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regmap: Return an error if a caller attempts to do an unsupported raw read 

regmaps without raw I/O access can't implement raw I/O operations,
return an error if someone tries to do that rather than crashing.

Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Mark Brown 2016-02-01 21:09:14 +00:00
parent 922a9f936e
commit bb2bb45d1b
1 changed files with 3 additions and 0 deletions
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3
drivers/base/regmap/regmap.c
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@ -2255,6 +2255,9 @@ static int _regmap_raw_read(struct regmap *map, unsigned int reg, void *val,
WARN_ON(!map->bus);
if (!map->bus || !map->bus->read)
return -EINVAL;
range = _regmap_range_lookup(map, reg);
if (range) {
ret = _regmap_select_page(map, &reg, range,