[PATCH v2] can: slcan: do not sleep with a spin lock held

[Dario Binacchi]

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@xxxxxxxxx>
Link: https://lore.kernel.org/linux-kernel/Ysrf1Yc5DaRGN1WE@xsang-OptiPlex-9020/
Signed-off-by: Dario Binacchi <dario.binacchi@xxxxxxxxxxxxxxxxxxxx>

---

Changes in v2:
- Release the lock just before calling the close_candev().

 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..5214421dedf3 100644
--- a/drivers/net/can/slcan/slcan-core.c
+++ b/drivers/net/can/slcan/slcan-core.c
@@ -689,6 +689,7 @@ static int slc_close(struct net_device *dev)
 		clear_bit(TTY_DO_WRITE_WAKEUP, &sl->tty->flags);
 	}
 	netif_stop_queue(dev);
+	spin_unlock_bh(&sl->lock);
 	close_candev(dev);
 	sl->can.state = CAN_STATE_STOPPED;
 	if (sl->can.bittiming.bitrate == CAN_BITRATE_UNKNOWN)
@@ -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