[PATCH] can: pcan_usb: don't provide CAN FD bittimings by non-FD adapters

[PATCH] can: pcan_usb: don't provide CAN FD bittimings by non-FD adapters

[Oliver Hartkopp]

The CAN FD data bittiming constants are provided via netlink only when there
are valid CAN FD constants available in priv->data_bittiming_const.

Due to the indirection of pointer assignments in the peak_usb driver the
priv->data_bittiming_const never becomes NULL - not even for non-FD adapters.

The data_bittiming_const points to zero'ed data which leads to this result
when running 'ip -details link show can0':

35: can0: <NOARP,ECHO> mtu 16 qdisc noop state DOWN mode DEFAULT group default qlen 10
    link/can  promiscuity 0
    can state STOPPED restart-ms 0
	  pcan_usb: tseg1 1..16 tseg2 1..8 sjw 1..4 brp 1..64 brp-inc 1
	  : dtseg1 0..0 dtseg2 0..0 dsjw 1..0 dbrp 0..0 dbrp-inc 0  <== BROKEN!
	  clock 8000000

This patch sets the dev_set_data_bittiming in struct peak_adapter to NULL to
be able to disable the CAN FD specific information on non-FD adapters.

Relevant for stable kernels 4.0+

Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net>
---
 drivers/net/can/usb/peak_usb/pcan_usb.c      | 1 +
 drivers/net/can/usb/peak_usb/pcan_usb_core.c | 9 +++++++--
 drivers/net/can/usb/peak_usb/pcan_usb_pro.c  | 1 +
 3 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/drivers/net/can/usb/peak_usb/pcan_usb.c b/drivers/net/can/usb/peak_usb/pcan_usb.c
index 6b94007..5c4b270 100644
--- a/drivers/net/can/usb/peak_usb/pcan_usb.c
+++ b/drivers/net/can/usb/peak_usb/pcan_usb.c
@@ -896,6 +896,7 @@ const struct peak_usb_adapter pcan_usb = {
 	.dev_init = pcan_usb_init,
 	.dev_set_bus = pcan_usb_write_mode,
 	.dev_set_bittiming = pcan_usb_set_bittiming,
+	.dev_set_data_bittiming = NULL,
 	.dev_get_device_id = pcan_usb_get_device_id,
 	.dev_decode_buf = pcan_usb_decode_buf,
 	.dev_encode_msg = pcan_usb_encode_msg,
diff --git a/drivers/net/can/usb/peak_usb/pcan_usb_core.c b/drivers/net/can/usb/peak_usb/pcan_usb_core.c
index 7921cff..76c0624 100644
--- a/drivers/net/can/usb/peak_usb/pcan_usb_core.c
+++ b/drivers/net/can/usb/peak_usb/pcan_usb_core.c
@@ -794,8 +794,13 @@ static int peak_usb_create_dev(const struct peak_usb_adapter *peak_usb_adapter,
 	dev->can.clock = peak_usb_adapter->clock;
 	dev->can.bittiming_const = &peak_usb_adapter->bittiming_const;
 	dev->can.do_set_bittiming = peak_usb_set_bittiming;
-	dev->can.data_bittiming_const = &peak_usb_adapter->data_bittiming_const;
-	dev->can.do_set_data_bittiming = peak_usb_set_data_bittiming;
+	if (peak_usb_adapter->dev_set_data_bittiming) {
+		dev->can.data_bittiming_const = &peak_usb_adapter->data_bittiming_const;
+		dev->can.do_set_data_bittiming = peak_usb_set_data_bittiming;
+	} else {
+		dev->can.data_bittiming_const = NULL;
+		dev->can.do_set_data_bittiming = NULL;
+	}
 	dev->can.do_set_mode = peak_usb_set_mode;
 	dev->can.do_get_berr_counter = peak_usb_adapter->do_get_berr_counter;
 	dev->can.ctrlmode_supported = peak_usb_adapter->ctrlmode_supported;
diff --git a/drivers/net/can/usb/peak_usb/pcan_usb_pro.c b/drivers/net/can/usb/peak_usb/pcan_usb_pro.c
index 7d61b32..9111a54 100644
--- a/drivers/net/can/usb/peak_usb/pcan_usb_pro.c
+++ b/drivers/net/can/usb/peak_usb/pcan_usb_pro.c
@@ -1048,6 +1048,7 @@ const struct peak_usb_adapter pcan_usb_pro = {
 	.dev_free = pcan_usb_pro_free,
 	.dev_set_bus = pcan_usb_pro_set_bus,
 	.dev_set_bittiming = pcan_usb_pro_set_bittiming,
+	.dev_set_data_bittiming = NULL,
 	.dev_get_device_id = pcan_usb_pro_get_device_id,
 	.dev_decode_buf = pcan_usb_pro_decode_buf,
 	.dev_encode_msg = pcan_usb_pro_encode_msg,
-- 
2.1.4

Re: [PATCH] can: pcan_usb: don't provide CAN FD bittimings by non-FD adapters

[Stéphane Grosjean]

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Ok Oliver, you've got my Acked-by!

