[ALSA] Fix possible races in timer callbacks

Fix possible races in timer callbacks.

Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 3 insertions, 2 deletions

diff --git a/sound/synth/emux/emux_synth.c b/sound/synth/emux/emux_synth.c
index c387a83a655e..24705d15ebd8 100644
--- a/sound/synth/emux/emux_synth.c
+++ b/sound/synth/emux/emux_synth.c
@@ -205,9 +205,10 @@ void snd_emux_timer_callback(unsigned long data)
 {
         struct snd_emux *emu = (struct snd_emux *) data;
         struct snd_emux_voice *vp;
+        unsigned long flags;
         int ch, do_again = 0;
 
-        spin_lock(&emu->voice_lock);
+        spin_lock_irqsave(&emu->voice_lock, flags);
         for (ch = 0; ch < emu->max_voices; ch++) {
                 vp = &emu->voices[ch];
                 if (vp->state == SNDRV_EMUX_ST_PENDING) {
@@ -225,7 +226,7 @@ void snd_emux_timer_callback(unsigned long data)
                 emu->timer_active = 1;
         } else
                 emu->timer_active = 0;
-        spin_unlock(&emu->voice_lock);
+        spin_unlock_irqrestore(&emu->voice_lock, flags);
 }
 
 /*