This is a note to let you know that I've just added the patch titled
ASoC: dapm: Lock during userspace access
to the 4.1-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
asoc-dapm-lock-during-userspace-access.patch
and it can be found in the queue-4.1 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From e50b1e06b79e9d51efbff9627b4dd407184ef43f Mon Sep 17 00:00:00 2001
From: Lars-Peter Clausen <lars@xxxxxxxxxx>
Date: Mon, 6 Jul 2015 17:01:24 +0200
Subject: ASoC: dapm: Lock during userspace access
From: Lars-Peter Clausen <lars@xxxxxxxxxx>
commit e50b1e06b79e9d51efbff9627b4dd407184ef43f upstream.
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@xxxxxxxxxx>
Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
sound/soc/soc-dapm.c | 9 +++++++++
1 file changed, 9 insertions(+)
--- a/sound/soc/soc-dapm.c
+++ b/sound/soc/soc-dapm.c
@@ -1811,6 +1811,7 @@ static ssize_t dapm_widget_power_read_fi
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;
@@ -1820,6 +1821,8 @@ static ssize_t dapm_widget_power_read_fi
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;
@@ -1866,6 +1869,8 @@ static ssize_t dapm_widget_power_read_fi
p->sink->name);
}
+ mutex_unlock(&card->dapm_mutex);
+
ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
kfree(buf);
@@ -2140,11 +2145,15 @@ static ssize_t dapm_widget_show(struct d
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;
}
Patches currently in stable-queue which might be from lars@xxxxxxxxxx are
queue-4.1/asoc-dapm-lock-during-userspace-access.patch
queue-4.1/dmaengine-pl330-really-fix-choppy-sound-because-of-wrong-residue-calculation.patch
queue-4.1/asoc-dapm-don-t-add-prefix-to-widget-stream-name.patch
queue-4.1/asoc-ssm4567-keep-tdm_bclks-in-ssm4567_set_dai_fmt.patch
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