[PATCH 1/2] regmap: Return an error if a caller attempts to do an unsupported raw read

From: Mark Brown
Date: Mon Feb 01 2016 - 16:38:30 EST


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@xxxxxxxxxx>
---
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,
--
2.7.0.rc3