[net-next PATCH 1/1] drivers: net: cpsw: fix kernel warn on cpsw irq enable

[net-next PATCH 1/1] drivers: net: cpsw: fix kernel warn on cpsw irq enable

[Mugunthan V N]

With the commit id a11fbba from Sebastian Siewior, a kernel warning is
generated as below. This warning is generated as the irq_enabled is not
initialized for the primary interface and in probe it is initialized for
the secondary interface. This patch moves irq_enabled initialization from
second interface to primary interface.

[    3.049173] net eth0: phy found : id is : 0x4dd074
[    3.054552] net eth0: phy found : id is : 0x4dd074
[    3.070421] ------------[ cut here ]------------
[    3.075308] WARNING: at kernel/irq/manage.c:437 enable_irq+0x3c/0x74()
[    3.082173] Unbalanced enable for IRQ 56
[    3.086299] Modules linked in:
[    3.089557] [<c001abcc>] (unwind_backtrace+0x0/0xf0) from [<c004294c>] (warn_slowpath_common+0x4c/0x68)
[    3.099450] [<c004294c>] (warn_slowpath_common+0x4c/0x68) from [<c00429fc>] (warn_slowpath_fmt+0x30/0x40)
[    3.109521] [<c00429fc>] (warn_slowpath_fmt+0x30/0x40) from [<c00a29fc>] (enable_irq+0x3c/0x74)
[    3.118681] [<c00a29fc>] (enable_irq+0x3c/0x74) from [<c03a7818>] (cpsw_ndo_open+0x61c/0x684)
[    3.127669] [<c03a7818>] (cpsw_ndo_open+0x61c/0x684) from [<c0445c08>] (__dev_open+0x9c/0xf8)
[    3.136646] [<c0445c08>] (__dev_open+0x9c/0xf8) from [<c0445e34>] (__dev_change_flags+0x78/0x13c)
[    3.145988] [<c0445e34>] (__dev_change_flags+0x78/0x13c) from [<c0445f64>] (dev_change_flags+0x10/0x48)
[    3.155884] [<c0445f64>] (dev_change_flags+0x10/0x48) from [<c0736d88>] (ip_auto_config+0x198/0x111c)
[    3.165592] [<c0736d88>] (ip_auto_config+0x198/0x111c) from [<c00086a4>] (do_one_initcall+0x34/0x180)
[    3.175309] [<c00086a4>] (do_one_initcall+0x34/0x180) from [<c07078f8>] (kernel_init_freeable+0xfc/0x1c8)
[    3.185393] [<c07078f8>] (kernel_init_freeable+0xfc/0x1c8) from [<c04f36ec>] (kernel_init+0x8/0xe4)
[    3.194929] [<c04f36ec>] (kernel_init+0x8/0xe4) from [<c00133d0>] (ret_from_fork+0x14/0x24)
[    3.203712] ---[ end trace d6f979da080bc391 ]---

Cc: Sebastian Siewior <bigeasy@linutronix.de>
Signed-off-by: Mugunthan V N <mugunthanvnm@ti.com>
---
 drivers/net/ethernet/ti/cpsw.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/ti/cpsw.c b/drivers/net/ethernet/ti/cpsw.c
index 4e2d224..59c4391 100644
--- a/drivers/net/ethernet/ti/cpsw.c
+++ b/drivers/net/ethernet/ti/cpsw.c
@@ -1633,7 +1633,6 @@ static int cpsw_probe_dual_emac(struct platform_device *pdev,
 		priv_sl2->irqs_table[i] = priv->irqs_table[i];
 		priv_sl2->num_irqs = priv->num_irqs;
 	}
-	priv->irq_enabled = true;
 	ndev->features |= NETIF_F_HW_VLAN_CTAG_FILTER;
 
 	ndev->netdev_ops = &cpsw_netdev_ops;
@@ -1679,6 +1678,7 @@ static int cpsw_probe(struct platform_device *pdev)
 	priv->msg_enable = netif_msg_init(debug_level, CPSW_DEBUG);
 	priv->rx_packet_max = max(rx_packet_max, 128);
 	priv->cpts = devm_kzalloc(&pdev->dev, sizeof(struct cpts), GFP_KERNEL);
+	priv->irq_enabled = true;
 	if (!ndev) {
 		pr_err("error allocating cpts\n");
 		goto clean_ndev_ret;
-- 
1.7.9.5

Re: [net-next PATCH 1/1] drivers: net: cpsw: fix kernel warn on cpsw irq enable

[Sebastian Andrzej Siewior]

