The patch below does not apply to the 5.4-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.4.y git checkout FETCH_HEAD git cherry-pick -x fd99d6ed20234b83d65b9c5417794343577cf3e5 # <resolve conflicts, build, test, etc.> git commit -s git send-email --to 'stable@vger.kernel.org' --in-reply-to '2025032408-modular-regally-492c@gregkh' --subject-prefix 'PATCH 5.4.y' HEAD^..

Possible dependencies:

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From fd99d6ed20234b83d65b9c5417794343577cf3e5 Mon Sep 17 00:00:00 2001 From: Haibo Chen haibo.chen@nxp.com Date: Fri, 14 Mar 2025 19:01:44 +0800 Subject: [PATCH] can: flexcan: only change CAN state when link up in system PM

After a suspend/resume cycle on a down interface, it will come up as ERROR-ACTIVE.

$ ip -details -s -s a s dev flexcan0 3: flexcan0: <NOARP,ECHO> mtu 16 qdisc pfifo_fast state DOWN group default qlen 10 link/can promiscuity 0 allmulti 0 minmtu 0 maxmtu 0 can state STOPPED (berr-counter tx 0 rx 0) restart-ms 1000

$ sudo systemctl suspend

$ ip -details -s -s a s dev flexcan0 3: flexcan0: <NOARP,ECHO> mtu 16 qdisc pfifo_fast state DOWN group default qlen 10 link/can promiscuity 0 allmulti 0 minmtu 0 maxmtu 0 can state ERROR-ACTIVE (berr-counter tx 0 rx 0) restart-ms 1000

And only set CAN state to CAN_STATE_ERROR_ACTIVE when resume process has no issue, otherwise keep in CAN_STATE_SLEEPING as suspend did.

Fixes: 4de349e786a3 ("can: flexcan: fix resume function") Cc: stable@vger.kernel.org Signed-off-by: Haibo Chen haibo.chen@nxp.com Link: https://patch.msgid.link/20250314110145.899179-1-haibo.chen@nxp.com Reported-by: Marc Kleine-Budde mkl@pengutronix.de Closes: https://lore.kernel.org/all/20250314-married-polar-elephant-b15594-mkl@pengu... [mkl: add newlines] Signed-off-by: Marc Kleine-Budde mkl@pengutronix.de

diff --git a/drivers/net/can/flexcan/flexcan-core.c b/drivers/net/can/flexcan/flexcan-core.c index ac1a860986df..3a71fd235722 100644 --- a/drivers/net/can/flexcan/flexcan-core.c +++ b/drivers/net/can/flexcan/flexcan-core.c @@ -2266,8 +2266,9 @@ static int __maybe_unused flexcan_suspend(struct device *device) } netif_stop_queue(dev); netif_device_detach(dev); + + priv->can.state = CAN_STATE_SLEEPING; } - priv->can.state = CAN_STATE_SLEEPING;

return 0; } @@ -2278,7 +2279,6 @@ static int __maybe_unused flexcan_resume(struct device *device) struct flexcan_priv *priv = netdev_priv(dev); int err;

- priv->can.state = CAN_STATE_ERROR_ACTIVE; if (netif_running(dev)) { netif_device_attach(dev); netif_start_queue(dev); @@ -2298,6 +2298,8 @@ static int __maybe_unused flexcan_resume(struct device *device)

flexcan_chip_interrupts_enable(dev); } + + priv->can.state = CAN_STATE_ERROR_ACTIVE; }

return 0;