4.9-stable review patch. If anyone has any objections, please let me know.
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From: Marc Kleine-Budde mkl@pengutronix.de
commit 200f5c49f7a2cd694436bfc6cb0662b794c96736 upstream.
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 Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/net/can/dev.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-)
--- a/drivers/net/can/dev.c +++ b/drivers/net/can/dev.c @@ -460,11 +460,14 @@ struct sk_buff *__can_get_echo_skb(struc 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;