[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_compat.c b/sound/core/control_compat.c
index a529b62..84fef50 100644
--- a/sound/core/control_compat.c
+++ b/sound/core/control_compat.c
@@ -107,7 +107,13 @@
*/
if (get_user(data->value.enumerated.item, &data32->value.enumerated.item))
goto error;
- err = snd_ctl_elem_info(ctl, data);
+
+ snd_power_lock(ctl->card);
+ err = snd_power_wait(ctl->card, SNDRV_CTL_POWER_D0, NULL);
+ if (err >= 0)
+ err = snd_ctl_elem_info(ctl, data);
+ snd_power_unlock(ctl->card);
+
if (err < 0)
goto error;
/* restore info to 32bit */
@@ -286,9 +292,14 @@
if ((err = copy_ctl_value_from_user(card, data, data32, &type, &count)) < 0)
goto error;
- if ((err = snd_ctl_elem_read(card, data)) < 0)
- goto error;
- err = copy_ctl_value_to_user(data32, data, type, count);
+
+ snd_power_lock(card);
+ err = snd_power_wait(card, SNDRV_CTL_POWER_D0, NULL);
+ if (err >= 0)
+ err = snd_ctl_elem_read(card, data);
+ snd_power_unlock(card);
+ if (err >= 0)
+ err = copy_ctl_value_to_user(data32, data, type, count);
error:
kfree(data);
return err;
@@ -298,17 +309,23 @@
struct snd_ctl_elem_value32 __user *data32)
{
struct snd_ctl_elem_value *data;
+ struct snd_card *card = file->card;
int err, type, count;
data = kzalloc(sizeof(*data), GFP_KERNEL);
if (data == NULL)
return -ENOMEM;
- if ((err = copy_ctl_value_from_user(file->card, data, data32, &type, &count)) < 0)
+ if ((err = copy_ctl_value_from_user(card, data, data32, &type, &count)) < 0)
goto error;
- if ((err = snd_ctl_elem_write(file->card, file, data)) < 0)
- goto error;
- err = copy_ctl_value_to_user(data32, data, type, count);
+
+ snd_power_lock(card);
+ err = snd_power_wait(card, SNDRV_CTL_POWER_D0, NULL);
+ if (err >= 0)
+ err = snd_ctl_elem_write(card, file, data);
+ snd_power_unlock(card);
+ if (err >= 0)
+ err = copy_ctl_value_to_user(data32, data, type, count);
error:
kfree(data);
return err;