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ALSA: timer: Wrap with spinlock for queue access
For accessing the snd_timer_user queue indices, we take tu->qlock. But it's forgotten in a couple of places. The one in snd_timer_user_params() should be safe without the spinlock as the timer is already stopped. But it's better for consistency. The one in poll is just a read-out, so it's not inevitably needed, but it'd be good to make the result consistent, too. Tested-by: Alexander Potapenko <glider@google.com> Signed-off-by: Takashi Iwai <tiwai@suse.de>
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1 changed files with 4 additions and 0 deletions
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@ -1755,6 +1755,7 @@ static int snd_timer_user_params(struct file *file,
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if (err < 0)
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goto _end;
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}
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spin_lock_irq(&tu->qlock);
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tu->qhead = tu->qtail = tu->qused = 0;
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if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) {
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if (tu->tread) {
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@ -1775,6 +1776,7 @@ static int snd_timer_user_params(struct file *file,
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}
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tu->filter = params.filter;
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tu->ticks = params.ticks;
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spin_unlock_irq(&tu->qlock);
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err = 0;
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_end:
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if (copy_to_user(_params, ¶ms, sizeof(params)))
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@ -2022,10 +2024,12 @@ static unsigned int snd_timer_user_poll(struct file *file, poll_table * wait)
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poll_wait(file, &tu->qchange_sleep, wait);
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mask = 0;
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spin_lock_irq(&tu->qlock);
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if (tu->qused)
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mask |= POLLIN | POLLRDNORM;
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if (tu->disconnected)
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mask |= POLLERR;
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spin_unlock_irq(&tu->qlock);
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return mask;
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}
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