >>> @@ -349,6 +349,7 @@ struct cpsw_slave {
> >>>    	struct cpsw_slave_data		*data;
> >>>    	struct phy_device		*phy;
> >>>    	struct net_device		*ndev;
> >>> +	struct device_node		*phy_node;
> >>>    	u32				port_vlan;
> >>>    	u32				open_stat;
> >>>    };
> >>> @@ -367,7 +368,6 @@ struct cpsw_priv {
> >>>    	spinlock_t			lock;
> >>>    	struct platform_device		*pdev;
> >>>    	struct net_device		*ndev;
> >>> -	struct device_node		*phy_node;
> >>>    	struct napi_struct		napi_rx;
> >>>    	struct napi_struct		napi_tx;
> >>>    	struct device			*dev;
> >>> @@ -1148,8 +1148,8 @@ static void cpsw_slave_open(struct cpsw_slave *slave, struct cpsw_priv *priv)
> >>>    		cpsw_ale_add_mcast(priv->ale, priv->ndev->broadcast,
> >>>    				   1 << slave_port, 0, 0, ALE_MCAST_FWD_2);
> >>>    
> >>> -	if (priv->phy_node)
> >>> -		slave->phy = of_phy_connect(priv->ndev, priv->phy_node,
> >>> +	if (slave->phy_node)
> >>> +		slave->phy = of_phy_connect(priv->ndev, slave->phy_node,
> >>>    				 &cpsw_adjust_link, 0, slave->data->phy_if);
> >>>    	else
> >>>    		slave->phy = phy_connect(priv->ndev, slave->data->phy_id,
> >>> @@ -1946,7 +1946,7 @@ static int cpsw_probe_dt(struct cpsw_priv *priv,
> >>>    	struct device_node *node = pdev->dev.of_node;
> >>>    	struct device_node *slave_node;
> >>>    	struct cpsw_platform_data *data = &priv->data;
> >>> -	int i = 0, ret;
> >>> +	int i, ret;
> >>>    	u32 prop;
> >>>    
> >>>    	if (!node)
> >>> @@ -1958,6 +1958,14 @@ static int cpsw_probe_dt(struct cpsw_priv *priv,
> >>>    	}
> >>>    	data->slaves = prop;
> >>>    
> >>> +	priv->slaves = devm_kzalloc(&pdev->dev,
> >>> +				    sizeof(struct cpsw_slave) * data->slaves,
> >>> +				    GFP_KERNEL);
> >>> +	if (!priv->slaves)
> >>> +		return -ENOMEM;
> >>> +	for (i = 0; i < data->slaves; i++)
> >>> +		priv->slaves[i].slave_num = i;
> >>> +
> >>>    	if (of_property_read_u32(node, "active_slave", &prop)) {
> >>>    		dev_err(&pdev->dev, "Missing active_slave property in the DT.\n");
> >>>    		return -EINVAL;
> >>> @@ -2023,6 +2031,7 @@ static int cpsw_probe_dt(struct cpsw_priv *priv,
> >>>    	if (ret)
> >>>    		dev_warn(&pdev->dev, "Doesn't have any child node\n");
> >>>    
> >>> +	i = 0;
> >>>    	for_each_child_of_node(node, slave_node) {
> >>>    		struct cpsw_slave_data *slave_data = data->slave_data + i;
> >>>    		const void *mac_addr = NULL;
> >>> @@ -2033,7 +2042,8 @@ static int cpsw_probe_dt(struct cpsw_priv *priv,
> >>>    		if (strcmp(slave_node->name, "slave"))
> >>>    			continue;
> >>>    
> >>> -		priv->phy_node = of_parse_phandle(slave_node, "phy-handle", 0);
> >>> +		priv->slaves[i].phy_node =
> >>> +			of_parse_phandle(slave_node, "phy-handle", 0);  
> >>
> >> i++?
> >>
> >> Ideally, the simplest way is to save phy_node in slave_data, but ...
> >> (see comment below).  
> > 
> > FYI, I have a patch [1] that does exactly that in my queue. Sorry
> > I've been busy and haven't had a chance to rebase/retest/resubmit
> > since Nicolas gave his Tested-By (and I missed Andrew's original
> > patch). I can probably steal some time to resurrect that quickly
> > if it's preferred, just let me know.
> > 
> > [1] http://www.spinics.net/lists/netdev/msg357772.html  
> 
> Ah Ok. There are no user of cpsw_platform_data outside of net/ethernet/ti/,
> so yes, looks like your patch 1 does exactly what's needed.

Given that the v1 of Andrew's patch is already in Dave's net tree, and 
would obviously have many conflicts with mine, how should I proceed? 
Since you already requested Dave revert that patch, should I just wait 
for that to happen and then resubmit my series? 

Dave, Does that sound good to you? 

