diff mbox

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

Message ID 1454361067-8943-1-git-send-email-broonie@kernel.org
State Accepted
Commit bb2bb45d1be28987e6cb50f50e4819795537ab83
Headers show

Commit Message

Mark Brown Feb. 1, 2016, 9:11 p.m. UTC 
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(+)

-- 
2.7.0.rc3
diff mbox

Patch

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,