| From | Jiri Slaby <> | Subject | [PATCH 3.12 123/170] ALSA: usb-audio: Suppress repetitive debug messages from retire_playback_urb() | Date | Fri, 18 Jul 2014 14:12:08 +0200 |
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From: Tim Gardner <tim.gardner@canonical.com>
3.12-stable review patch. If anyone has any objections, please let me know.
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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@perex.cz> Cc: Takashi Iwai <tiwai@suse.de> Cc: Eldad Zack <eldad@fogrefinery.com> Cc: Daniel Mack <zonque@gmail.com> Cc: Clemens Ladisch <clemens@ladisch.de> Signed-off-by: Tim Gardner <tim.gardner@canonical.com> Signed-off-by: Takashi Iwai <tiwai@suse.de> Signed-off-by: Jiri Slaby <jslaby@suse.cz> --- sound/usb/pcm.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/sound/usb/pcm.c b/sound/usb/pcm.c index b375d58871e7..d59e0c1a3e20 100644 --- a/sound/usb/pcm.c +++ b/sound/usb/pcm.c @@ -1491,7 +1491,8 @@ static void retire_playback_urb(struct snd_usb_substream *subs, * 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); -- 2.0.0
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