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ASoC: wm_adsp: Avoid calling snd_compr_stop_error from WDT expiry 

It is unsafe to call snd_compr_stop_error from outside of the
compressed ops. Firstly the compressed device lock needs to be held
and secondly it queues error work to issue a trigger stop which
should not happen after the stream has been freed. To avoid these
issues use the same trick used for the IRQ handling, simply send a
snd_compr_fragment_elapsed to cause user-space to wake on the poll,
then report the error when user-space issues the pointer request
after it wakes.

Fixes: a2bcbc1b9a ("ASoC: wm_adsp: Shutdown any compressed streams on DSP watchdog timeout")
Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Cc: stable@kernel.org
This commit is contained in:
Charles Keepax 2019-04-04 13:56:01 +01:00 committed by Mark Brown
parent fdf34366d3
commit aa612f2b00
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
1 changed files with 4 additions and 6 deletions
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10
sound/soc/codecs/wm_adsp.c
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@ -4092,7 +4092,7 @@ int wm_adsp_compr_pointer(struct snd_compr_stream *stream,
buf = compr->buf;
if (!buf || buf->error) {
if (dsp->fatal_error || !buf || buf->error) {
snd_compr_stop_error(stream, SNDRV_PCM_STATE_XRUN);
ret = -EIO;
goto out;
@ -4196,12 +4196,13 @@ static int wm_adsp_buffer_capture_block(struct wm_adsp_compr *compr, int target)
static int wm_adsp_compr_read(struct wm_adsp_compr *compr,
char __user *buf, size_t count)
{
struct wm_adsp *dsp = compr->dsp;
int ntotal = 0;
int nwords, nbytes;
compr_dbg(compr, "Requested read of %zu bytes\n", count);
if (!compr->buf || compr->buf->error) {
if (dsp->fatal_error || !compr->buf || compr->buf->error) {
snd_compr_stop_error(compr->stream, SNDRV_PCM_STATE_XRUN);
return -EIO;
}
@ -4262,11 +4263,8 @@ static void wm_adsp_fatal_error(struct wm_adsp *dsp)
dsp->fatal_error = true;
list_for_each_entry(compr, &dsp->compr_list, list) {
if (compr->stream) {
snd_compr_stop_error(compr->stream,
SNDRV_PCM_STATE_XRUN);
if (compr->stream)
snd_compr_fragment_elapsed(compr->stream);
}
}
}