This is a note to let you know that I've just added the patch titled
ALSA: usb-audio: Suppress repetitive debug messages from retire_playback_urb()
to the 3.14-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
alsa-usb-audio-suppress-repetitive-debug-messages-from-retire_playback_urb.patch
and it can be found in the queue-3.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From a5065eb6da55b226661456e6a7435f605df98111 Mon Sep 17 00:00:00 2001
From: Tim Gardner <tim.gardner@xxxxxxxxxxxxx>
Date: Wed, 9 Apr 2014 11:30:44 -0600
Subject: ALSA: usb-audio: Suppress repetitive debug messages from retire_playback_urb()
From: Tim Gardner <tim.gardner@xxxxxxxxxxxxx>
commit a5065eb6da55b226661456e6a7435f605df98111 upstream.
BugLink: http://bugs.launchpad.net/bugs/1305133
Malfunctioning or slow devices can cause a flood of dmesg SPAM.
I've ignored checkpatch.pl complaints about the use of printk_ratelimit() in favour
of prior art in sound/usb/pcm.c.
WARNING: Prefer printk_ratelimited or pr_<level>_ratelimited to printk_ratelimit
+ if (printk_ratelimit() &&
Cc: Jaroslav Kysela <perex@xxxxxxxx>
Cc: Takashi Iwai <tiwai@xxxxxxx>
Cc: Eldad Zack <eldad@xxxxxxxxxxxxxxx>
Cc: Daniel Mack <zonque@xxxxxxxxx>
Cc: Clemens Ladisch <clemens@xxxxxxxxxx>
Signed-off-by: Tim Gardner <tim.gardner@xxxxxxxxxxxxx>
Signed-off-by: Takashi Iwai <tiwai@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
sound/usb/pcm.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/sound/usb/pcm.c
+++ b/sound/usb/pcm.c
@@ -1487,7 +1487,8 @@ static void retire_playback_urb(struct s
* The error should be lower than 2ms since the estimate relies
* on two reads of a counter updated every ms.
*/
- if (abs(est_delay - subs->last_delay) * 1000 > runtime->rate * 2)
+ if (printk_ratelimit() &&
+ abs(est_delay - subs->last_delay) * 1000 > runtime->rate * 2)
snd_printk(KERN_DEBUG "delay: estimated %d, actual %d\n",
est_delay, subs->last_delay);
Patches currently in stable-queue which might be from tim.gardner@xxxxxxxxxxxxx are
queue-3.14/alsa-usb-audio-suppress-repetitive-debug-messages-from-retire_playback_urb.patch
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