This is a note to let you know that I've just added the patch titled
ASoC: soc-compress: Reposition and add pcm_mutex
to the 5.15-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-soc-compress-reposition-and-add-pcm_mutex.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 6eaae6683133c5cd1cdc498d015b8eadc8c70c3e
Author: 강신형 <s47.kang@xxxxxxxxxxx>
Date: Thu Dec 8 14:18:18 2022 +0900
ASoC: soc-compress: Reposition and add pcm_mutex
[ Upstream commit aa9ff6a4955fdba02b54fbc4386db876603703b7 ]
If panic_on_warn is set and compress stream(DPCM) is started,
then kernel panic occurred because card->pcm_mutex isn't held appropriately.
In the following functions, warning were issued at this line
"snd_soc_dpcm_mutex_assert_held".
static int dpcm_be_connect(struct snd_soc_pcm_runtime *fe,
struct snd_soc_pcm_runtime *be, int stream)
{
...
snd_soc_dpcm_mutex_assert_held(fe);
...
}
void dpcm_be_disconnect(struct snd_soc_pcm_runtime *fe, int stream)
{
...
snd_soc_dpcm_mutex_assert_held(fe);
...
}
void snd_soc_runtime_action(struct snd_soc_pcm_runtime *rtd,
int stream, int action)
{
...
snd_soc_dpcm_mutex_assert_held(rtd);
...
}
int dpcm_dapm_stream_event(struct snd_soc_pcm_runtime *fe, int dir,
int event)
{
...
snd_soc_dpcm_mutex_assert_held(fe);
...
}
These functions are called by soc_compr_set_params_fe, soc_compr_open_fe
and soc_compr_free_fe
without pcm_mutex locking. And this is call stack.
[ 414.527841][ T2179] pc : dpcm_process_paths+0x5a4/0x750
[ 414.527848][ T2179] lr : dpcm_process_paths+0x37c/0x750
[ 414.527945][ T2179] Call trace:
[ 414.527949][ T2179] dpcm_process_paths+0x5a4/0x750
[ 414.527955][ T2179] soc_compr_open_fe+0xb0/0x2cc
[ 414.527972][ T2179] snd_compr_open+0x180/0x248
[ 414.527981][ T2179] snd_open+0x15c/0x194
[ 414.528003][ T2179] chrdev_open+0x1b0/0x220
[ 414.528023][ T2179] do_dentry_open+0x30c/0x594
[ 414.528045][ T2179] vfs_open+0x34/0x44
[ 414.528053][ T2179] path_openat+0x914/0xb08
[ 414.528062][ T2179] do_filp_open+0xc0/0x170
[ 414.528068][ T2179] do_sys_openat2+0x94/0x18c
[ 414.528076][ T2179] __arm64_sys_openat+0x78/0xa4
[ 414.528084][ T2179] invoke_syscall+0x48/0x10c
[ 414.528094][ T2179] el0_svc_common+0xbc/0x104
[ 414.528099][ T2179] do_el0_svc+0x34/0xd8
[ 414.528103][ T2179] el0_svc+0x34/0xc4
[ 414.528125][ T2179] el0t_64_sync_handler+0x8c/0xfc
[ 414.528133][ T2179] el0t_64_sync+0x1a0/0x1a4
[ 414.528142][ T2179] Kernel panic - not syncing: panic_on_warn set ...
So, I reposition and add pcm_mutex to resolve lockdep error.
Signed-off-by: Shinhyung Kang <s47.kang@xxxxxxxxxxx>
Link: https://lore.kernel.org/r/016401d90ac4$7b6848c0$7238da40$@samsung.com
Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/sound/soc/soc-compress.c b/sound/soc/soc-compress.c
index e352b06a7b7a3..c2703a7598dd5 100644
--- a/sound/soc/soc-compress.c
+++ b/sound/soc/soc-compress.c
@@ -116,6 +116,8 @@ static int soc_compr_open_fe(struct snd_compr_stream *cstream)
if (ret < 0)
goto be_err;
+ mutex_lock_nested(&fe->card->pcm_mutex, fe->card->pcm_subclass);
+
/* calculate valid and active FE <-> BE dpcms */
dpcm_process_paths(fe, stream, &list, 1);
fe->dpcm[stream].runtime = fe_substream->runtime;
@@ -151,7 +153,6 @@ static int soc_compr_open_fe(struct snd_compr_stream *cstream)
fe->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN;
fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
- mutex_lock_nested(&fe->card->pcm_mutex, fe->card->pcm_subclass);
snd_soc_runtime_activate(fe, stream);
mutex_unlock(&fe->card->pcm_mutex);
@@ -182,7 +183,6 @@ static int soc_compr_free_fe(struct snd_compr_stream *cstream)
mutex_lock_nested(&fe->card->pcm_mutex, fe->card->pcm_subclass);
snd_soc_runtime_deactivate(fe, stream);
- mutex_unlock(&fe->card->pcm_mutex);
fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
@@ -201,6 +201,8 @@ static int soc_compr_free_fe(struct snd_compr_stream *cstream)
dpcm_be_disconnect(fe, stream);
+ mutex_unlock(&fe->card->pcm_mutex);
+
fe->dpcm[stream].runtime = NULL;
snd_soc_link_compr_shutdown(cstream, 0);
@@ -376,8 +378,9 @@ static int soc_compr_set_params_fe(struct snd_compr_stream *cstream,
ret = snd_soc_link_compr_set_params(cstream);
if (ret < 0)
goto out;
-
+ mutex_lock_nested(&fe->card->pcm_mutex, fe->card->pcm_subclass);
dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_START);
+ mutex_unlock(&fe->card->pcm_mutex);
fe->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE;
out:
