diff options
| author | Takashi Sakamoto <o-takashi@sakamocchi.jp> | 2020-01-13 17:57:19 +0900 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2020-01-13 10:41:01 +0100 |
| commit | 747d1f076de5a60770011f6e512de43298ec64cb (patch) | |
| tree | f2d12eb89a5f310d2e45d8a63720d9ce773ae9a7 | |
| parent | 7fba6aea4472f01a404d81a12237ae9a1ff418ce (diff) | |
ALSA: firewire-tascam: fix corruption due to spin lock without restoration in SoftIRQ context
ALSA firewire-tascam driver can bring corruption due to spin lock without
restoration of IRQ flag in SoftIRQ context. This commit fixes the bug.
Cc: Scott Bahling <sbahling@suse.com>
Cc: <stable@vger.kernel.org> # v4.21
Fixes: d7167422433c ("ALSA: firewire-tascam: queue events for change of control surface")
Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Link: https://lore.kernel.org/r/20200113085719.26788-1-o-takashi@sakamocchi.jp
Signed-off-by: Takashi Iwai <tiwai@suse.de>
| -rw-r--r-- | sound/firewire/tascam/amdtp-tascam.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/sound/firewire/tascam/amdtp-tascam.c b/sound/firewire/tascam/amdtp-tascam.c index e80bb84c43f6..f823a2ab3544 100644 --- a/sound/firewire/tascam/amdtp-tascam.c +++ b/sound/firewire/tascam/amdtp-tascam.c @@ -157,14 +157,15 @@ static void read_status_messages(struct amdtp_stream *s, if ((before ^ after) & mask) { struct snd_firewire_tascam_change *entry = &tscm->queue[tscm->push_pos]; + unsigned long flag; - spin_lock_irq(&tscm->lock); + spin_lock_irqsave(&tscm->lock, flag); entry->index = index; entry->before = before; entry->after = after; if (++tscm->push_pos >= SND_TSCM_QUEUE_COUNT) tscm->push_pos = 0; - spin_unlock_irq(&tscm->lock); + spin_unlock_irqrestore(&tscm->lock, flag); wake_up(&tscm->hwdep_wait); } |