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ASoC: dapm: Lock during userspace access

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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;
}