6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Ivan Orlov <ivan.orlov0322@xxxxxxxxx> [ Upstream commit eb99b1b72a424a79f56c972e0fd7ad01fe93a008 ] Stop timer in the 'trigger' and 'sync_stop' callbacks since we want the timer to be stopped before the DMA buffer is released. Otherwise, it could trigger a kernel panic in some circumstances, for instance when the DMA buffer is already released but the timer callback is still running. Signed-off-by: Ivan Orlov <ivan.orlov0322@xxxxxxxxx> Link: https://lore.kernel.org/r/20231206223211.12761-1-ivan.orlov0322@xxxxxxxxx Signed-off-by: Takashi Iwai <tiwai@xxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> --- sound/drivers/pcmtest.c | 13 ++++++++++++- 1 file changed, 12 insertions(+), 1 deletion(-) diff --git a/sound/drivers/pcmtest.c b/sound/drivers/pcmtest.c index b59b78a09224..b8bff5522bce 100644 --- a/sound/drivers/pcmtest.c +++ b/sound/drivers/pcmtest.c @@ -397,7 +397,6 @@ static int snd_pcmtst_pcm_close(struct snd_pcm_substream *substream) struct pcmtst_buf_iter *v_iter = substream->runtime->private_data; timer_shutdown_sync(&v_iter->timer_instance); - v_iter->substream = NULL; playback_capture_test = !v_iter->is_buf_corrupted; kfree(v_iter); return 0; @@ -435,6 +434,7 @@ static int snd_pcmtst_pcm_trigger(struct snd_pcm_substream *substream, int cmd) case SNDRV_PCM_TRIGGER_PAUSE_PUSH: // We can't call timer_shutdown_sync here, as it is forbidden to sleep here v_iter->suspend = true; + timer_delete(&v_iter->timer_instance); break; } @@ -512,12 +512,22 @@ static int snd_pcmtst_ioctl(struct snd_pcm_substream *substream, unsigned int cm return snd_pcm_lib_ioctl(substream, cmd, arg); } +static int snd_pcmtst_sync_stop(struct snd_pcm_substream *substream) +{ + struct pcmtst_buf_iter *v_iter = substream->runtime->private_data; + + timer_delete_sync(&v_iter->timer_instance); + + return 0; +} + static const struct snd_pcm_ops snd_pcmtst_playback_ops = { .open = snd_pcmtst_pcm_open, .close = snd_pcmtst_pcm_close, .trigger = snd_pcmtst_pcm_trigger, .hw_params = snd_pcmtst_pcm_hw_params, .ioctl = snd_pcmtst_ioctl, + .sync_stop = snd_pcmtst_sync_stop, .hw_free = snd_pcmtst_pcm_hw_free, .prepare = snd_pcmtst_pcm_prepare, .pointer = snd_pcmtst_pcm_pointer, @@ -530,6 +540,7 @@ static const struct snd_pcm_ops snd_pcmtst_capture_ops = { .hw_params = snd_pcmtst_pcm_hw_params, .hw_free = snd_pcmtst_pcm_hw_free, .ioctl = snd_pcmtst_ioctl, + .sync_stop = snd_pcmtst_sync_stop, .prepare = snd_pcmtst_pcm_prepare, .pointer = snd_pcmtst_pcm_pointer, }; -- 2.43.0