> 
> >   
> >>
> >>  
> >>>    		parp = of_get_property(slave_node, "phy_id", &lenp);
> >>>    		if (of_phy_is_fixed_link(slave_node)) {
> >>>    			struct device_node *phy_node;
> >>> @@ -2292,16 +2302,6 @@ static int cpsw_probe(struct platform_device *pdev)
> >>>    
> >>>    	memcpy(ndev->dev_addr, priv->mac_addr, ETH_ALEN);
> >>>    
> >>> -	priv->slaves = devm_kzalloc(&pdev->dev,
> >>> -				    sizeof(struct cpsw_slave) * data->slaves,
> >>> -				    GFP_KERNEL);
> >>> -	if (!priv->slaves) {
> >>> -		ret = -ENOMEM;
> >>> -		goto clean_runtime_disable_ret;
> >>> -	}  
> >> I don't think you can move this out from here - it will break legacy boot :(
> >>
> >>  
> >>> -	for (i = 0; i < data->slaves; i++)
> >>> -		priv->slaves[i].slave_num = i;  
> >>
> >> Personally, I see only one safe way to do it without big rework -
> >> do second pass of DT parsing here to fill phy_node field.
> >>  
>  
> 
> 

Re: [PATCH v2 1/1] drivers: net: cpsw: Prevent NUll pointer dereference with two PHYs

[Florian Fainelli]

On 19/04/16 10:14, David Rivshin (Allworx) wrote:
>> Ah Ok. There are no user of cpsw_platform_data outside of net/ethernet/ti/,
>> so yes, looks like your patch 1 does exactly what's needed.
> 
> Given that the v1 of Andrew's patch is already in Dave's net tree, and 
> would obviously have many conflicts with mine, how should I proceed? 
> Since you already requested Dave revert that patch, should I just wait 
> for that to happen and then resubmit my series? 
> 
> Dave, Does that sound good to you? 

At some point, it would be good for the cpsw driver to be moved to the
DSA subsystem, a lot of these tiny little details, like how to attach
the PHY to the internal, external, fixed MDIO bus have been solved
already using standard DT bindings. This leaves you with the fun part:
how to program your switch such that it works in response to the
networking stack sollicitations (bridge, VLAN, ethtool etc.).
-- 
Florian

Re: [PATCH v2 1/1] drivers: net: cpsw: Prevent NUll pointer dereference with two PHYs

[Grygorii Strashko]

