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| author | Giuliano Pochini <pochini@shiny.it> | 2006-03-13 14:11:11 +0100 |
|---|---|---|
| committer | Jaroslav Kysela <perex@suse.cz> | 2006-03-22 10:37:23 +0100 |
| commit | 646494007b48e8897888cd407c2b7d1d69cb2e58 (patch) | |
| tree | 02d72d5f844ecb0ce3c25b1b8401ca3b172fa866 /sound/core/control_compat.c | |
| parent | 9230d2148a0c53188c216b446cf17ea213ebca8a (diff) | |
| download | lwn-646494007b48e8897888cd407c2b7d1d69cb2e58.tar.gz lwn-646494007b48e8897888cd407c2b7d1d69cb2e58.zip | |
[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_compat.c')
| -rw-r--r-- | sound/core/control_compat.c | 33 |
1 files changed, 25 insertions, 8 deletions
diff --git a/sound/core/control_compat.c b/sound/core/control_compat.c index a529b62972b4..84fef5084e17 100644 --- a/sound/core/control_compat.c +++ b/sound/core/control_compat.c @@ -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) - goto error; - if ((err = snd_ctl_elem_write(file->card, file, data)) < 0) + if ((err = copy_ctl_value_from_user(card, data, data32, &type, &count)) < 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; |