ALSA: PCM: Allow resume only for suspended streams

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

Link: https://patch.msgid.link/[email protected]
Signed-off-by: Takashi Iwai <[email protected]>

Author: tiwai

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;