On 04/19/2016 08:14 PM, David Rivshin (Allworx) wrote:
> On Tue, 19 Apr 2016 18:44:41 +0300
> Grygorii Strashko <grygorii.strashko@ti.com> wrote:
>
>> On 04/19/2016 06:01 PM, David Rivshin (Allworx) wrote:
>>> On Tue, 19 Apr 2016 17:41:07 +0300
>>> Grygorii Strashko <grygorii.strashko@ti.com> wrote:
>>>
>>>> Hi,
>>>>
>>>> On 04/19/2016 04:56 PM, Andrew Goodbody wrote:
>>>>> Adding a 2nd PHY to cpsw results in a NULL pointer dereference
>>>>> as below. Fix by maintaining a reference to each PHY node in slave
>>>>> struct instead of a single reference in the priv struct which was
>>>>> overwritten by the 2nd PHY.
>>>>
>>>> David, Is it possible to drop prev version of this patch from linux-next
>>>> - it breaks boot on many TI boards with -next.
>>>>
>>>>
>>>>>
>>>>> [   17.870933] Unable to handle kernel NULL pointer dereference at virtual address 00000180
>>>>> [   17.879557] pgd = dc8bc000
>>>>> [   17.882514] [00000180] *pgd=9c882831, *pte=00000000, *ppte=00000000
>>>>> [   17.889213] Internal error: Oops: 17 [#1] ARM
>>>>> [   17.893838] Modules linked in:
>>>>> [   17.897102] CPU: 0 PID: 1657 Comm: connmand Not tainted 4.5.0-ge463dfb-dirty #11
>>>>> [   17.904947] Hardware name: Cambrionix whippet
>>>>> [   17.909576] task: dc859240 ti: dc968000 task.ti: dc968000
>>>>> [   17.915339] PC is at phy_attached_print+0x18/0x8c
>>>>> [   17.920339] LR is at phy_attached_info+0x14/0x18
>>>>> [   17.925247] pc : [<c042baec>]    lr : [<c042bb74>]    psr: 600f0113
>>>>> [   17.925247] sp : dc969cf8  ip : dc969d28  fp : dc969d18
>>>>> [   17.937425] r10: dda7a400  r9 : 00000000  r8 : 00000000
>>>>> [   17.942971] r7 : 00000001  r6 : ddb00480  r5 : ddb8cb34  r4 : 00000000
>>>>> [   17.949898] r3 : c0954cc0  r2 : c09562b0  r1 : 00000000  r0 : 00000000
>>>>> [   17.956829] Flags: nZCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment none
>>>>> [   17.964401] Control: 10c5387d  Table: 9c8bc019  DAC: 00000051
>>>>> [   17.970500] Process connmand (pid: 1657, stack limit = 0xdc968210)
>>>>> [   17.977059] Stack: (0xdc969cf8 to 0xdc96a000)
>>>>
>>>> [...]
>>>>
>>>>> [   18.323956] [<c05e4cb8>] (inet_ioctl) from [<c055f5ac>] (sock_ioctl+0x15c/0x2d8)
>>>>> [   18.331829] [<c055f450>] (sock_ioctl) from [<c010b388>] (do_vfs_ioctl+0x98/0x8d0)
>>>>> [   18.339765]  r7:00008914 r6:dc8ab4c0 r5:dd257ae0 r4:beaeda20
>>>>> [   18.345822] [<c010b2f0>] (do_vfs_ioctl) from [<c010bc34>] (SyS_ioctl+0x74/0x84)
>>>>> [   18.353573]  r10:00000000 r9:00000011 r8:beaeda20 r7:00008914 r6:dc8ab4c0 r5:dc8ab4c0
>>>>> [   18.361924]  r4:00000000
>>>>> [   18.364653] [<c010bbc0>] (SyS_ioctl) from [<c00163e0>] (ret_fast_syscall+0x0/0x3c)
>>>>> [   18.372682]  r9:dc968000 r8:c00165e8 r7:00000036 r6:00000002 r5:00000011 r4:00000000
>>>>> [   18.380960] Code: e92dd810 e24cb010 e24dd010 e59b4004 (e5902180)
>>>>> [   18.387580] ---[ end trace c80529466223f3f3 ]---
>>>>
>>>> ^ Could you make it shorter and drop timestamps, pls?
>>>>
>>>>>
>>>>> Signed-off-by: Andrew Goodbody <andrew.goodbody@cambrionix.com>
>>>>> ---
>>>>>
>>>>> v2 - Move allocation of memory for priv->slaves to inside cpsw_probe_dt so it
>>>>>         has data->slaves initialised first which is needed to calculate size
>>>>>
>>>>>     drivers/net/ethernet/ti/cpsw.c | 30 +++++++++++++++---------------
>>>>>     1 file changed, 15 insertions(+), 15 deletions(-)
>>>>>
>>>>> diff --git a/drivers/net/ethernet/ti/cpsw.c b/drivers/net/ethernet/ti/cpsw.c
>>>>> index 42fdfd4..e62909c 100644
>>>>> --- a/drivers/net/ethernet/ti/cpsw.c
>>>>> +++ b/drivers/net/ethernet/ti/cpsw.c
>>>>> @@ -349,6 +349,7 @@ struct cpsw_slave {
