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[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>
This commit is contained in:
Giuliano Pochini 2006-03-13 14:11:11 +01:00 committed by Jaroslav Kysela
parent 9230d2148a
commit 646494007b
2 changed files with 42 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

20
sound/core/control.c
View File

@ -658,7 +658,11 @@ static int snd_ctl_elem_info_user(struct snd_ctl_file *ctl,
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 @@ static int snd_ctl_elem_read_user(struct snd_card *card,
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 @@ static int snd_ctl_elem_write_user(struct snd_ctl_file *file,
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 @@ static int snd_ctl_elem_write_user(struct snd_ctl_file *file,
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;

33
sound/core/control_compat.c
View File

@ -107,7 +107,13 @@ static int snd_ctl_elem_info_compat(struct snd_ctl_file *ctl,
*/
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 @@ static int snd_ctl_elem_read_user_compat(struct snd_card *card,
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 @@ static int snd_ctl_elem_write_user_compat(struct snd_ctl_file *file,
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;