4.14-stable review patch. If anyone has any objections, please let me know.
------------------
From: Marc Kleine-Budde <mkl@xxxxxxxxxxxxxx>
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@xxxxxxxxxxxxxxx>
Signed-off-by: Marc Kleine-Budde <mkl@xxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
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
@@ -483,11 +483,14 @@ 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;