>>>>>     	struct cpsw_slave_data		*data;
>>>>>     	struct phy_device		*phy;
>>>>>     	struct net_device		*ndev;
>>>>> +	struct device_node		*phy_node;
>>>>>     	u32				port_vlan;
>>>>>     	u32				open_stat;
>>>>>     };
>>>>> @@ -367,7 +368,6 @@ struct cpsw_priv {
>>>>>     	spinlock_t			lock;
>>>>>     	struct platform_device		*pdev;
>>>>>     	struct net_device		*ndev;
>>>>> -	struct device_node		*phy_node;
>>>>>     	struct napi_struct		napi_rx;
>>>>>     	struct napi_struct		napi_tx;
>>>>>     	struct device			*dev;
>>>>> @@ -1148,8 +1148,8 @@ static void cpsw_slave_open(struct cpsw_slave *slave, struct cpsw_priv *priv)
>>>>>     		cpsw_ale_add_mcast(priv->ale, priv->ndev->broadcast,
>>>>>     				   1 << slave_port, 0, 0, ALE_MCAST_FWD_2);
>>>>>
>>>>> -	if (priv->phy_node)
>>>>> -		slave->phy = of_phy_connect(priv->ndev, priv->phy_node,
>>>>> +	if (slave->phy_node)
>>>>> +		slave->phy = of_phy_connect(priv->ndev, slave->phy_node,
>>>>>     				 &cpsw_adjust_link, 0, slave->data->phy_if);
>>>>>     	else
>>>>>     		slave->phy = phy_connect(priv->ndev, slave->data->phy_id,
>>>>> @@ -1946,7 +1946,7 @@ static int cpsw_probe_dt(struct cpsw_priv *priv,
>>>>>     	struct device_node *node = pdev->dev.of_node;
>>>>>     	struct device_node *slave_node;
>>>>>     	struct cpsw_platform_data *data = &priv->data;
>>>>> -	int i = 0, ret;
>>>>> +	int i, ret;
>>>>>     	u32 prop;
>>>>>
>>>>>     	if (!node)
>>>>> @@ -1958,6 +1958,14 @@ static int cpsw_probe_dt(struct cpsw_priv *priv,
>>>>>     	}
>>>>>     	data->slaves = prop;
>>>>>
>>>>> +	priv->slaves = devm_kzalloc(&pdev->dev,
>>>>> +				    sizeof(struct cpsw_slave) * data->slaves,
>>>>> +				    GFP_KERNEL);
>>>>> +	if (!priv->slaves)
>>>>> +		return -ENOMEM;
>>>>> +	for (i = 0; i < data->slaves; i++)
>>>>> +		priv->slaves[i].slave_num = i;
>>>>> +
>>>>>     	if (of_property_read_u32(node, "active_slave", &prop)) {
>>>>>     		dev_err(&pdev->dev, "Missing active_slave property in the DT.\n");
>>>>>     		return -EINVAL;
>>>>> @@ -2023,6 +2031,7 @@ static int cpsw_probe_dt(struct cpsw_priv *priv,
>>>>>     	if (ret)
>>>>>     		dev_warn(&pdev->dev, "Doesn't have any child node\n");
>>>>>
>>>>> +	i = 0;
>>>>>     	for_each_child_of_node(node, slave_node) {
>>>>>     		struct cpsw_slave_data *slave_data = data->slave_data + i;
>>>>>     		const void *mac_addr = NULL;
>>>>> @@ -2033,7 +2042,8 @@ static int cpsw_probe_dt(struct cpsw_priv *priv,
>>>>>     		if (strcmp(slave_node->name, "slave"))
>>>>>     			continue;
>>>>>
>>>>> -		priv->phy_node = of_parse_phandle(slave_node, "phy-handle", 0);
>>>>> +		priv->slaves[i].phy_node =
>>>>> +			of_parse_phandle(slave_node, "phy-handle", 0);
>>>>
>>>> i++?
>>>>
>>>> Ideally, the simplest way is to save phy_node in slave_data, but ...
>>>> (see comment below).
>>>
>>> FYI, I have a patch [1] that does exactly that in my queue. Sorry
>>> I've been busy and haven't had a chance to rebase/retest/resubmit
>>> since Nicolas gave his Tested-By (and I missed Andrew's original
>>> patch). I can probably steal some time to resurrect that quickly
>>> if it's preferred, just let me know.
>>>
>>> [1] http://www.spinics.net/lists/netdev/msg357772.html
>>
>> Ah Ok. There are no user of cpsw_platform_data outside of net/ethernet/ti/,
>> so yes, looks like your patch 1 does exactly what's needed.
>
> Given that the v1 of Andrew's patch is already in Dave's net tree, and
> would obviously have many conflicts with mine, how should I proceed?
> Since you already requested Dave revert that patch, should I just wait
> for that to happen and then resubmit my series?
>
> Dave, Does that sound good to you?
>

