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regmap: regmap_raw_read return error on !bus->read

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Return -ENOTSUPP if map->bus->read is not implemented and we do not use
the cache. This code path would directly use bus->read would run into an
NULL pointer for the read function.

Signed-off-by: Markus Pargmann <mpa@pengutronix.de>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Markus Pargmann 2015-08-20 11:12:35 +02:00 committed by Mark Brown
parent bc0195aad0
commit 9a16ea900f
1 changed files with 5 additions and 0 deletions
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5
drivers/base/regmap/regmap.c
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@ -2184,6 +2184,11 @@ int regmap_raw_read(struct regmap *map, unsigned int reg, void *val,
if (regmap_volatile_range(map, reg, val_count) || map->cache_bypass ||
map->cache_type == REGCACHE_NONE) {
if (!map->bus->read) {
ret = -ENOTSUPP;
goto out;
}
/* Physical block read if there's no cache involved */
ret = _regmap_raw_read(map, reg, val, val_len);