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

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Date:	Tue,  2 Feb 2016 10:16:50 -0200
From:	Fabio Estevam <festevam@...il.com>
To:	broonie@...nel.org
Cc:	mail@...iej.szmigiero.name, linux-kernel@...r.kernel.org,
	Fabio Estevam <fabio.estevam@....com>
Subject: [PATCH 1/2] regmap: Return an error if a caller attempts to do an unsupported raw read

From: Mark Brown <broonie@...nel.org>

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@...nel.org>
Signed-off-by: Fabio Estevam <fabio.estevam@....com>
---
 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 3432634..e2f6880 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,
-- 
1.9.1