Messages in this thread Patch in this message | | | From | Sander Eikelenboom <> | Subject | [PATCH] Sound USB: Prevent printk ratelimiting from spamming kernel log while DEBUG not defined | Date | Fri, 2 May 2014 15:09:27 +0200 |
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This (widely used) construction:
if(printk_ratelimit()) dev_dbg()
Causes the ratelimiting to spam the kernel log with the "callbacks suppressed" message below, even while the dev_dbg it is supposed to rate limit wouldn't print anything because DEBUG is not defined for this device.
[ 533.803964] retire_playback_urb: 852 callbacks suppressed [ 538.807930] retire_playback_urb: 852 callbacks suppressed [ 543.811897] retire_playback_urb: 852 callbacks suppressed [ 548.815745] retire_playback_urb: 852 callbacks suppressed [ 553.819826] retire_playback_urb: 852 callbacks suppressed
So use dev_dbg_ratelimited() instead of this construction.
Signed-off-by: Sander Eikelenboom <linux@eikelenboom.it> --- sound/usb/pcm.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-)
diff --git a/sound/usb/pcm.c b/sound/usb/pcm.c index 131336d..c62a165 100644 --- a/sound/usb/pcm.c +++ b/sound/usb/pcm.c @@ -1501,9 +1501,8 @@ 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 (printk_ratelimit() && - abs(est_delay - subs->last_delay) * 1000 > runtime->rate * 2) - dev_dbg(&subs->dev->dev, + if (abs(est_delay - subs->last_delay) * 1000 > runtime->rate * 2) + dev_dbg_ratelimited(&subs->dev->dev, "delay: estimated %d, actual %d\n", est_delay, subs->last_delay); -- 1.7.10.4
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