4.19-stable review patch. If anyone has any objections, please let me know.
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From: Takashi Iwai tiwai@suse.de
commit ccbfcac05866ebe6eb3bc6d07b51d4ed4fcde436 upstream.
The recent addition of a sanity check for a too low start tick time seems breaking some applications that uses aloop with a certain slave timer setup. They may have the initial resolution 0, hence it's treated as if it were a too low value.
Relax and skip the check for the slave timer instance for addressing the regression.
Fixes: 4a63bd179fa8 ("ALSA: timer: Set lower bound of start tick time") Cc: stable@vger.kernel.org Link: https://github.com/raspberrypi/linux/issues/6294 Link: https://patch.msgid.link/20240810084833.10939-1-tiwai@suse.de Signed-off-by: Takashi Iwai tiwai@suse.de Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- sound/core/timer.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/sound/core/timer.c +++ b/sound/core/timer.c @@ -532,7 +532,7 @@ static int snd_timer_start1(struct snd_t /* check the actual time for the start tick; * bail out as error if it's way too low (< 100us) */ - if (start) { + if (start && !(timer->hw.flags & SNDRV_TIMER_HW_SLAVE)) { if ((u64)snd_timer_hw_resolution(timer) * ticks < 100000) { result = -EINVAL; goto unlock;