[PATCH] regmap: Silence warning on invalid zero length read

[Mark Brown]

Zero length reads make no sense in a regmap context and are likely to
trigger bugs further down the stack so insert an error check, also
silencing compiler warnings about use of ret in cases where we iterate
per register.

Reported-by: Russell King <linux@xxxxxxxxxxxxxxxx>
Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
---

Not even compile tested yet.

 drivers/base/regmap/regmap.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c
index 7111d04f2621..db1102e9c34d 100644
--- a/drivers/base/regmap/regmap.c
+++ b/drivers/base/regmap/regmap.c
@@ -2179,6 +2179,8 @@ int regmap_raw_read(struct regmap *map, unsigned int reg, void *val,
 		return -EINVAL;
 	if (reg % map->reg_stride)
 		return -EINVAL;
+	if (val_count == 0)
+		return -EINVAL;
 
 	map->lock(map->lock_arg);
 
-- 
2.1.4

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