[PATCH Trusty SRU] UBUNTU: SAUCE: (no-up) ALSA: usb-audio: Suppress repetitive debug messages from retire_playback_urb()

[Tim Gardner]

(upstreaming alternate patch)

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() &&

Signed-off-by: Tim Gardner <tim.gardner at canonical.com>
---
 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 ca3256d..7bfa7a1 100644
--- a/sound/usb/pcm.c
+++ b/sound/usb/pcm.c
@@ -1487,7 +1487,8 @@ 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);
 
-- 
1.7.9.5