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From: Arnd Bergmann <arnd@arndb.de>
To: Mark Brown <broonie@kernel.org>
Cc: Arnd Bergmann <arnd@arndb.de>,
	Liam Girdwood <lgirdwood@gmail.com>,
	Jaroslav Kysela <perex@perex.cz>, Takashi Iwai <tiwai@suse.com>,
	Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>,
	Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>,
	Ranjani Sridharan <ranjani.sridharan@linux.intel.com>,
	Shreyas NC <shreyas.nc@intel.com>,
	alsa-devel@alsa-project.org, linux-kernel@vger.kernel.org
Subject: [PATCH] ASoC: component: suppress uninitialized-variable warning
Date: Tue, 28 Apr 2020 23:47:31 +0200	[thread overview]
Message-ID: <20200428214754.3925368-1-arnd@arndb.de> (raw)

Old versions of gcc (tested on gcc-4.8) produce a warning for
correct code:

sound/soc/soc-compress.c: In function 'soc_compr_open':
sound/soc/soc-compress.c:75:28: error: 'component' is used uninitialized in this function [-Werror=uninitialized]
  struct snd_soc_component *component, *save = NULL;

Change the for_each_rtd_components() macro to ensure 'component'
gets initialized to a value the compiler does not complain about.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 include/sound/soc.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/sound/soc.h b/include/sound/soc.h
index 907afbc652f2..69a82487fa9b 100644
--- a/include/sound/soc.h
+++ b/include/sound/soc.h
@@ -1179,7 +1179,7 @@ struct snd_soc_pcm_runtime {
 #define asoc_rtd_to_codec(rtd, n) (rtd)->dais[n + (rtd)->num_cpus]
 
 #define for_each_rtd_components(rtd, i, component)			\
-	for ((i) = 0;							\
+	for ((i) = 0, component = NULL;					\
 	     ((i) < rtd->num_components) && ((component) = rtd->components[i]);\
 	     (i)++)
 #define for_each_rtd_cpu_dais(rtd, i, dai)				\
-- 
2.26.0


WARNING: multiple messages have this Message-ID (diff)
From: Arnd Bergmann <arnd@arndb.de>
To: Mark Brown <broonie@kernel.org>
Cc: alsa-devel@alsa-project.org, Arnd Bergmann <arnd@arndb.de>,
	Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>,
	Liam Girdwood <lgirdwood@gmail.com>,
	linux-kernel@vger.kernel.org,
	Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>,
	Takashi Iwai <tiwai@suse.com>,
	Ranjani Sridharan <ranjani.sridharan@linux.intel.com>,
	Shreyas NC <shreyas.nc@intel.com>
Subject: [PATCH] ASoC: component: suppress uninitialized-variable warning
Date: Tue, 28 Apr 2020 23:47:31 +0200	[thread overview]
Message-ID: <20200428214754.3925368-1-arnd@arndb.de> (raw)

Old versions of gcc (tested on gcc-4.8) produce a warning for
correct code:

sound/soc/soc-compress.c: In function 'soc_compr_open':
sound/soc/soc-compress.c:75:28: error: 'component' is used uninitialized in this function [-Werror=uninitialized]
  struct snd_soc_component *component, *save = NULL;

Change the for_each_rtd_components() macro to ensure 'component'
gets initialized to a value the compiler does not complain about.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 include/sound/soc.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/sound/soc.h b/include/sound/soc.h
index 907afbc652f2..69a82487fa9b 100644
--- a/include/sound/soc.h
+++ b/include/sound/soc.h
@@ -1179,7 +1179,7 @@ struct snd_soc_pcm_runtime {
 #define asoc_rtd_to_codec(rtd, n) (rtd)->dais[n + (rtd)->num_cpus]
 
 #define for_each_rtd_components(rtd, i, component)			\
-	for ((i) = 0;							\
+	for ((i) = 0, component = NULL;					\
 	     ((i) < rtd->num_components) && ((component) = rtd->components[i]);\
 	     (i)++)
 #define for_each_rtd_cpu_dais(rtd, i, dai)				\
-- 
2.26.0


             reply	other threads:[~2020-04-28 21:48 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-04-28 21:47 Arnd Bergmann [this message]
2020-04-28 21:47 ` [PATCH] ASoC: component: suppress uninitialized-variable warning Arnd Bergmann
2020-04-29 16:26 ` Mark Brown
2020-04-29 16:26   ` Mark Brown

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