From: Daniel Mack <zonque@gmail.com>
Date: Wed, 18 May 2011 09:28:39 +0000 (+0200)
Subject: ALSA: usb-audio: make hwc_debug a noop in case HW_CONST_DEBUG is not set
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=60ed286a61b43e3fedf18e63f2d71b758f3505aa;p=GitHub%2Fexynos8895%2Fandroid_kernel_samsung_universal8895.git

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>
---

diff --git a/sound/usb/debug.h b/sound/usb/debug.h
index 343ec2d9ee66..58030176f008 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 */