linux-kernel - [PATCH 11/19] regmap: avoid undefined return from regmap_read

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Message-Id: <1359153858-31992-12-git-send-email-arnd@arndb.de>
Date:	Fri, 25 Jan 2013 22:44:10 +0000
From:	Arnd Bergmann <arnd@...db.de>
To:	linux-arm-kernel@...ts.infradead.org
Cc:	linux-kernel@...r.kernel.org, Arnd Bergmann <arnd@...db.de>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: [PATCH 11/19] regmap: avoid undefined return from regmap_read_debugfs

Gcc warns about the case where regmap_read_debugfs tries
to walk an empty map->debugfs_off_cache list, which results
in uninitialized variable getting returned.

Setting this variable to 0 first avoids the warning and
the potentially undefined value.

Without this patch, building mxs_defconfig results in:

drivers/base/regmap/regmap-debugfs.c: In function 'regmap_read_debugfs':
drivers/base/regmap/regmap-debugfs.c:147:9: : warning: 'ret' may be used uninitialized in this function [-Wmaybe-uninitialized]

Signed-off-by: Arnd Bergmann <arnd@...db.de>
Cc: Mark Brown <broonie@...nsource.wolfsonmicro.com>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/base/regmap/regmap-debugfs.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/base/regmap/regmap-debugfs.c b/drivers/base/regmap/regmap-debugfs.c
index 46a213a..31cc656 100644
--- a/drivers/base/regmap/regmap-debugfs.c
+++ b/drivers/base/regmap/regmap-debugfs.c
@@ -80,7 +80,7 @@ static unsigned int regmap_debugfs_get_dump_start(struct regmap *map,
 {
 	struct regmap_debugfs_off_cache *c = NULL;
 	loff_t p = 0;
-	unsigned int i, ret;
+	unsigned int i, ret = 0;
 
 	/*
 	 * If we don't have a cache build one so we don't have to do a
-- 
1.8.0

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