* [PATCH] can: slcan: do not sleep with a spin lock held
@ 2022-07-13 15:19 Dario Binacchi
2022-07-13 15:35 ` Greg Kroah-Hartman
0 siblings, 1 reply; 2+ messages in thread
From: Dario Binacchi @ 2022-07-13 15:19 UTC (permalink / raw)
To: linux-kernel
Cc: Richard Palethorpe, Jeroen Hofstee, Linux Memory Management List,
kernel test robot, lkp, lkp, ltp, Dario Binacchi,
David S. Miller, Eric Dumazet, Greg Kroah-Hartman,
Jakub Kicinski, Jiri Slaby, Marc Kleine-Budde, Paolo Abeni,
Sebastian Andrzej Siewior, Vincent Mailhol, Wolfgang Grandegger,
linux-can, netdev
We can't call close_candev() with a spin lock held, so release the lock
before calling it.
Fixes: c4e54b063f42f ("can: slcan: use CAN network device driver API")
Reported-by: kernel test robot <oliver.sang@intel.com>
Link: https://lore.kernel.org/linux-kernel/Ysrf1Yc5DaRGN1WE@xsang-OptiPlex-9020/
Signed-off-by: Dario Binacchi <dario.binacchi@amarulasolutions.com>
---
drivers/net/can/slcan/slcan-core.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/net/can/slcan/slcan-core.c b/drivers/net/can/slcan/slcan-core.c
index 54d29a410ad5..6aaf2986effc 100644
--- a/drivers/net/can/slcan/slcan-core.c
+++ b/drivers/net/can/slcan/slcan-core.c
@@ -688,6 +688,7 @@ static int slc_close(struct net_device *dev)
/* TTY discipline is running. */
clear_bit(TTY_DO_WRITE_WAKEUP, &sl->tty->flags);
}
+ spin_unlock_bh(&sl->lock);
netif_stop_queue(dev);
close_candev(dev);
sl->can.state = CAN_STATE_STOPPED;
@@ -696,7 +697,6 @@ static int slc_close(struct net_device *dev)
sl->rcount = 0;
sl->xleft = 0;
- spin_unlock_bh(&sl->lock);
return 0;
}
--
2.32.0
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] can: slcan: do not sleep with a spin lock held
2022-07-13 15:19 [PATCH] can: slcan: do not sleep with a spin lock held Dario Binacchi
@ 2022-07-13 15:35 ` Greg Kroah-Hartman
0 siblings, 0 replies; 2+ messages in thread
From: Greg Kroah-Hartman @ 2022-07-13 15:35 UTC (permalink / raw)
To: Dario Binacchi
Cc: linux-kernel, Richard Palethorpe, Jeroen Hofstee,
Linux Memory Management List, kernel test robot, lkp, lkp, ltp,
David S. Miller, Eric Dumazet, Jakub Kicinski, Jiri Slaby,
Marc Kleine-Budde, Paolo Abeni, Sebastian Andrzej Siewior,
Vincent Mailhol, Wolfgang Grandegger, linux-can, netdev
On Wed, Jul 13, 2022 at 05:19:47PM +0200, Dario Binacchi wrote:
> We can't call close_candev() with a spin lock held, so release the lock
> before calling it.
>
> Fixes: c4e54b063f42f ("can: slcan: use CAN network device driver API")
> Reported-by: kernel test robot <oliver.sang@intel.com>
> Link: https://lore.kernel.org/linux-kernel/Ysrf1Yc5DaRGN1WE@xsang-OptiPlex-9020/
> Signed-off-by: Dario Binacchi <dario.binacchi@amarulasolutions.com>
>
> ---
>
> drivers/net/can/slcan/slcan-core.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/net/can/slcan/slcan-core.c b/drivers/net/can/slcan/slcan-core.c
> index 54d29a410ad5..6aaf2986effc 100644
> --- a/drivers/net/can/slcan/slcan-core.c
> +++ b/drivers/net/can/slcan/slcan-core.c
> @@ -688,6 +688,7 @@ static int slc_close(struct net_device *dev)
> /* TTY discipline is running. */
> clear_bit(TTY_DO_WRITE_WAKEUP, &sl->tty->flags);
> }
> + spin_unlock_bh(&sl->lock);
> netif_stop_queue(dev);
Can you have a lock held when calling netif_stop_queue()? You don't
mention this in your changelog text :(
thanks,
greg k-h
^ permalink raw reply [flat|nested] 2+ messages in thread
end of thread, other threads:[~2022-07-13 15:36 UTC | newest]
Thread overview: 2+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2022-07-13 15:19 [PATCH] can: slcan: do not sleep with a spin lock held Dario Binacchi
2022-07-13 15:35 ` Greg Kroah-Hartman
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).