Thx and regards,

Stéphane

Le 30 juil. 2015 23:53, Oliver Hartkopp <socketcan@hartkopp.net> a écrit :
>
> The CAN FD data bittiming constants are provided via netlink only when there 
> are valid CAN FD constants available in priv->data_bittiming_const. 
>
> Due to the indirection of pointer assignments in the peak_usb driver the 
> priv->data_bittiming_const never becomes NULL - not even for non-FD adapters. 
>
> The data_bittiming_const points to zero'ed data which leads to this result 
> when running 'ip -details link show can0': 
>
> 35: can0: <NOARP,ECHO> mtu 16 qdisc noop state DOWN mode DEFAULT group default qlen 10 
>     link/can  promiscuity 0 
>     can state STOPPED restart-ms 0 
>   pcan_usb: tseg1 1..16 tseg2 1..8 sjw 1..4 brp 1..64 brp-inc 1 
>   : dtseg1 0..0 dtseg2 0..0 dsjw 1..0 dbrp 0..0 dbrp-inc 0  <== BROKEN! 
>   clock 8000000 
>
> This patch sets the dev_set_data_bittiming in struct peak_adapter to NULL to 
> be able to disable the CAN FD specific information on non-FD adapters. 
>
> Relevant for stable kernels 4.0+ 
>
> Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net> 
> --- 
> drivers/net/can/usb/peak_usb/pcan_usb.c      | 1 + 
> drivers/net/can/usb/peak_usb/pcan_usb_core.c | 9 +++++++-- 
> drivers/net/can/usb/peak_usb/pcan_usb_pro.c  | 1 + 
> 3 files changed, 9 insertions(+), 2 deletions(-) 
>
> diff --git a/drivers/net/can/usb/peak_usb/pcan_usb.c b/drivers/net/can/usb/peak_usb/pcan_usb.c 
> index 6b94007..5c4b270 100644 
> --- a/drivers/net/can/usb/peak_usb/pcan_usb.c 
> +++ b/drivers/net/can/usb/peak_usb/pcan_usb.c 
> @@ -896,6 +896,7 @@ const struct peak_usb_adapter pcan_usb = { 
> .dev_init = pcan_usb_init, 
> .dev_set_bus = pcan_usb_write_mode, 
> .dev_set_bittiming = pcan_usb_set_bittiming, 
> + .dev_set_data_bittiming = NULL, 
> .dev_get_device_id = pcan_usb_get_device_id, 
> .dev_decode_buf = pcan_usb_decode_buf, 
> .dev_encode_msg = pcan_usb_encode_msg, 
> diff --git a/drivers/net/can/usb/peak_usb/pcan_usb_core.c b/drivers/net/can/usb/peak_usb/pcan_usb_core.c 
> index 7921cff..76c0624 100644 
> --- a/drivers/net/can/usb/peak_usb/pcan_usb_core.c 
> +++ b/drivers/net/can/usb/peak_usb/pcan_usb_core.c 
> @@ -794,8 +794,13 @@ static int peak_usb_create_dev(const struct peak_usb_adapter *peak_usb_adapter, 
> dev->can.clock = peak_usb_adapter->clock; 
> dev->can.bittiming_const = &peak_usb_adapter->bittiming_const; 
> dev->can.do_set_bittiming = peak_usb_set_bittiming; 
> - dev->can.data_bittiming_const = &peak_usb_adapter->data_bittiming_const; 
> - dev->can.do_set_data_bittiming = peak_usb_set_data_bittiming; 
> + if (peak_usb_adapter->dev_set_data_bittiming) { 
> + dev->can.data_bittiming_const = &peak_usb_adapter->data_bittiming_const; 
> + dev->can.do_set_data_bittiming = peak_usb_set_data_bittiming; 
> + } else { 
> + dev->can.data_bittiming_const = NULL; 
> + dev->can.do_set_data_bittiming = NULL; 
> + } 
> dev->can.do_set_mode = peak_usb_set_mode; 
> dev->can.do_get_berr_counter = peak_usb_adapter->do_get_berr_counter; 
> dev->can.ctrlmode_supported = peak_usb_adapter->ctrlmode_supported; 
> diff --git a/drivers/net/can/usb/peak_usb/pcan_usb_pro.c b/drivers/net/can/usb/peak_usb/pcan_usb_pro.c 
> index 7d61b32..9111a54 100644 
> --- a/drivers/net/can/usb/peak_usb/pcan_usb_pro.c 
> +++ b/drivers/net/can/usb/peak_usb/pcan_usb_pro.c 
> @@ -1048,6 +1048,7 @@ const struct peak_usb_adapter pcan_usb_pro = { 
> .dev_free = pcan_usb_pro_free, 
> .dev_set_bus = pcan_usb_pro_set_bus, 
> .dev_set_bittiming = pcan_usb_pro_set_bittiming, 
> + .dev_set_data_bittiming = NULL, 
> .dev_get_device_id = pcan_usb_pro_get_device_id, 
> .dev_decode_buf = pcan_usb_pro_decode_buf, 
> .dev_encode_msg = pcan_usb_pro_encode_msg, 
> -- 
> 2.1.4 
>

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Sitz der Gesellschaft Darmstadt
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Re: [PATCH] can: pcan_usb: don't provide CAN FD bittimings by non-FD adapters

[Marc Kleine-Budde]

