From: Arnd Bergmann <arnd@arndb.de>
Date: Thu, 18 May 2017 13:35:54 +0000 (+0200)
Subject: ALSA: pcm: use "do {} while (0)" for empty macro
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=9aee03f39c13fc674f5973baa69d13e32b45b535;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git

ALSA: pcm: use "do {} while (0)" for empty macro

Recent compilers produce a harmless warning for the new pcm_call_notify()
macro when CONFIG_SND_PCM_OSS is disabled:

sound/core/pcm.c: In function 'snd_pcm_free':
sound/core/pcm.c:905:37: error: suggest braces around empty body in an 'if' statement [-Werror=empty-body]

This turns the empty macro into a 'do {} while (0)' statement to avoid
the warning.

Fixes: 58f30d650c7f ("ALSA: pcm: Build pcm notifier code conditionally")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
---

diff --git a/sound/core/pcm.c b/sound/core/pcm.c
index 24acbfb5c531..d30dba0ee688 100644
--- a/sound/core/pcm.c
+++ b/sound/core/pcm.c
@@ -894,7 +894,7 @@ static void snd_pcm_free_stream(struct snd_pcm_str * pstr)
 			_notify->call(pcm);				\
 	} while (0)
 #else
-#define pcm_call_notify(pcm, call) /* NOP */
+#define pcm_call_notify(pcm, call) do {} while (0)
 #endif
 
 static int snd_pcm_free(struct snd_pcm *pcm)