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can: dev: __can_get_echo_skb(): replace struct can_frame by canfd_frame to access frame length

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This patch replaces the use of "struct can_frame::can_dlc" by "struct
canfd_frame::len" to access the frame's length. As it is ensured that
both structures have a compatible memory layout for this member this is
no functional change. Futher, this compatibility is documented in a
comment.

Cc: linux-stable <stable@vger.kernel.org>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
This commit is contained in:
Marc Kleine-Budde 2018-10-31 11:08:21 +01:00
parent a4310fa2f2
commit 200f5c49f7
1 changed files with 6 additions and 3 deletions
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9
drivers/net/can/dev.c
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@ -484,11 +484,14 @@ struct sk_buff *__can_get_echo_skb(struct net_device *dev, unsigned int idx, u8
BUG_ON(idx >= priv->echo_skb_max);
if (priv->echo_skb[idx]) {
/* Using "struct canfd_frame::len" for the frame
* length is supported on both CAN and CANFD frames.
*/
struct sk_buff *skb = priv->echo_skb[idx];
struct can_frame *cf = (struct can_frame *)skb->data;
u8 dlc = cf->can_dlc;
struct canfd_frame *cf = (struct canfd_frame *)skb->data;
u8 len = cf->len;
*len_ptr = dlc;
*len_ptr = len;
priv->echo_skb[idx] = NULL;
return skb;