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On 07/30/2015 11:53 PM, Oliver Hartkopp wrote:
> The CAN FD data bittiming constants are provided via netlink only when there
> are valid CAN FD constants available in priv->data_bittiming_const.
> 
> Due to the indirection of pointer assignments in the peak_usb driver the
> priv->data_bittiming_const never becomes NULL - not even for non-FD adapters.
> 
> The data_bittiming_const points to zero'ed data which leads to this result
> when running 'ip -details link show can0':
> 
> 35: can0: <NOARP,ECHO> mtu 16 qdisc noop state DOWN mode DEFAULT group default qlen 10
>     link/can  promiscuity 0
>     can state STOPPED restart-ms 0
> 	  pcan_usb: tseg1 1..16 tseg2 1..8 sjw 1..4 brp 1..64 brp-inc 1
> 	  : dtseg1 0..0 dtseg2 0..0 dsjw 1..0 dbrp 0..0 dbrp-inc 0  <== BROKEN!
> 	  clock 8000000
> 
> This patch sets the dev_set_data_bittiming in struct peak_adapter to NULL to
> be able to disable the CAN FD specific information on non-FD adapters.
> 
> Relevant for stable kernels 4.0+
> 
> Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net>
> ---
>  drivers/net/can/usb/peak_usb/pcan_usb.c      | 1 +
>  drivers/net/can/usb/peak_usb/pcan_usb_core.c | 9 +++++++--
>  drivers/net/can/usb/peak_usb/pcan_usb_pro.c  | 1 +
>  3 files changed, 9 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/can/usb/peak_usb/pcan_usb.c b/drivers/net/can/usb/peak_usb/pcan_usb.c
> index 6b94007..5c4b270 100644
> --- a/drivers/net/can/usb/peak_usb/pcan_usb.c
> +++ b/drivers/net/can/usb/peak_usb/pcan_usb.c
> @@ -896,6 +896,7 @@ const struct peak_usb_adapter pcan_usb = {
>  	.dev_init = pcan_usb_init,
>  	.dev_set_bus = pcan_usb_write_mode,
>  	.dev_set_bittiming = pcan_usb_set_bittiming,
> +	.dev_set_data_bittiming = NULL,

Due to C99 initializers this is not needed, as unset elements are
automatically set to 0.

>  	.dev_get_device_id = pcan_usb_get_device_id,
>  	.dev_decode_buf = pcan_usb_decode_buf,
>  	.dev_encode_msg = pcan_usb_encode_msg,
> diff --git a/drivers/net/can/usb/peak_usb/pcan_usb_core.c b/drivers/net/can/usb/peak_usb/pcan_usb_core.c
> index 7921cff..76c0624 100644
> --- a/drivers/net/can/usb/peak_usb/pcan_usb_core.c
> +++ b/drivers/net/can/usb/peak_usb/pcan_usb_core.c
> @@ -794,8 +794,13 @@ static int peak_usb_create_dev(const struct peak_usb_adapter *peak_usb_adapter,
>  	dev->can.clock = peak_usb_adapter->clock;
>  	dev->can.bittiming_const = &peak_usb_adapter->bittiming_const;
>  	dev->can.do_set_bittiming = peak_usb_set_bittiming;
> -	dev->can.data_bittiming_const = &peak_usb_adapter->data_bittiming_const;
> -	dev->can.do_set_data_bittiming = peak_usb_set_data_bittiming;

Set bittiming can be assigned unconditionally. We just have to take care
about data_bittiming_const.

> +	if (peak_usb_adapter->dev_set_data_bittiming) {
> +		dev->can.data_bittiming_const = &peak_usb_adapter->data_bittiming_const;
> +		dev->can.do_set_data_bittiming = peak_usb_set_data_bittiming;
> +	} else {
> +		dev->can.data_bittiming_const = NULL;
> +		dev->can.do_set_data_bittiming = NULL;
> +	}
>  	dev->can.do_set_mode = peak_usb_set_mode;
>  	dev->can.do_get_berr_counter = peak_usb_adapter->do_get_berr_counter;
>  	dev->can.ctrlmode_supported = peak_usb_adapter->ctrlmode_supported;
> diff --git a/drivers/net/can/usb/peak_usb/pcan_usb_pro.c b/drivers/net/can/usb/peak_usb/pcan_usb_pro.c
> index 7d61b32..9111a54 100644
> --- a/drivers/net/can/usb/peak_usb/pcan_usb_pro.c
> +++ b/drivers/net/can/usb/peak_usb/pcan_usb_pro.c
> @@ -1048,6 +1048,7 @@ const struct peak_usb_adapter pcan_usb_pro = {
>  	.dev_free = pcan_usb_pro_free,
>  	.dev_set_bus = pcan_usb_pro_set_bus,
>  	.dev_set_bittiming = pcan_usb_pro_set_bittiming,
> +	.dev_set_data_bittiming = NULL,

not needed, C99.

>  	.dev_get_device_id = pcan_usb_pro_get_device_id,
>  	.dev_decode_buf = pcan_usb_pro_decode_buf,
>  	.dev_encode_msg = pcan_usb_pro_encode_msg,
> 

Marc

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pull-request: can 2015-08-24

[Marc Kleine-Budde]

Hello David,

this is a pull request of one patch by me for the peak_usb driver. It fixes the
driver, so that non FD adapters don't provide CAN FD bittimings.

regards,
Marc

----

The following changes since commit b6df7d61c8776a882dd47ba4714d1445dd7ef2d9:

  net: bcmgenet: fix uncleaned dma flags (2015-08-23 23:00:41 -0700)

are available in the git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/mkl/linux-can.git tags/linux-can-fixes-for-4.2-20150824

for you to fetch changes up to ffa115d30dec793f37ca661d2d3f8e35c14559e9:

  can: pcan_usb: don't provide CAN FD bittimings by non-FD adapters (2015-08-24 11:15:10 +0200)

----------------------------------------------------------------
linux-can-fixes-for-4.2-20150824

----------------------------------------------------------------
Marc Kleine-Budde (1):
      can: pcan_usb: don't provide CAN FD bittimings by non-FD adapters

 drivers/net/can/usb/peak_usb/pcan_usb.c      | 24 +++----
 drivers/net/can/usb/peak_usb/pcan_usb_core.c |  4 +-
 drivers/net/can/usb/peak_usb/pcan_usb_core.h |  4 +-
 drivers/net/can/usb/peak_usb/pcan_usb_fd.c   | 96 +++++++++++++++-------------
 drivers/net/can/usb/peak_usb/pcan_usb_pro.c  | 24 +++----
 5 files changed, 82 insertions(+), 70 deletions(-)

[PATCH] can: pcan_usb: don't provide CAN FD bittimings by non-FD adapters

[Marc Kleine-Budde]

The CAN FD data bittiming constants are provided via netlink only when there
are valid CAN FD constants available in priv->data_bittiming_const.

