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can: flexcan: only change CAN state when link up in system PM

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[ Upstream commit fd99d6ed20234b83d65b9c5417794343577cf3e5 ]

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: 4de349e786 ("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@pengutronix.de
[mkl: add newlines]
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Haibo Chen 2025-03-14 19:01:44 +08:00 • committed by Greg Kroah-Hartman
commit a1ef4447b8
1 changed files with 4 additions and 2 deletions
Download patch file Download diff file Expand all files Collapse all files

6
drivers/net/can/flexcan.c
View file

@ -1723,8 +1723,9 @@ 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 err;
}
@ -1735,7 +1736,6 @@ static int __maybe_unused flexcan_resume(struct device *device)
struct flexcan_priv *priv = netdev_priv(dev);
int err = 0;
priv->can.state = CAN_STATE_ERROR_ACTIVE;
if (netif_running(dev)) {
netif_device_attach(dev);
netif_start_queue(dev);
@ -1747,6 +1747,8 @@ static int __maybe_unused flexcan_resume(struct device *device)
} else {
err = flexcan_chip_enable(priv);
}
priv->can.state = CAN_STATE_ERROR_ACTIVE;
}
return err;