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 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;