[alsa-devel] [PATCH 1/2] 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 --- drivers/base/regmap/regmap.c | 3 +++ 1 file changed, 3 insertions(+)

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, &reg, range,