The patch below does not apply to the 4.19-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.
To reproduce the conflict and resubmit, you may use the following commands:
git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-4.19.y git checkout FETCH_HEAD git cherry-pick -x ccbfcac05866ebe6eb3bc6d07b51d4ed4fcde436 # <resolve conflicts, build, test, etc.> git commit -s git send-email --to 'stable@vger.kernel.org' --in-reply-to '2024081931-improvise-purgatory-bbe3@gregkh' --subject-prefix 'PATCH 4.19.y' HEAD^..
Possible dependencies:
ccbfcac05866 ("ALSA: timer: Relax start tick time check for slave timer elements") 4a63bd179fa8 ("ALSA: timer: Set lower bound of start tick time")
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From ccbfcac05866ebe6eb3bc6d07b51d4ed4fcde436 Mon Sep 17 00:00:00 2001 From: Takashi Iwai tiwai@suse.de Date: Sat, 10 Aug 2024 10:48:32 +0200 Subject: [PATCH] ALSA: timer: Relax start tick time check for slave timer elements
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
diff --git a/sound/core/timer.c b/sound/core/timer.c index d104adc75a8b..71a07c1662f5 100644 --- a/sound/core/timer.c +++ b/sound/core/timer.c @@ -547,7 +547,7 @@ static int snd_timer_start1(struct snd_timer_instance *timeri, /* 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) return -EINVAL; }