[PATCH] ALSA: PCM: Allow resume only for suspended streams

[Takashi Iwai <tiwai@xxxxxxx>]

snd_pcm_resume() should bail out if the stream isn't in a suspended
state.  Otherwise it'd allow doubly resume.

Signed-off-by: Takashi Iwai <tiwai@xxxxxxx>
---
 sound/core/pcm_native.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/sound/core/pcm_native.c b/sound/core/pcm_native.c
index 521ba56392a0..c152ccf32214 100644
--- a/sound/core/pcm_native.c
+++ b/sound/core/pcm_native.c
@@ -1775,6 +1775,8 @@ static int snd_pcm_pre_resume(struct snd_pcm_substream *substream,
 			      snd_pcm_state_t state)
 {
 	struct snd_pcm_runtime *runtime = substream->runtime;
+	if (runtime->state != SNDRV_PCM_STATE_SUSPENDED)
+		return -EBADFD;
 	if (!(runtime->info & SNDRV_PCM_INFO_RESUME))
 		return -ENOSYS;
 	runtime->trigger_master = substream;
-- 
2.43.0