ALSA: remove unneeded power_mutex lock in snd_pcm_drop

The power_mutex lock in snd_pcm_drop may cause a possible deadlock
chain, and above all, it's unneeded.  Let's get rid of it.

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

diff --git a/sound/core/pcm_native.c b/sound/core/pcm_native.c
index c49b9d9..c487025 100644 (file)
--- a/sound/core/pcm_native.c
+++ b/sound/core/pcm_native.c
@@ -1546,16 +1546,10 @@ static int snd_pcm_drop(struct snd_pcm_substream *substream)
        card = substream->pcm->card;
 
        if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
-           runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED)
+           runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED ||
+           runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
                return -EBADFD;
 
-       snd_power_lock(card);
-       if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
-               result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
-               if (result < 0)
-                       goto _unlock;
-       }
-
        snd_pcm_stream_lock_irq(substream);
        /* resume pause */
        if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
@@ -1564,8 +1558,7 @@ static int snd_pcm_drop(struct snd_pcm_substream *substream)
        snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
        /* runtime->control->appl_ptr = runtime->status->hw_ptr; */
        snd_pcm_stream_unlock_irq(substream);
- _unlock:
-       snd_power_unlock(card);
+
        return result;
 }