diff mbox series

[6/7] ALSA: pcm: Block the release until the system resume finishes

Message ID 20210518165201.24376-7-tiwai@suse.de
State Accepted
Commit 534a427bface78d682482ad66ce1a517522acc1d
Headers show
Series ALSA: Prep work for PCI rescan support | expand

Commit Message

Takashi Iwai May 18, 2021, 4:52 p.m. UTC 
The normal PCM operations are already blocked during the card power
off state in the PCM common ioctl handler, but the release isn't
covered.  As the PCM stream release may also access the hardware,
let's block the release until the card power turns on.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
---
 sound/core/pcm_native.c | 4 ++++
 1 file changed, 4 insertions(+)
diff mbox series

Patch

diff --git a/sound/core/pcm_native.c b/sound/core/pcm_native.c
index 8dbe86cf2e4f..3c6ba0dc2970 100644
--- a/sound/core/pcm_native.c
+++ b/sound/core/pcm_native.c
@@ -2799,6 +2799,10 @@  static int snd_pcm_release(struct inode *inode, struct file *file)
 	if (snd_BUG_ON(!substream))
 		return -ENXIO;
 	pcm = substream->pcm;
+
+	/* block until the device gets woken up as it may touch the hardware */
+	snd_power_wait(pcm->card, SNDRV_CTL_POWER_D0);
+
 	mutex_lock(&pcm->open_mutex);
 	snd_pcm_release_substream(substream);
 	kfree(pcm_file);