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ALSA: core: pass audio tstamp config from userspace

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Let userspace select audio timestamp config when the
STATUS_EXT ioctl is used, ignore and zero all
other fields
No change for the existing STATUS ioctl, parameters
are treated as read-only.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Pierre-Louis Bossart 2015-02-13 15:14:04 -06:00 committed by Takashi Iwai
parent 229d043096
commit 38ca2a4d58
1 changed files with 14 additions and 3 deletions
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17
sound/core/pcm_native.c
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@ -753,12 +753,21 @@ int snd_pcm_status(struct snd_pcm_substream *substream,
}
static int snd_pcm_status_user(struct snd_pcm_substream *substream,
struct snd_pcm_status __user * _status)
struct snd_pcm_status __user * _status,
bool ext)
{
struct snd_pcm_status status;
int res;
memset(&status, 0, sizeof(status));
/*
* with extension, parameters are read/write,
* get audio_tstamp_data from user,
* ignore rest of status structure
*/
if (ext && get_user(status.audio_tstamp_data,
(u32 __user *)(&_status->audio_tstamp_data)))
return -EFAULT;
res = snd_pcm_status(substream, &status);
if (res < 0)
return res;
@ -2723,7 +2732,9 @@ static int snd_pcm_common_ioctl1(struct file *file,
case SNDRV_PCM_IOCTL_SW_PARAMS:
return snd_pcm_sw_params_user(substream, arg);
case SNDRV_PCM_IOCTL_STATUS:
return snd_pcm_status_user(substream, arg);
return snd_pcm_status_user(substream, arg, false);
case SNDRV_PCM_IOCTL_STATUS_EXT:
return snd_pcm_status_user(substream, arg, true);
case SNDRV_PCM_IOCTL_CHANNEL_INFO:
return snd_pcm_channel_info_user(substream, arg);
case SNDRV_PCM_IOCTL_PREPARE: