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regmap: Silence warning on invalid zero length read

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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 <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Mark Brown 2015-07-01 23:51:43 +01:00
parent 04dc91ce2c
commit fa3eec7791
1 changed files with 2 additions and 0 deletions
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2
drivers/base/regmap/regmap.c
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@ -2180,6 +2180,8 @@ 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);