Due to the indirection of pointer assignments in the peak_usb driver the
priv->data_bittiming_const never becomes NULL - not even for non-FD adapters.

The data_bittiming_const points to zero'ed data which leads to this result
when running 'ip -details link show can0':

35: can0: <NOARP,ECHO> mtu 16 qdisc noop state DOWN mode DEFAULT group default qlen 10
    link/can  promiscuity 0
    can state STOPPED restart-ms 0
	  pcan_usb: tseg1 1..16 tseg2 1..8 sjw 1..4 brp 1..64 brp-inc 1
	  : dtseg1 0..0 dtseg2 0..0 dsjw 1..0 dbrp 0..0 dbrp-inc 0  <== BROKEN!
	  clock 8000000

This patch sets the dev_set_data_bittiming in struct peak_adapter to NULL to
be able to disable the CAN FD specific information on non-FD adapters.

This patch changes the struct peak_usb_adapter::bittiming_const and struct
peak_usb_adapter::data_bittiming_const to pointers to fix the assignemnt
problems.

Cc: linux-stable <stable@vger.kernel.org> # >= 4.0
Reported-off-by: Oliver Hartkopp <socketcan@hartkopp.net>
Tested-by: Oliver Hartkopp <socketcan@hartkopp.net>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
---
 drivers/net/can/usb/peak_usb/pcan_usb.c      | 24 +++----
 drivers/net/can/usb/peak_usb/pcan_usb_core.c |  4 +-
 drivers/net/can/usb/peak_usb/pcan_usb_core.h |  4 +-
 drivers/net/can/usb/peak_usb/pcan_usb_fd.c   | 96 +++++++++++++++-------------
 drivers/net/can/usb/peak_usb/pcan_usb_pro.c  | 24 +++----
 5 files changed, 82 insertions(+), 70 deletions(-)

diff --git a/drivers/net/can/usb/peak_usb/pcan_usb.c b/drivers/net/can/usb/peak_usb/pcan_usb.c
index 6b94007ae052..838545ce468d 100644
--- a/drivers/net/can/usb/peak_usb/pcan_usb.c
+++ b/drivers/net/can/usb/peak_usb/pcan_usb.c
@@ -854,6 +854,18 @@ static int pcan_usb_probe(struct usb_interface *intf)
 /*
  * describe the PCAN-USB adapter
  */
+static const struct can_bittiming_const pcan_usb_const = {
+	.name = "pcan_usb",
+	.tseg1_min = 1,
+	.tseg1_max = 16,
+	.tseg2_min = 1,
+	.tseg2_max = 8,
+	.sjw_max = 4,
+	.brp_min = 1,
+	.brp_max = 64,
+	.brp_inc = 1,
+};
+
 const struct peak_usb_adapter pcan_usb = {
 	.name = "PCAN-USB",
 	.device_id = PCAN_USB_PRODUCT_ID,
@@ -862,17 +874,7 @@ const struct peak_usb_adapter pcan_usb = {
 	.clock = {
 		.freq = PCAN_USB_CRYSTAL_HZ / 2 ,
 	},
-	.bittiming_const = {
-		.name = "pcan_usb",
-		.tseg1_min = 1,
-		.tseg1_max = 16,
-		.tseg2_min = 1,
-		.tseg2_max = 8,
-		.sjw_max = 4,
-		.brp_min = 1,
-		.brp_max = 64,
-		.brp_inc = 1,
-	},
+	.bittiming_const = &pcan_usb_const,
 
 	/* size of device private data */
 	.sizeof_dev_private = sizeof(struct pcan_usb),
diff --git a/drivers/net/can/usb/peak_usb/pcan_usb_core.c b/drivers/net/can/usb/peak_usb/pcan_usb_core.c
index 7921cff93a63..5a2e341a6d1e 100644
--- a/drivers/net/can/usb/peak_usb/pcan_usb_core.c
+++ b/drivers/net/can/usb/peak_usb/pcan_usb_core.c
@@ -792,9 +792,9 @@ static int peak_usb_create_dev(const struct peak_usb_adapter *peak_usb_adapter,
 	dev->ep_msg_out = peak_usb_adapter->ep_msg_out[ctrl_idx];
 
