commit 60ed286a61b43e3fedf18e63f2d71b758f3505aa
author Daniel Mack <zonque@gmail.com> Wed May 18 11:28:39 2011 +0200
committer Takashi Iwai <tiwai@suse.de> Wed May 18 11:44:35 2011 +0200
tree 2ed34a95001e561a3dbb4b331edee677273cb355
parent 23dc05a33fd45c1f53b51e6ad9a209bf021a16c8

ALSA: usb-audio: make hwc_debug a noop in case HW_CONST_DEBUG is not set

Just defining it to nothing is dangerous as it can alter the code
execution flow, for example when used in as only function in a
conditional code block.

Signed-off-by: Daniel Mack <zonque@gmail.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/usb/debug.h

diff --git a/sound/usb/debug.h b/sound/usb/debug.h
index 343ec2d..5803017 100644
--- a/sound/usb/debug.h
+++ b/sound/usb/debug.h
@@ -8,7 +8,7 @@
 #ifdef HW_CONST_DEBUG
 #define hwc_debug(fmt, args...) printk(KERN_DEBUG fmt, ##args)
 #else
-#define hwc_debug(fmt, args...) /**/
+#define hwc_debug(fmt, args...) do { } while(0)
 #endif
 
 #endif /* __USBAUDIO_DEBUG_H */