From: Mark Brown <broonie@kernel.org>
Date: Mon, 1 Feb 2016 21:09:14 +0000 (+0000)
Subject: regmap: Return an error if a caller attempts to do an unsupported raw read
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=bb2bb45d1be28987e6cb50f50e4819795537ab83;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git

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>
---

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,