 	dev->can.clock = peak_usb_adapter->clock;
-	dev->can.bittiming_const = &peak_usb_adapter->bittiming_const;
+	dev->can.bittiming_const = peak_usb_adapter->bittiming_const;
 	dev->can.do_set_bittiming = peak_usb_set_bittiming;
-	dev->can.data_bittiming_const = &peak_usb_adapter->data_bittiming_const;
+	dev->can.data_bittiming_const = peak_usb_adapter->data_bittiming_const;
 	dev->can.do_set_data_bittiming = peak_usb_set_data_bittiming;
 	dev->can.do_set_mode = peak_usb_set_mode;
 	dev->can.do_get_berr_counter = peak_usb_adapter->do_get_berr_counter;
diff --git a/drivers/net/can/usb/peak_usb/pcan_usb_core.h b/drivers/net/can/usb/peak_usb/pcan_usb_core.h
index 9e624f05ad4d..506fe506c9d3 100644
--- a/drivers/net/can/usb/peak_usb/pcan_usb_core.h
+++ b/drivers/net/can/usb/peak_usb/pcan_usb_core.h
@@ -48,8 +48,8 @@ struct peak_usb_adapter {
 	u32 device_id;
 	u32 ctrlmode_supported;
 	struct can_clock clock;
-	const struct can_bittiming_const bittiming_const;
-	const struct can_bittiming_const data_bittiming_const;
+	const struct can_bittiming_const * const bittiming_const;
+	const struct can_bittiming_const * const data_bittiming_const;
 	unsigned int ctrl_count;
 
 	int (*intf_probe)(struct usb_interface *intf);
diff --git a/drivers/net/can/usb/peak_usb/pcan_usb_fd.c b/drivers/net/can/usb/peak_usb/pcan_usb_fd.c
index 09d14e70abd7..ce44a033f63b 100644
--- a/drivers/net/can/usb/peak_usb/pcan_usb_fd.c
+++ b/drivers/net/can/usb/peak_usb/pcan_usb_fd.c
@@ -990,6 +990,30 @@ static void pcan_usb_fd_free(struct peak_usb_device *dev)
 }
 
 /* describes the PCAN-USB FD adapter */
+static const struct can_bittiming_const pcan_usb_fd_const = {
+	.name = "pcan_usb_fd",
+	.tseg1_min = 1,
+	.tseg1_max = 64,
+	.tseg2_min = 1,
+	.tseg2_max = 16,
+	.sjw_max = 16,
+	.brp_min = 1,
+	.brp_max = 1024,
+	.brp_inc = 1,
+};
+
+static const struct can_bittiming_const pcan_usb_fd_data_const = {
+	.name = "pcan_usb_fd",
+	.tseg1_min = 1,
+	.tseg1_max = 16,
+	.tseg2_min = 1,
+	.tseg2_max = 8,
+	.sjw_max = 4,
+	.brp_min = 1,
+	.brp_max = 1024,
+	.brp_inc = 1,
+};
+
 const struct peak_usb_adapter pcan_usb_fd = {
 	.name = "PCAN-USB FD",
 	.device_id = PCAN_USBFD_PRODUCT_ID,
@@ -999,28 +1023,8 @@ const struct peak_usb_adapter pcan_usb_fd = {
 	.clock = {
 		.freq = PCAN_UFD_CRYSTAL_HZ,
 	},
-	.bittiming_const = {
-		.name = "pcan_usb_fd",
-		.tseg1_min = 1,
-		.tseg1_max = 64,
-		.tseg2_min = 1,
-		.tseg2_max = 16,
-		.sjw_max = 16,
-		.brp_min = 1,
-		.brp_max = 1024,
-		.brp_inc = 1,
-	},
-	.data_bittiming_const = {
-		.name = "pcan_usb_fd",
-		.tseg1_min = 1,
-		.tseg1_max = 16,
-		.tseg2_min = 1,
-		.tseg2_max = 8,
-		.sjw_max = 4,
-		.brp_min = 1,
-		.brp_max = 1024,
-		.brp_inc = 1,
-	},
+	.bittiming_const = &pcan_usb_fd_const,
+	.data_bittiming_const = &pcan_usb_fd_data_const,
 
 	/* size of device private data */
 	.sizeof_dev_private = sizeof(struct pcan_usb_fd_device),
@@ -1058,6 +1062,30 @@ const struct peak_usb_adapter pcan_usb_fd = {
 };
 
 /* describes the PCAN-USB Pro FD adapter */
+static const struct can_bittiming_const pcan_usb_pro_fd_const = {
+	.name = "pcan_usb_pro_fd",
+	.tseg1_min = 1,
+	.tseg1_max = 64,
+	.tseg2_min = 1,
+	.tseg2_max = 16,
+	.sjw_max = 16,
+	.brp_min = 1,
+	.brp_max = 1024,
+	.brp_inc = 1,
+};
+
+static const struct can_bittiming_const pcan_usb_pro_fd_data_const = {
+	.name = "pcan_usb_pro_fd",
+	.tseg1_min = 1,
+	.tseg1_max = 16,
+	.tseg2_min = 1,
+	.tseg2_max = 8,
+	.sjw_max = 4,
+	.brp_min = 1,
+	.brp_max = 1024,
+	.brp_inc = 1,
+};
+
 const struct peak_usb_adapter pcan_usb_pro_fd = {
 	.name = "PCAN-USB Pro FD",
 	.device_id = PCAN_USBPROFD_PRODUCT_ID,
@@ -1067,28 +1095,8 @@ const struct peak_usb_adapter pcan_usb_pro_fd = {
 	.clock = {
 		.freq = PCAN_UFD_CRYSTAL_HZ,
 	},
-	.bittiming_const = {
-		.name = "pcan_usb_pro_fd",
-		.tseg1_min = 1,
-		.tseg1_max = 64,
-		.tseg2_min = 1,
-		.tseg2_max = 16,
-		.sjw_max = 16,
-		.brp_min = 1,
-		.brp_max = 1024,
-		.brp_inc = 1,
-	},
-	.data_bittiming_const = {
-		.name = "pcan_usb_pro_fd",
-		.tseg1_min = 1,
-		.tseg1_max = 16,
-		.tseg2_min = 1,
-		.tseg2_max = 8,
-		.sjw_max = 4,
-		.brp_min = 1,
-		.brp_max = 1024,
-		.brp_inc = 1,
-	},
+	.bittiming_const = &pcan_usb_pro_fd_const,
+	.data_bittiming_const = &pcan_usb_pro_fd_data_const,
 
