From 646494007b48e8897888cd407c2b7d1d69cb2e58 Mon Sep 17 00:00:00 2001 From: Giuliano Pochini Date: Mon, 13 Mar 2006 14:11:11 +0100 Subject: [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 Signed-off-by: Takashi Iwai --- sound/core/control_compat.c | 33 +++++++++++++++++++++++++-------- 1 file changed, 25 insertions(+), 8 deletions(-) (limited to 'sound/core/control_compat.c') diff --git a/sound/core/control_compat.c b/sound/core/control_compat.c index a529b62972b..84fef5084e1 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; -- cgit v1.2.3