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| author |   Takashi Iwai <tiwai@suse.de> | 2021-05-23 11:09:18 +0200 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2021-05-25 08:49:06 +0200 |
| commit | 968bb2baec60757ae86b4ee937561f5815488044 (patch) | |
| tree | 30f4458f4887ab9e2a008fe9c5b6a39bdd0949b0 /sound/core/control.c | |
| parent | ALSA: control: Drop superfluous snd_power_wait() calls (diff) | |
| download | wireguard-linux-968bb2baec60757ae86b4ee937561f5815488044.tar.xz wireguard-linux-968bb2baec60757ae86b4ee937561f5815488044.zip | |
ALSA: control: Minor optimization for SNDRV_CTL_IOCTL_POWER_STATE
Long long time ago, before the proper PM framework was introduced, it
was still possible to reach SNDRV_CTL_IOCTL_POWER ioctl during the
power off state. This ioctl existed as a main control for the suspend
resume state in the past, but the feature was already dropped along
with the standard PM framework. Now the read part,
SNDRV_IOCTL_POWER_STATE ioctl, returns practically always D0, and we
can do some minor optimization there.
Reviewed-by: Jaroslav Kysela <perex@perex.cz>
Link: https://lore.kernel.org/r/20210523090920.15345-5-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/core/control.c')
| -rw-r--r-- | sound/core/control.c | 4 |
1 files changed, 0 insertions, 4 deletions
diff --git a/sound/core/control.c b/sound/core/control.c index 7fe901384c9c..a25c0d64d104 100644 --- a/sound/core/control.c +++ b/sound/core/control.c @@ -1817,11 +1817,7 @@ static long snd_ctl_ioctl(struct file *file, unsigned int cmd, unsigned long arg case SNDRV_CTL_IOCTL_POWER: return -ENOPROTOOPT; case SNDRV_CTL_IOCTL_POWER_STATE: -#ifdef CONFIG_PM - return put_user(card->power_state, ip) ? -EFAULT : 0; -#else return put_user(SNDRV_CTL_POWER_D0, ip) ? -EFAULT : 0; -#endif } down_read(&snd_ioctl_rwsem); list_for_each_entry(p, &snd_control_ioctls, list) { |