ALSA: pcm: Block the release until the system resume finishes

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.

Reviewed-by: Jaroslav Kysela <perex@perex.cz>
Link: https://lore.kernel.org/r/20210523090920.15345-7-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/sound/core/pcm_native.c b/sound/core/pcm_native.c
index 82f80d0..11acea0 100644 (file)
--- 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);
+
        mutex_lock(&pcm->open_mutex);
        snd_pcm_release_substream(substream);
        kfree(pcm_file);