May be you can send revert + your patch 1 (only fix for this issue).


Dave, Does that sound good to you?

-- 
regards,
-grygorii

Re: [PATCH v2 1/1] drivers: net: cpsw: Prevent NUll pointer dereference with two PHYs

[David Miller]

From: Grygorii Strashko <grygorii.strashko@ti.com>
Date: Tue, 19 Apr 2016 21:44:09 +0300

> May be you can send revert + your patch 1 (only fix for this issue).
> 
> Dave, Does that sound good to you?

Sure.

Re: [PATCH v2 1/1] drivers: net: cpsw: Prevent NUll pointer dereference with two PHYs

[David Rivshin (Allworx)]

On Tue, 19 Apr 2016 18:43:39 -0400 (EDT)
David Miller <davem@davemloft.net> wrote:

> From: Grygorii Strashko <grygorii.strashko@ti.com>
> Date: Tue, 19 Apr 2016 21:44:09 +0300
> 
> > May be you can send revert + your patch 1 (only fix for this issue).
> > 
> > Dave, Does that sound good to you?  
> 
> Sure.

OK, I will hopefully have that ready tomorrow evening.

Anything in particular I should mention in the revert commit message?
I didn't find a discussion on it, other than the earlier statement that 
"it breaks boot on many TI boards".

Re: [PATCH v2 1/1] drivers: net: cpsw: Prevent NUll pointer dereference with two PHYs

[Grygorii Strashko]

On 04/20/2016 02:38 AM, David Rivshin (Allworx) wrote:
> On Tue, 19 Apr 2016 18:43:39 -0400 (EDT)
> David Miller <davem@davemloft.net> wrote:
> 
>> From: Grygorii Strashko <grygorii.strashko@ti.com>
>> Date: Tue, 19 Apr 2016 21:44:09 +0300
>>
>>> May be you can send revert + your patch 1 (only fix for this issue).
>>>
>>> Dave, Does that sound good to you?
>>
>> Sure.
> 
> OK, I will hopefully have that ready tomorrow evening.
> 
> Anything in particular I should mention in the revert commit message?
> I didn't find a discussion on it, other than the earlier statement that
> "it breaks boot on many TI boards".
> 