 	/* size of device private data */
 	.sizeof_dev_private = sizeof(struct pcan_usb_fd_device),
diff --git a/drivers/net/can/usb/peak_usb/pcan_usb_pro.c b/drivers/net/can/usb/peak_usb/pcan_usb_pro.c
index 7d61b3279798..bbdd6058cd2f 100644
--- a/drivers/net/can/usb/peak_usb/pcan_usb_pro.c
+++ b/drivers/net/can/usb/peak_usb/pcan_usb_pro.c
@@ -1004,6 +1004,18 @@ int pcan_usb_pro_probe(struct usb_interface *intf)
 /*
  * describe the PCAN-USB Pro adapter
  */
+static const struct can_bittiming_const pcan_usb_pro_const = {
+	.name = "pcan_usb_pro",
+	.tseg1_min = 1,
+	.tseg1_max = 16,
+	.tseg2_min = 1,
+	.tseg2_max = 8,
+	.sjw_max = 4,
+	.brp_min = 1,
+	.brp_max = 1024,
+	.brp_inc = 1,
+};
+
 const struct peak_usb_adapter pcan_usb_pro = {
 	.name = "PCAN-USB Pro",
 	.device_id = PCAN_USBPRO_PRODUCT_ID,
@@ -1012,17 +1024,7 @@ const struct peak_usb_adapter pcan_usb_pro = {
 	.clock = {
 		.freq = PCAN_USBPRO_CRYSTAL_HZ,
 	},
-	.bittiming_const = {
-		.name = "pcan_usb_pro",
-		.tseg1_min = 1,
-		.tseg1_max = 16,
-		.tseg2_min = 1,
-		.tseg2_max = 8,
-		.sjw_max = 4,
-		.brp_min = 1,
-		.brp_max = 1024,
-		.brp_inc = 1,
-	},
+	.bittiming_const = &pcan_usb_pro_const,
 
 	/* size of device private data */
 	.sizeof_dev_private = sizeof(struct pcan_usb_pro_device),
-- 
2.5.0

pull-request: can 2015-08-25

[Marc Kleine-Budde]

Hello David,

this is the updated pull request of one patch by me for the peak_usb driver. It
fixes the driver, so that non FD adapters don't provide CAN FD bittimings.

regards,
Marc

---

The following changes since commit b6df7d61c8776a882dd47ba4714d1445dd7ef2d9:

  net: bcmgenet: fix uncleaned dma flags (2015-08-23 23:00:41 -0700)

are available in the git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/mkl/linux-can.git tags/linux-can-fixes-for-4.2-20150825

for you to fetch changes up to 06b23f7fbbf26a025fd68395c7586949db586b47:

  can: pcan_usb: don't provide CAN FD bittimings by non-FD adapters (2015-08-25 08:50:00 +0200)

----------------------------------------------------------------
linux-can-fixes-for-4.2-20150825

----------------------------------------------------------------
Marc Kleine-Budde (1):
      can: pcan_usb: don't provide CAN FD bittimings by non-FD adapters

 drivers/net/can/usb/peak_usb/pcan_usb.c      | 24 +++----
 drivers/net/can/usb/peak_usb/pcan_usb_core.c |  4 +-
 drivers/net/can/usb/peak_usb/pcan_usb_core.h |  4 +-
 drivers/net/can/usb/peak_usb/pcan_usb_fd.c   | 96 +++++++++++++++-------------
 drivers/net/can/usb/peak_usb/pcan_usb_pro.c  | 24 +++----
 5 files changed, 82 insertions(+), 70 deletions(-)

[PATCH] can: pcan_usb: don't provide CAN FD bittimings by non-FD adapters

[Marc Kleine-Budde]

The CAN FD data bittiming constants are provided via netlink only when there
are valid CAN FD constants available in priv->data_bittiming_const.

Due to the indirection of pointer assignments in the peak_usb driver the
priv->data_bittiming_const never becomes NULL - not even for non-FD adapters.

The data_bittiming_const points to zero'ed data which leads to this result
when running 'ip -details link show can0':

35: can0: <NOARP,ECHO> mtu 16 qdisc noop state DOWN mode DEFAULT group default qlen 10
    link/can  promiscuity 0
    can state STOPPED restart-ms 0
	  pcan_usb: tseg1 1..16 tseg2 1..8 sjw 1..4 brp 1..64 brp-inc 1
	  : dtseg1 0..0 dtseg2 0..0 dsjw 1..0 dbrp 0..0 dbrp-inc 0  <== BROKEN!
	  clock 8000000

This patch changes the struct peak_usb_adapter::bittiming_const and struct
peak_usb_adapter::data_bittiming_const to pointers to fix the assignemnt
problems.

