diff options
| author | Alexander Stein <alexander.stein@systec-electronic.com> | 2014-04-15 18:51:04 +0400 |
|---|---|---|
| committer | Marc Kleine-Budde <mkl@pengutronix.de> | 2014-04-25 00:32:41 +0400 |
| commit | 367525c8c20a34560afe1d0c7cca52a44ccd62e9 (patch) | |
| tree | a3b6a6a27106b2776af034c87b4d0f2bc2c6ec42 /drivers/net/can/slcan.c | |
| parent | d482443244b820f03a5a07d1bca6a0f5e2b4804c (diff) | |
| download | linux-367525c8c20a34560afe1d0c7cca52a44ccd62e9.tar.xz | |
can: slcan: Fix spinlock variant
slc_xmit is called within softirq context and locks sl->lock, but
slcan_write_wakeup is not softirq context, so we need to use
spin_[un]lock_bh!
Detected using kernel lock debugging mechanism.
Signed-off-by: Alexander Stein <alexander.stein@systec-electronic.com>
Acked-by: Oliver Hartkopp <socketcan@hartkopp.net>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Diffstat (limited to 'drivers/net/can/slcan.c')
| -rw-r--r-- | drivers/net/can/slcan.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/net/can/slcan.c b/drivers/net/can/slcan.c index f5b16e0e3a12..dcf9196f6316 100644 --- a/drivers/net/can/slcan.c +++ b/drivers/net/can/slcan.c @@ -322,13 +322,13 @@ static void slcan_write_wakeup(struct tty_struct *tty) if (!sl || sl->magic != SLCAN_MAGIC || !netif_running(sl->dev)) return; - spin_lock(&sl->lock); + spin_lock_bh(&sl->lock); if (sl->xleft <= 0) { /* Now serial buffer is almost free & we can start * transmission of another packet */ sl->dev->stats.tx_packets++; clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags); - spin_unlock(&sl->lock); + spin_unlock_bh(&sl->lock); netif_wake_queue(sl->dev); return; } @@ -336,7 +336,7 @@ static void slcan_write_wakeup(struct tty_struct *tty) actual = tty->ops->write(tty, sl->xhead, sl->xleft); sl->xleft -= actual; sl->xhead += actual; - spin_unlock(&sl->lock); + spin_unlock_bh(&sl->lock); } /* Send a can_frame to a TTY queue. */ |