On 04/26/2013 01:30 PM, Mugunthan V N wrote:
> diff --git a/drivers/net/ethernet/ti/cpsw.c b/drivers/net/ethernet/ti/cpsw.c
> index 4e2d224..59c4391 100644
> --- a/drivers/net/ethernet/ti/cpsw.c
> +++ b/drivers/net/ethernet/ti/cpsw.c
> @@ -1633,7 +1633,6 @@ static int cpsw_probe_dual_emac(struct platform_device *pdev,
>  		priv_sl2->irqs_table[i] = priv->irqs_table[i];
>  		priv_sl2->num_irqs = priv->num_irqs;
>  	}
> -	priv->irq_enabled = true;
>  	ndev->features |= NETIF_F_HW_VLAN_CTAG_FILTER;
>  
>  	ndev->netdev_ops = &cpsw_netdev_ops;
> @@ -1679,6 +1678,7 @@ static int cpsw_probe(struct platform_device *pdev)
>  	priv->msg_enable = netif_msg_init(debug_level, CPSW_DEBUG);
>  	priv->rx_packet_max = max(rx_packet_max, 128);
>  	priv->cpts = devm_kzalloc(&pdev->dev, sizeof(struct cpts), GFP_KERNEL);
> +	priv->irq_enabled = true;
>  	if (!ndev) {
>  		pr_err("error allocating cpts\n");
>  		goto clean_ndev_ret;


David, how did this happen? The patch I've sent

   http://www.spinics.net/lists/netdev/msg234240.html

adds this to the probe function, according to the net-next tree it was
added to cpsw_probe_dual_emac(). The context is similar but not exact
the same.

Sebastian

Re: [net-next PATCH 1/1] drivers: net: cpsw: fix kernel warn on cpsw irq enable

[David Miller]

From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Fri, 26 Apr 2013 14:03:24 +0200

> David, how did this happen? The patch I've sent
> 
>    http://www.spinics.net/lists/netdev/msg234240.html
> 
> adds this to the probe function, according to the net-next tree it was
> added to cpsw_probe_dual_emac(). The context is similar but not exact
> the same.

This is usually I ask people to respin patches even if there are minor
fuzz differences when I try to apply this patch.

I tried to be nice and save you some work this time, 'patch' accepted
it with minor offsets, and with a cursory glance I didn't see any
problems.

Next time I'll be a hardliner and request a respin :-)

Re: [net-next PATCH 1/1] drivers: net: cpsw: fix kernel warn on cpsw irq enable

[Sergei Shtylyov]

Hello.

On 26-04-2013 15:30, Mugunthan V N wrote:

> With the commit id a11fbba

    Please also specify that commit's summary line in parens.

> from Sebastian Siewior, a kernel warning is
> generated as below. This warning is generated as the irq_enabled is not
> initialized for the primary interface and in probe it is initialized for
> the secondary interface. This patch moves irq_enabled initialization from
> second interface to primary interface.

    s/second/secondary/?

> [    3.049173] net eth0: phy found : id is : 0x4dd074
> [    3.054552] net eth0: phy found : id is : 0x4dd074
> [    3.070421] ------------[ cut here ]------------
> [    3.075308] WARNING: at kernel/irq/manage.c:437 enable_irq+0x3c/0x74()
> [    3.082173] Unbalanced enable for IRQ 56
> [    3.086299] Modules linked in:
> [    3.089557] [<c001abcc>] (unwind_backtrace+0x0/0xf0) from [<c004294c>] (warn_slowpath_common+0x4c/0x68)
> [    3.099450] [<c004294c>] (warn_slowpath_common+0x4c/0x68) from [<c00429fc>] (warn_slowpath_fmt+0x30/0x40)
> [    3.109521] [<c00429fc>] (warn_slowpath_fmt+0x30/0x40) from [<c00a29fc>] (enable_irq+0x3c/0x74)
> [    3.118681] [<c00a29fc>] (enable_irq+0x3c/0x74) from [<c03a7818>] (cpsw_ndo_open+0x61c/0x684)
> [    3.127669] [<c03a7818>] (cpsw_ndo_open+0x61c/0x684) from [<c0445c08>] (__dev_open+0x9c/0xf8)
> [    3.136646] [<c0445c08>] (__dev_open+0x9c/0xf8) from [<c0445e34>] (__dev_change_flags+0x78/0x13c)
> [    3.145988] [<c0445e34>] (__dev_change_flags+0x78/0x13c) from [<c0445f64>] (dev_change_flags+0x10/0x48)
> [    3.155884] [<c0445f64>] (dev_change_flags+0x10/0x48) from [<c0736d88>] (ip_auto_config+0x198/0x111c)
> [    3.165592] [<c0736d88>] (ip_auto_config+0x198/0x111c) from [<c00086a4>] (do_one_initcall+0x34/0x180)
> [    3.175309] [<c00086a4>] (do_one_initcall+0x34/0x180) from [<c07078f8>] (kernel_init_freeable+0xfc/0x1c8)
> [    3.185393] [<c07078f8>] (kernel_init_freeable+0xfc/0x1c8) from [<c04f36ec>] (kernel_init+0x8/0xe4)
> [    3.194929] [<c04f36ec>] (kernel_init+0x8/0xe4) from [<c00133d0>] (ret_from_fork+0x14/0x24)
> [    3.203712] ---[ end trace d6f979da080bc391 ]---

> Cc: Sebastian Siewior <bigeasy@linutronix.de>
> Signed-off-by: Mugunthan V N <mugunthanvnm@ti.com>

WBR, Sergei