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ASoC: dapm: Lock during userspace access 

The DAPM lock must be held when accessing the DAPM graph status through
sysfs or debugfs, otherwise concurrent changes to the graph can result in
undefined behaviour.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Mark Brown <broonie@kernel.org>
Cc: stable@vger.kernel.org
This commit is contained in:
Lars-Peter Clausen 2015-07-06 17:01:24 +02:00 committed by Mark Brown
parent ffacb48e5a
commit e50b1e06b7
1 changed files with 9 additions and 0 deletions
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9
sound/soc/soc-dapm.c
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@ -1952,6 +1952,7 @@ static ssize_t dapm_widget_power_read_file(struct file *file,
size_t count, loff_t *ppos)
{
struct snd_soc_dapm_widget *w = file->private_data;
struct snd_soc_card *card = w->dapm->card;
char *buf;
int in, out;
ssize_t ret;
@ -1961,6 +1962,8 @@ static ssize_t dapm_widget_power_read_file(struct file *file,
if (!buf)
return -ENOMEM;
mutex_lock(&card->dapm_mutex);
/* Supply widgets are not handled by is_connected_{input,output}_ep() */
if (w->is_supply) {
in = 0;
@ -2007,6 +2010,8 @@ static ssize_t dapm_widget_power_read_file(struct file *file,
p->sink->name);
}
mutex_unlock(&card->dapm_mutex);
ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
kfree(buf);
@ -2281,11 +2286,15 @@ static ssize_t dapm_widget_show(struct device *dev,
struct snd_soc_pcm_runtime *rtd = dev_get_drvdata(dev);
int i, count = 0;
mutex_lock(&rtd->card->dapm_mutex);
for (i = 0; i < rtd->num_codecs; i++) {
struct snd_soc_codec *codec = rtd->codec_dais[i]->codec;
count += dapm_widget_show_codec(codec, buf + count);
}
mutex_unlock(&rtd->card->dapm_mutex);
return count;
}