[PATCH] regmap: Fix 'ret' would return an uninitialized value

[Caizhiyong]

From: Cai Zhiyong <caizhiyong@xxxxxxxxxx>
Date: Mon, 18 Nov 2013 20:21:49 +0800
Subject: [PATCH] regmap: Fix 'ret' would return an uninitialized value

This patch give a warning when calling regmap_register_patch with
parameter num_regs <= 0.

When the num_regs parameter is zero and krealloc doesn't fail,
then the code would return an uninitialized value. However,
calling this function with num_regs == 0, would be a waste as it
essentially does nothing.

Signed-off-by: Cai Zhiyong <caizhiyong@xxxxxxxxxx>
---
 drivers/base/regmap/regmap.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c
index 9c021d9..9a36ac1 100644
--- a/drivers/base/regmap/regmap.c
+++ b/drivers/base/regmap/regmap.c
@@ -2173,6 +2173,10 @@ int regmap_register_patch(struct regmap *map, const struct reg_default *regs,
 	int i, ret;
 	bool bypass;
 
+	if (WARN_ONCE(num_regs <= 0, "invalid registers number (%d)\n",
+	    num_regs))
+		return 0;
+
 	map->lock(map->lock_arg);
 
 	bypass = map->cache_bypass;
-- 
1.8.1.5

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/