diff options
| author | Mark Brown <broonie@kernel.org> | 2016-02-01 21:09:14 +0000 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2016-02-01 21:11:38 +0000 |
| commit | bb2bb45d1be28987e6cb50f50e4819795537ab83 (patch) | |
| tree | fe74c7504043119b2f4f1ba67adf8d8ef224f220 /drivers/base/regmap | |
| parent | 922a9f936e40001f9b921379aab90047d5990923 (diff) | |
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>
Diffstat (limited to 'drivers/base/regmap')
| -rw-r--r-- | drivers/base/regmap/regmap.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c index 343263449aff..e2f68807d970 100644 --- a/drivers/base/regmap/regmap.c +++ b/drivers/base/regmap/regmap.c @@ -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, ®, range, |