Such kind of issues are tracked automatically now for ARM through https://kernelci.org
Example:
https://storage.kernelci.org/next/next-20160419/arm-multi_v7_defconfig+CONFIG_EFI=y/lab-cambridge/boot-am335x-boneblack.txt

And We're trying to auto check it internally also
https://github.com/nmenon/kernel-test-logs

Below is my boot log:


 ata1: SATA max UDMA/133 mmio [mem 0x4a140000-0x4a1410ff] port 0x100 irq 332
 mtdoops: mtd device (mtddev=name/number) must be supplied
 davinci_mdio 48485000.mdio: davinci mdio revision 1.6
 davinci_mdio 48485000.mdio: detected phy mask fffffff9
 libphy: 48485000.mdio: probed
 davinci_mdio 48485000.mdio: phy[1]: device 48485000.mdio:01, driver unknown
 davinci_mdio 48485000.mdio: phy[2]: device 48485000.mdio:02, driver unknown
 cpsw 48484000.ethernet: Detected MACID = 74:da:ea:47:7d:9c
 cpsw 48484000.ethernet: cpsw: Random MACID = ca:39:e7:f3:28:69
 Unable to handle kernel paging request at virtual address fffffffc
 pgd = c0004000
 [fffffffc] *pgd=affae861, *pte=00000000, *ppte=00000000
 Internal error: Oops: 37 [#1] SMP ARM
 Modules linked in:
 CPU: 1 PID: 1 Comm: swapper/0 Tainted: G        W       4.6.0-rc4-next-20160419-00002-g94c3d2a #4
 Hardware name: Generic DRA74X (Flattened Device Tree)
 task: ee0c4d80 ti: ee0c6000 task.ti: ee0c6000
 PC is at kset_find_obj+0x28/0xa4
 LR is at kset_find_obj+0x3c/0xa4
 pc : [<c04814b4>]    lr : [<c04814c8>]    psr: a0000013
 sp : ee0c7ec8  ip : 00000000  fp : c0b005a0
 
 [<c04814b4>] (kset_find_obj) from [<c0523780>] (driver_find+0x14/0x30)
 ata1: SATA link down (SStatus 0 SControl 300)
 [<c0523780>] (driver_find) from [<c0523804>] (driver_register+0x68/0xf8)
 [<c0523804>] (driver_register) from [<c010185c>] (do_one_initcall+0x3c/0x178)
 [<c010185c>] (do_one_initcall) from [<c0b00e94>] (kernel_init_freeable+0x218/0x2e8)
 [<c0b00e94>] (kernel_init_freeable) from [<c07a4bc8>] (kernel_init+0x8/0x118)
 [<c07a4bc8>] (kernel_init) from [<c01078d0>] (ret_from_fork+0x14/0x24)
 Code: e5954000 e1550004 e2444004 0a00000a (e5943000) 
 ---[ end trace 593c492662ed437e ]---
 Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b
 
 CPU0: stopping
 CPU: 0 PID: 0 Comm: swapper/0 Tainted: G      D W       4.6.0-rc4-next-20160419-00002-g94c3d2a #4
 Hardware name: Generic DRA74X (Flattened Device Tree)
 [<c01101dc>] (unwind_backtrace) from [<c010c2a4>] (show_stack+0x10/0x14)
 [<c010c2a4>] (show_stack) from [<c047f01c>] (dump_stack+0xb0/0xe4)
 [<c047f01c>] (dump_stack) from [<c010e7cc>] (handle_IPI+0x2c4/0x360)
 [<c010e7cc>] (handle_IPI) from [<c0101574>] (gic_handle_irq+0x84/0x94)
 [<c0101574>] (gic_handle_irq) from [<c07abc78>] (__irq_svc+0x58/0x78)
 Exception stack(0xc0c01f58 to 0xc0c01fa0)
 1f40:                                                       c0108318 00000000
 1f60: 00000000 00000000 c0c02a34 00000000 00000000 c0cbe5f8 c0c029cc c0cbe5f8
 1f80: c0b71a38 c0cbd3a9 00000000 c0c01fa8 c0108318 c010831c 60000013 ffffffff
 [<c07abc78>] (__irq_svc) from [<c010831c>] (arch_cpu_idle+0x20/0x3c)
 [<c010831c>] (arch_cpu_idle) from [<c0184c58>] (cpu_startup_entry+0x30c/0x3f0)
 [<c0184c58>] (cpu_startup_entry) from [<c0b00c04>] (start_kernel+0x33c/0x3b4)
 [<c0b00c04>] (start_kernel) from [<8000807c>] (0x8000807c)


-- 
regards,
-grygorii

Re: [PATCH v2 1/1] drivers: net: cpsw: Prevent NUll pointer dereference with two PHYs

[David Miller]

From: Grygorii Strashko <grygorii.strashko@ti.com>
Date: Tue, 19 Apr 2016 17:41:07 +0300

> David, Is it possible to drop prev version of this patch from linux-next
> - it breaks boot on many TI boards with -next.