Cc: linux-stable <stable@vger.kernel.org> # >= 4.0
Reported-by: Oliver Hartkopp <socketcan@hartkopp.net>
Tested-by: Oliver Hartkopp <socketcan@hartkopp.net>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
---
 drivers/net/can/usb/peak_usb/pcan_usb.c      | 24 +++----
 drivers/net/can/usb/peak_usb/pcan_usb_core.c |  4 +-
 drivers/net/can/usb/peak_usb/pcan_usb_core.h |  4 +-
 drivers/net/can/usb/peak_usb/pcan_usb_fd.c   | 96 +++++++++++++++-------------
 drivers/net/can/usb/peak_usb/pcan_usb_pro.c  | 24 +++----
 5 files changed, 82 insertions(+), 70 deletions(-)

diff --git a/drivers/net/can/usb/peak_usb/pcan_usb.c b/drivers/net/can/usb/peak_usb/pcan_usb.c
index 6b94007ae052..838545ce468d 100644
--- a/drivers/net/can/usb/peak_usb/pcan_usb.c
+++ b/drivers/net/can/usb/peak_usb/pcan_usb.c
@@ -854,6 +854,18 @@ static int pcan_usb_probe(struct usb_interface *intf)
 /*
  * describe the PCAN-USB adapter
  */
+static const struct can_bittiming_const pcan_usb_const = {
+	.name = "pcan_usb",
+	.tseg1_min = 1,
+	.tseg1_max = 16,
+	.tseg2_min = 1,
+	.tseg2_max = 8,
+	.sjw_max = 4,
+	.brp_min = 1,
+	.brp_max = 64,
+	.brp_inc = 1,
+};
+
 const struct peak_usb_adapter pcan_usb = {
 	.name = "PCAN-USB",
 	.device_id = PCAN_USB_PRODUCT_ID,
@@ -862,17 +874,7 @@ const struct peak_usb_adapter pcan_usb = {
 	.clock = {
 		.freq = PCAN_USB_CRYSTAL_HZ / 2 ,
 	},
-	.bittiming_const = {
-		.name = "pcan_usb",
-		.tseg1_min = 1,
-		.tseg1_max = 16,
-		.tseg2_min = 1,
-		.tseg2_max = 8,
-		.sjw_max = 4,
-		.brp_min = 1,
-		.brp_max = 64,
-		.brp_inc = 1,
-	},
+	.bittiming_const = &pcan_usb_const,
 
 	/* size of device private data */
 	.sizeof_dev_private = sizeof(struct pcan_usb),
diff --git a/drivers/net/can/usb/peak_usb/pcan_usb_core.c b/drivers/net/can/usb/peak_usb/pcan_usb_core.c
index 7921cff93a63..5a2e341a6d1e 100644
--- a/drivers/net/can/usb/peak_usb/pcan_usb_core.c
+++ b/drivers/net/can/usb/peak_usb/pcan_usb_core.c
@@ -792,9 +792,9 @@ static int peak_usb_create_dev(const struct peak_usb_adapter *peak_usb_adapter,
 	dev->ep_msg_out = peak_usb_adapter->ep_msg_out[ctrl_idx];
 
 	dev->can.clock = peak_usb_adapter->clock;
-	dev->can.bittiming_const = &peak_usb_adapter->bittiming_const;
+	dev->can.bittiming_const = peak_usb_adapter->bittiming_const;
 	dev->can.do_set_bittiming = peak_usb_set_bittiming;
-	dev->can.data_bittiming_const = &peak_usb_adapter->data_bittiming_const;
+	dev->can.data_bittiming_const = peak_usb_adapter->data_bittiming_const;
 	dev->can.do_set_data_bittiming = peak_usb_set_data_bittiming;
 	dev->can.do_set_mode = peak_usb_set_mode;
 	dev->can.do_get_berr_counter = peak_usb_adapter->do_get_berr_counter;
diff --git a/drivers/net/can/usb/peak_usb/pcan_usb_core.h b/drivers/net/can/usb/peak_usb/pcan_usb_core.h
index 9e624f05ad4d..506fe506c9d3 100644
--- a/drivers/net/can/usb/peak_usb/pcan_usb_core.h
+++ b/drivers/net/can/usb/peak_usb/pcan_usb_core.h
@@ -48,8 +48,8 @@ struct peak_usb_adapter {
 	u32 device_id;
 	u32 ctrlmode_supported;
 	struct can_clock clock;
-	const struct can_bittiming_const bittiming_const;
-	const struct can_bittiming_const data_bittiming_const;
+	const struct can_bittiming_const * const bittiming_const;
+	const struct can_bittiming_const * const data_bittiming_const;
 	unsigned int ctrl_count;
 
 	int (*intf_probe)(struct usb_interface *intf);
diff --git a/drivers/net/can/usb/peak_usb/pcan_usb_fd.c b/drivers/net/can/usb/peak_usb/pcan_usb_fd.c
index 09d14e70abd7..ce44a033f63b 100644
--- a/drivers/net/can/usb/peak_usb/pcan_usb_fd.c
+++ b/drivers/net/can/usb/peak_usb/pcan_usb_fd.c
@@ -990,6 +990,30 @@ static void pcan_usb_fd_free(struct peak_usb_device *dev)
 }
 
