[ALSA] make control.c suspend aware
Modules: Control Midlevel
This patch prevents user-space apps from accessing the hardware via
control interface while the soundcard is suspended.
Signed-off-by: Giuliano Pochini <pochini@shiny.it>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/core/control.c b/sound/core/control.c
index 0c29679..9742bdb 100644
--- a/sound/core/control.c
+++ b/sound/core/control.c
@@ -658,7 +658,11 @@
if (copy_from_user(&info, _info, sizeof(info)))
return -EFAULT;
- result = snd_ctl_elem_info(ctl, &info);
+ snd_power_lock(ctl->card);
+ result = snd_power_wait(ctl->card, SNDRV_CTL_POWER_D0, NULL);
+ if (result >= 0)
+ result = snd_ctl_elem_info(ctl, &info);
+ snd_power_unlock(ctl->card);
if (result >= 0)
if (copy_to_user(_info, &info, sizeof(info)))
return -EFAULT;
@@ -708,7 +712,11 @@
kfree(control);
return -EFAULT;
}
- result = snd_ctl_elem_read(card, control);
+ snd_power_lock(card);
+ result = snd_power_wait(card, SNDRV_CTL_POWER_D0, NULL);
+ if (result >= 0)
+ result = snd_ctl_elem_read(card, control);
+ snd_power_unlock(card);
if (result >= 0)
if (copy_to_user(_control, control, sizeof(*control)))
result = -EFAULT;
@@ -758,6 +766,7 @@
struct snd_ctl_elem_value __user *_control)
{
struct snd_ctl_elem_value *control;
+ struct snd_card *card;
int result;
control = kmalloc(sizeof(*control), GFP_KERNEL);
@@ -767,7 +776,12 @@
kfree(control);
return -EFAULT;
}
- result = snd_ctl_elem_write(file->card, file, control);
+ card = file->card;
+ snd_power_lock(card);
+ result = snd_power_wait(card, SNDRV_CTL_POWER_D0, NULL);
+ if (result >= 0)
+ result = snd_ctl_elem_write(card, file, control);
+ snd_power_unlock(card);
if (result >= 0)
if (copy_to_user(_control, control, sizeof(*control)))
result = -EFAULT;