diff options
| author | Giuliano Pochini <pochini@shiny.it> | 2006-03-13 16:11:11 +0300 |
|---|---|---|
| committer | Jaroslav Kysela <perex@suse.cz> | 2006-03-22 12:37:23 +0300 |
| commit | 646494007b48e8897888cd407c2b7d1d69cb2e58 (patch) | |
| tree | 02d72d5f844ecb0ce3c25b1b8401ca3b172fa866 /sound/core/control.c | |
| parent | 9230d2148a0c53188c216b446cf17ea213ebca8a (diff) | |
| download | linux-646494007b48e8897888cd407c2b7d1d69cb2e58.tar.xz | |
[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>
Diffstat (limited to 'sound/core/control.c')
| -rw-r--r-- | sound/core/control.c | 20 |
1 files changed, 17 insertions, 3 deletions
diff --git a/sound/core/control.c b/sound/core/control.c index 0c29679a8576..9742bdba0de1 100644 --- a/sound/core/control.c +++ b/sound/core/control.c @@ -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; |