From: Cai Zhiyong <caizhiyong@huawei.com>
Date: Mon, 18 Nov 2013 12:21:49 +0000 (+0800)
Subject: regmap: Fix 'ret' would return an uninitialized value
X-Git-Tag: upstream/snapshot3+hdmi~3571^2~1^2~4
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=bd60e381fab88979c3312265d18bb635c314d242;p=platform%2Fadaptation%2Frenesas_rcar%2Frenesas_kernel.git

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@huawei.com>
Reviewed-by: Geyslan G. Bem <geyslan@gmail.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
---

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;