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.c | 20 +++++++++++++++++--- 1 file changed, 17 insertions(+), 3 deletions(-) (limited to 'sound/core/control.c') 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; -- cgit v1.2.1