Patch "can: isotp: Add error message if txqueuelen is too small" has been added to the 5.10-stable tree

[<gregkh@linuxfoundation.org>]

This is a note to let you know that I've just added the patch titled

    can: isotp: Add error message if txqueuelen is too small

to the 5.10-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     can-isotp-add-error-message-if-txqueuelen-is-too-small.patch
and it can be found in the queue-5.10 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


From stable-owner@vger.kernel.org Tue Oct 31 10:30:23 2023
From: Oliver Hartkopp <socketcan@hartkopp.net>
Date: Tue, 31 Oct 2023 10:29:11 +0100
Subject: can: isotp: Add error message if txqueuelen is too small
To: gregkh@linuxfoundation.org, stable@vger.kernel.org, sashal@kernel.org
Cc: linux-can@vger.kernel.org, lukas.magel@posteo.net, patches@lists.linux.dev, maxime.jayat@mobile-devices.fr, mkl@pengutronix.de, michal.sojka@cvut.cz, Patrick Menschel <menschel.p@posteo.de>, Oliver Hartkopp <socketcan@hartkopp.net>
Message-ID: <20231031092918.2668-4-socketcan@hartkopp.net>

From: Patrick Menschel <menschel.p@posteo.de>

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@posteo.de
Signed-off-by: Patrick Menschel <menschel.p@posteo.de>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 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;


Patches currently in stable-queue which might be from stable-owner@vger.kernel.org are

queue-5.10/ext4-avoid-overlapping-preallocations-due-to-overflow.patch
queue-5.10/can-isotp-isotp_bind-do-not-validate-unused-address-information.patch
queue-5.10/can-isotp-set-max-pdu-size-to-64-kbyte.patch
queue-5.10/can-isotp-isotp_bind-return-einval-on-incorrect-can-id-formatting.patch
queue-5.10/ext4-fix-bug-in-ext4_mb_new_inode_pa-due-to-overflow.patch
queue-5.10/can-isotp-add-symbolic-error-message-to-isotp_module_init.patch
queue-5.10/rpmsg-fix-calling-device_lock-on-non-initialized-device.patch
queue-5.10/can-isotp-change-error-format-from-decimal-to-symbolic-error-names.patch
queue-5.10/can-isotp-isotp_sendmsg-fix-tx-state-detection-and-wait-behavior.patch
queue-5.10/rpmsg-constify-local-variable-in-field-store-macro.patch
queue-5.10/can-isotp-add-error-message-if-txqueuelen-is-too-small.patch
queue-5.10/rpmsg-glink-release-driver_override.patch
queue-5.10/driver-platform-add-helper-for-safer-setting-of-driver_override.patch
queue-5.10/can-isotp-check-can-address-family-in-isotp_bind.patch
queue-5.10/rpmsg-fix-kfree-of-static-memory-on-setting-driver_override.patch
queue-5.10/can-isotp-add-local-echo-tx-processing-and-tx-without-fc.patch
queue-5.10/can-isotp-handle-wait_event_interruptible-return-values.patch
queue-5.10/rpmsg-fix-possible-refcount-leak-in-rpmsg_register_device_override.patch
queue-5.10/ext4-add-two-helper-functions-extent_logical_end-and-pa_logical_end.patch