 /* describes the PCAN-USB FD adapter */
+static const struct can_bittiming_const pcan_usb_fd_const = {
+	.name = "pcan_usb_fd",
+	.tseg1_min = 1,
+	.tseg1_max = 64,
+	.tseg2_min = 1,
+	.tseg2_max = 16,
+	.sjw_max = 16,
+	.brp_min = 1,
+	.brp_max = 1024,
+	.brp_inc = 1,
+};
+
+static const struct can_bittiming_const pcan_usb_fd_data_const = {
+	.name = "pcan_usb_fd",
+	.tseg1_min = 1,
+	.tseg1_max = 16,
+	.tseg2_min = 1,
+	.tseg2_max = 8,
+	.sjw_max = 4,
+	.brp_min = 1,
+	.brp_max = 1024,
+	.brp_inc = 1,
+};
+
 const struct peak_usb_adapter pcan_usb_fd = {
 	.name = "PCAN-USB FD",
 	.device_id = PCAN_USBFD_PRODUCT_ID,
@@ -999,28 +1023,8 @@ const struct peak_usb_adapter pcan_usb_fd = {
 	.clock = {
 		.freq = PCAN_UFD_CRYSTAL_HZ,
 	},
-	.bittiming_const = {
-		.name = "pcan_usb_fd",
-		.tseg1_min = 1,
-		.tseg1_max = 64,
-		.tseg2_min = 1,
-		.tseg2_max = 16,
-		.sjw_max = 16,
-		.brp_min = 1,
-		.brp_max = 1024,
-		.brp_inc = 1,
-	},
-	.data_bittiming_const = {
-		.name = "pcan_usb_fd",
-		.tseg1_min = 1,
-		.tseg1_max = 16,
-		.tseg2_min = 1,
-		.tseg2_max = 8,
-		.sjw_max = 4,
-		.brp_min = 1,
-		.brp_max = 1024,
-		.brp_inc = 1,
-	},
+	.bittiming_const = &pcan_usb_fd_const,
+	.data_bittiming_const = &pcan_usb_fd_data_const,
 
 	/* size of device private data */
 	.sizeof_dev_private = sizeof(struct pcan_usb_fd_device),
@@ -1058,6 +1062,30 @@ const struct peak_usb_adapter pcan_usb_fd = {
 };
 
 /* describes the PCAN-USB Pro FD adapter */
+static const struct can_bittiming_const pcan_usb_pro_fd_const = {
+	.name = "pcan_usb_pro_fd",
+	.tseg1_min = 1,
+	.tseg1_max = 64,
+	.tseg2_min = 1,
+	.tseg2_max = 16,
+	.sjw_max = 16,
+	.brp_min = 1,
+	.brp_max = 1024,
+	.brp_inc = 1,
+};
+
+static const struct can_bittiming_const pcan_usb_pro_fd_data_const = {
+	.name = "pcan_usb_pro_fd",
+	.tseg1_min = 1,
+	.tseg1_max = 16,
+	.tseg2_min = 1,
+	.tseg2_max = 8,
+	.sjw_max = 4,
+	.brp_min = 1,
+	.brp_max = 1024,
+	.brp_inc = 1,
+};
+
 const struct peak_usb_adapter pcan_usb_pro_fd = {
 	.name = "PCAN-USB Pro FD",
 	.device_id = PCAN_USBPROFD_PRODUCT_ID,
@@ -1067,28 +1095,8 @@ const struct peak_usb_adapter pcan_usb_pro_fd = {
 	.clock = {
 		.freq = PCAN_UFD_CRYSTAL_HZ,
 	},
-	.bittiming_const = {
-		.name = "pcan_usb_pro_fd",
-		.tseg1_min = 1,
-		.tseg1_max = 64,
-		.tseg2_min = 1,
-		.tseg2_max = 16,
-		.sjw_max = 16,
-		.brp_min = 1,
-		.brp_max = 1024,
-		.brp_inc = 1,
-	},
-	.data_bittiming_const = {
-		.name = "pcan_usb_pro_fd",
-		.tseg1_min = 1,
-		.tseg1_max = 16,
-		.tseg2_min = 1,
-		.tseg2_max = 8,
-		.sjw_max = 4,
-		.brp_min = 1,
-		.brp_max = 1024,
-		.brp_inc = 1,
-	},
+	.bittiming_const = &pcan_usb_pro_fd_const,
+	.data_bittiming_const = &pcan_usb_pro_fd_data_const,
 
 	/* size of device private data */
 	.sizeof_dev_private = sizeof(struct pcan_usb_fd_device),
diff --git a/drivers/net/can/usb/peak_usb/pcan_usb_pro.c b/drivers/net/can/usb/peak_usb/pcan_usb_pro.c
index 7d61b3279798..bbdd6058cd2f 100644
--- a/drivers/net/can/usb/peak_usb/pcan_usb_pro.c
+++ b/drivers/net/can/usb/peak_usb/pcan_usb_pro.c
@@ -1004,6 +1004,18 @@ int pcan_usb_pro_probe(struct usb_interface *intf)
 /*
  * describe the PCAN-USB Pro adapter
  */
+static const struct can_bittiming_const pcan_usb_pro_const = {
+	.name = "pcan_usb_pro",
+	.tseg1_min = 1,
+	.tseg1_max = 16,
+	.tseg2_min = 1,
+	.tseg2_max = 8,
+	.sjw_max = 4,
+	.brp_min = 1,
+	.brp_max = 1024,
+	.brp_inc = 1,
+};
+
 const struct peak_usb_adapter pcan_usb_pro = {
 	.name = "PCAN-USB Pro",
 	.device_id = PCAN_USBPRO_PRODUCT_ID,
@@ -1012,17 +1024,7 @@ const struct peak_usb_adapter pcan_usb_pro = {
 	.clock = {
 		.freq = PCAN_USBPRO_CRYSTAL_HZ,
 	},
-	.bittiming_const = {
-		.name = "pcan_usb_pro",
-		.tseg1_min = 1,
-		.tseg1_max = 16,
-		.tseg2_min = 1,
-		.tseg2_max = 8,
-		.sjw_max = 4,
-		.brp_min = 1,
-		.brp_max = 1024,
-		.brp_inc = 1,
-	},
+	.bittiming_const = &pcan_usb_pro_const,
 
 	/* size of device private data */
 	.sizeof_dev_private = sizeof(struct pcan_usb_pro_device),
-- 
2.5.0