From: Pattara Teerapong pteerapong@chromium.org
stable inclusion from stable-v5.10.143 commit ab730d3c44918f5cb9b2abc1e463cd0b80bfaa94 category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I6D0U6
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...
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commit 3e48940abee88b8dbbeeaf8a07e7b2b6be1271b3 upstream.
In loopback_jiffies_timer_pos_update(), we are getting jiffies twice. First time for playback, second time for capture. Jiffies can be updated between these two calls and if the capture jiffies is larger, extra zeros will be filled in the capture buffer.
Change to get jiffies once and use it for both playback and capture.
Signed-off-by: Pattara Teerapong pteerapong@chromium.org Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/20220901144036.4049060-1-pteerapong@chromium.org Signed-off-by: Takashi Iwai tiwai@suse.de Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Jialin Zhang zhangjialin11@huawei.com Reviewed-by: Zheng Zengkai zhengzengkai@huawei.com --- sound/drivers/aloop.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-)
diff --git a/sound/drivers/aloop.c b/sound/drivers/aloop.c index 2c5f7e905ab8..fb45a32d99cd 100644 --- a/sound/drivers/aloop.c +++ b/sound/drivers/aloop.c @@ -606,17 +606,18 @@ static unsigned int loopback_jiffies_timer_pos_update cable->streams[SNDRV_PCM_STREAM_PLAYBACK]; struct loopback_pcm *dpcm_capt = cable->streams[SNDRV_PCM_STREAM_CAPTURE]; - unsigned long delta_play = 0, delta_capt = 0; + unsigned long delta_play = 0, delta_capt = 0, cur_jiffies; unsigned int running, count1, count2;
+ cur_jiffies = jiffies; running = cable->running ^ cable->pause; if (running & (1 << SNDRV_PCM_STREAM_PLAYBACK)) { - delta_play = jiffies - dpcm_play->last_jiffies; + delta_play = cur_jiffies - dpcm_play->last_jiffies; dpcm_play->last_jiffies += delta_play; }
if (running & (1 << SNDRV_PCM_STREAM_CAPTURE)) { - delta_capt = jiffies - dpcm_capt->last_jiffies; + delta_capt = cur_jiffies - dpcm_capt->last_jiffies; dpcm_capt->last_jiffies += delta_capt; }