It doesn't work that way, I cannot "drop" patches.

One has to send me a fix to the existing patch, or a revert.

[PATCH v2 0/1] drivers: net: cpsw: Fix NULL pointer dereference with two slave PHYs

[Andrew Goodbody]

This is a fix for a NULL pointer dereference from cpsw which is triggered
by having two slave PHYs attached to a cpsw network device. The problem is
due to only maintaining a single reference to a PHY node in the prive data
which gets overwritten by the second PHY probe. So move the PHY node
reference to the individual slave data so that there is now one per slave.

v1 had a problem that data->slaves was used before it had been filled in

Andrew Goodbody (1):
  Prevent NUll pointer dereference with two PHYs on cpsw

 drivers/net/ethernet/ti/cpsw.c | 30 +++++++++++++++---------------
 1 file changed, 15 insertions(+), 15 deletions(-)

-- 
2.5.0

[PATCH v2 1/1] drivers: net: cpsw: Prevent NUll pointer dereference with two PHYs

[Andrew Goodbody]

Adding a 2nd PHY to cpsw results in a NULL pointer dereference
as below. Fix by maintaining a reference to each PHY node in slave
struct instead of a single reference in the priv struct which was
overwritten by the 2nd PHY.

[   17.870933] Unable to handle kernel NULL pointer dereference at virtual address 00000180
[   17.879557] pgd = dc8bc000
[   17.882514] [00000180] *pgd=9c882831, *pte=00000000, *ppte=00000000
[   17.889213] Internal error: Oops: 17 [#1] ARM
[   17.893838] Modules linked in:
[   17.897102] CPU: 0 PID: 1657 Comm: connmand Not tainted 4.5.0-ge463dfb-dirty #11
[   17.904947] Hardware name: Cambrionix whippet
[   17.909576] task: dc859240 ti: dc968000 task.ti: dc968000
[   17.915339] PC is at phy_attached_print+0x18/0x8c
[   17.920339] LR is at phy_attached_info+0x14/0x18
[   17.925247] pc : [<c042baec>]    lr : [<c042bb74>]    psr: 600f0113
[   17.925247] sp : dc969cf8  ip : dc969d28  fp : dc969d18
[   17.937425] r10: dda7a400  r9 : 00000000  r8 : 00000000
[   17.942971] r7 : 00000001  r6 : ddb00480  r5 : ddb8cb34  r4 : 00000000
[   17.949898] r3 : c0954cc0  r2 : c09562b0  r1 : 00000000  r0 : 00000000
[   17.956829] Flags: nZCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment none
[   17.964401] Control: 10c5387d  Table: 9c8bc019  DAC: 00000051
[   17.970500] Process connmand (pid: 1657, stack limit = 0xdc968210)
[   17.977059] Stack: (0xdc969cf8 to 0xdc96a000)
[   17.981692] 9ce0:                                                       dc969d28 dc969d08
[   17.990386] 9d00: c038f9bc c038f6b4 ddb00480 dc969d34 dc969d28 c042bb74 c042bae4 00000000
[   17.999080] 9d20: c09562b0 c0954cc0 dc969d5c dc969d38 c043ebfc c042bb6c 00000007 00000003
[   18.007773] 9d40: ddb00000 ddb8cb58 ddb00480 00000001 dc969dec dc969d60 c0441614 c043ea68
[   18.016465] 9d60: 00000000 00000003 00000000 fffffff4 dc969df4 0000000d 00000000 00000000
[   18.025159] 9d80: dc969db4 dc969d90 c005dc08 c05839e0 dc969df4 0000000d ddb00000 00001002
[   18.033851] 9da0: 00000000 00000000 dc969dcc dc969db8 c005ddf4 c005dbc8 00000000 00000118
[   18.042544] 9dc0: dc969dec dc969dd0 ddb00000 c06db27c ffff9003 00001002 00000000 00000000
[   18.051237] 9de0: dc969e0c dc969df0 c057c88c c04410dc dc969e0c ddb00000 ddb00000 00000001
[   18.059930] 9e00: dc969e34 dc969e10 c057cb44 c057c7d8 ddb00000 ddb00138 00001002 beaeda20
[   18.068622] 9e20: 00000000 00000000 dc969e5c dc969e38 c057cc28 c057cac0 00000000 dc969e80
[   18.077315] 9e40: dda7a40c beaeda20 00000000 00000000 dc969ecc dc969e60 c05e36d0 c057cc14
[   18.086007] 9e60: dc969e84 00000051 beaeda20 00000000 dda7a40c 00000014 ddb00000 00008914
[   18.094699] 9e80: 30687465 00000000 00000000 00000000 00009003 00000000 00000000 00000000
[   18.103391] 9ea0: 00001002 00008914 dd257ae0 beaeda20 c098a428 beaeda20 00000011 00000000
[   18.112084] 9ec0: dc969edc dc969ed0 c05e4e54 c05e3030 dc969efc dc969ee0 c055f5ac c05e4cc4
[   18.120777] 9ee0: beaeda20 dd257ae0 dc8ab4c0 00008914 dc969f7c dc969f00 c010b388 c055f45c
[   18.129471] 9f00: c071ca40 dd257ac0 c00165e8 dc968000 dc969f3c dc969f20 dc969f64 dc969f28
[   18.138164] 9f20: c0115708 c0683ec8 dd257ac0 dd257ac0 dc969f74 dc969f40 c055f350 c00fc66c
[   18.146857] 9f40: dd82e4d0 00000011 00000000 00080000 dd257ac0 00000000 dc8ab4c0 dc8ab4c0
[   18.155550] 9f60: 00008914 beaeda20 00000011 00000000 dc969fa4 dc969f80 c010bc34 c010b2fc
[   18.164242] 9f80: 00000000 00000011 00000002 00000036 c00165e8 dc968000 00000000 dc969fa8
[   18.172935] 9fa0: c00163e0 c010bbcc 00000000 00000011 00000011 00008914 beaeda20 00009003
[   18.181628] 9fc0: 00000000 00000011 00000002 00000036 00081018 00000001 00000000 beaedc10
[   18.190320] 9fe0: 00083188 beaeda1c 00043a5d b6d29c0c 600b0010 00000011 00000000 00000000
[   18.198989] Backtrace:
[   18.201621] [<c042bad8>] (phy_attached_print) from [<c042bb74>] (phy_attached_info+0x14/0x18)
[   18.210664]  r3:c0954cc0 r2:c09562b0 r1:00000000
[   18.215588]  r4:ddb00480
[   18.218322] [<c042bb60>] (phy_attached_info) from [<c043ebfc>] (cpsw_slave_open+0x1a0/0x280)
[   18.227293] [<c043ea5c>] (cpsw_slave_open) from [<c0441614>] (cpsw_ndo_open+0x544/0x674)
[   18.235874]  r7:00000001 r6:ddb00480 r5:ddb8cb58 r4:ddb00000
[   18.241944] [<c04410d0>] (cpsw_ndo_open) from [<c057c88c>] (__dev_open+0xc0/0x128)
[   18.249972]  r9:00000000 r8:00000000 r7:00001002 r6:ffff9003 r5:c06db27c r4:ddb00000
[   18.258255] [<c057c7cc>] (__dev_open) from [<c057cb44>] (__dev_change_flags+0x90/0x154)
[   18.266745]  r5:00000001 r4:ddb00000
[   18.270575] [<c057cab4>] (__dev_change_flags) from [<c057cc28>] (dev_change_flags+0x20/0x50)
[   18.279523]  r9:00000000 r8:00000000 r7:beaeda20 r6:00001002 r5:ddb00138 r4:ddb00000
[   18.287811] [<c057cc08>] (dev_change_flags) from [<c05e36d0>] (devinet_ioctl+0x6ac/0x76c)
[   18.296483]  r9:00000000 r8:00000000 r7:beaeda20 r6:dda7a40c r5:dc969e80 r4:00000000
[   18.304762] [<c05e3024>] (devinet_ioctl) from [<c05e4e54>] (inet_ioctl+0x19c/0x1c8)
[   18.312882]  r10:00000000 r9:00000011 r8:beaeda20 r7:c098a428 r6:beaeda20 r5:dd257ae0
[   18.321235]  r4:00008914
[   18.323956] [<c05e4cb8>] (inet_ioctl) from [<c055f5ac>] (sock_ioctl+0x15c/0x2d8)
[   18.331829] [<c055f450>] (sock_ioctl) from [<c010b388>] (do_vfs_ioctl+0x98/0x8d0)
[   18.339765]  r7:00008914 r6:dc8ab4c0 r5:dd257ae0 r4:beaeda20
[   18.345822] [<c010b2f0>] (do_vfs_ioctl) from [<c010bc34>] (SyS_ioctl+0x74/0x84)
[   18.353573]  r10:00000000 r9:00000011 r8:beaeda20 r7:00008914 r6:dc8ab4c0 r5:dc8ab4c0
[   18.361924]  r4:00000000
[   18.364653] [<c010bbc0>] (SyS_ioctl) from [<c00163e0>] (ret_fast_syscall+0x0/0x3c)
[   18.372682]  r9:dc968000 r8:c00165e8 r7:00000036 r6:00000002 r5:00000011 r4:00000000
[   18.380960] Code: e92dd810 e24cb010 e24dd010 e59b4004 (e5902180)
[   18.387580] ---[ end trace c80529466223f3f3 ]---

