5.10-stable review patch. If anyone has any objections, please let me know. ------------------ From: Patrick Menschel <menschel.p@xxxxxxxxx> commit c69d190f7bb9a03cf5237d45a457993730d01605 upstream This patch adds an additional error message in case that txqueuelen is set too small and advices the user to increase txqueuelen. This is likely to happen even with small transfers if txqueuelen is at default value 10 frames. Link: https://lore.kernel.org/r/20210427052150.2308-4-menschel.p@xxxxxxxxx Signed-off-by: Patrick Menschel <menschel.p@xxxxxxxxx> Signed-off-by: Marc Kleine-Budde <mkl@xxxxxxxxxxxxxx> Signed-off-by: Oliver Hartkopp <socketcan@xxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- net/can/isotp.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) --- a/net/can/isotp.c +++ b/net/can/isotp.c @@ -813,10 +813,12 @@ isotp_tx_burst: can_skb_set_owner(skb, sk); can_send_ret = can_send(skb, 1); - if (can_send_ret) + if (can_send_ret) { pr_notice_once("can-isotp: %s: can_send_ret %pe\n", __func__, ERR_PTR(can_send_ret)); - + if (can_send_ret == -ENOBUFS) + pr_notice_once("can-isotp: tx queue is full, increasing txqueuelen may prevent this error\n"); + } if (so->tx.idx >= so->tx.len) { /* we are done */ so->tx.state = ISOTP_IDLE;