Signed-off-by: Andrew Goodbody <andrew.goodbody@cambrionix.com>
---

v2 - Move allocation of memory for priv->slaves to inside cpsw_probe_dt so it
     has data->slaves initialised first which is needed to calculate size

 drivers/net/ethernet/ti/cpsw.c | 30 +++++++++++++++---------------
 1 file changed, 15 insertions(+), 15 deletions(-)

diff --git a/drivers/net/ethernet/ti/cpsw.c b/drivers/net/ethernet/ti/cpsw.c
index 42fdfd4..e62909c 100644
--- a/drivers/net/ethernet/ti/cpsw.c
+++ b/drivers/net/ethernet/ti/cpsw.c
@@ -349,6 +349,7 @@ struct cpsw_slave {
 	struct cpsw_slave_data		*data;
 	struct phy_device		*phy;
 	struct net_device		*ndev;
+	struct device_node		*phy_node;
 	u32				port_vlan;
 	u32				open_stat;
 };
@@ -367,7 +368,6 @@ struct cpsw_priv {
 	spinlock_t			lock;
 	struct platform_device		*pdev;
 	struct net_device		*ndev;
-	struct device_node		*phy_node;
 	struct napi_struct		napi_rx;
 	struct napi_struct		napi_tx;
 	struct device			*dev;
@@ -1148,8 +1148,8 @@ static void cpsw_slave_open(struct cpsw_slave *slave, struct cpsw_priv *priv)
 		cpsw_ale_add_mcast(priv->ale, priv->ndev->broadcast,
 				   1 << slave_port, 0, 0, ALE_MCAST_FWD_2);
 
-	if (priv->phy_node)
-		slave->phy = of_phy_connect(priv->ndev, priv->phy_node,
+	if (slave->phy_node)
+		slave->phy = of_phy_connect(priv->ndev, slave->phy_node,
 				 &cpsw_adjust_link, 0, slave->data->phy_if);
 	else
 		slave->phy = phy_connect(priv->ndev, slave->data->phy_id,
@@ -1946,7 +1946,7 @@ static int cpsw_probe_dt(struct cpsw_priv *priv,
 	struct device_node *node = pdev->dev.of_node;
 	struct device_node *slave_node;
 	struct cpsw_platform_data *data = &priv->data;
-	int i = 0, ret;
+	int i, ret;
 	u32 prop;
 
 	if (!node)
@@ -1958,6 +1958,14 @@ static int cpsw_probe_dt(struct cpsw_priv *priv,
 	}
 	data->slaves = prop;
 
+	priv->slaves = devm_kzalloc(&pdev->dev,
+				    sizeof(struct cpsw_slave) * data->slaves,
+				    GFP_KERNEL);
+	if (!priv->slaves)
+		return -ENOMEM;
+	for (i = 0; i < data->slaves; i++)
+		priv->slaves[i].slave_num = i;
+
 	if (of_property_read_u32(node, "active_slave", &prop)) {
 		dev_err(&pdev->dev, "Missing active_slave property in the DT.\n");
 		return -EINVAL;
@@ -2023,6 +2031,7 @@ static int cpsw_probe_dt(struct cpsw_priv *priv,
 	if (ret)
 		dev_warn(&pdev->dev, "Doesn't have any child node\n");
 
+	i = 0;
 	for_each_child_of_node(node, slave_node) {
 		struct cpsw_slave_data *slave_data = data->slave_data + i;
 		const void *mac_addr = NULL;
@@ -2033,7 +2042,8 @@ static int cpsw_probe_dt(struct cpsw_priv *priv,
 		if (strcmp(slave_node->name, "slave"))
 			continue;
 
-		priv->phy_node = of_parse_phandle(slave_node, "phy-handle", 0);
+		priv->slaves[i].phy_node =
+			of_parse_phandle(slave_node, "phy-handle", 0);
 		parp = of_get_property(slave_node, "phy_id", &lenp);
 		if (of_phy_is_fixed_link(slave_node)) {
 			struct device_node *phy_node;
@@ -2292,16 +2302,6 @@ static int cpsw_probe(struct platform_device *pdev)
 
 	memcpy(ndev->dev_addr, priv->mac_addr, ETH_ALEN);
 
-	priv->slaves = devm_kzalloc(&pdev->dev,
-				    sizeof(struct cpsw_slave) * data->slaves,
-				    GFP_KERNEL);
-	if (!priv->slaves) {
-		ret = -ENOMEM;
-		goto clean_runtime_disable_ret;
-	}
-	for (i = 0; i < data->slaves; i++)
-		priv->slaves[i].slave_num = i;
-
 	priv->slaves[0].ndev = ndev;
 	priv->emac_port = 0;
 
-- 
2.5.0