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From: Mark Brown <broonie@kernel.org>
To: linux-kernel@vger.kernel.org
Cc: Mark Brown <broonie@kernel.org>
Subject: [PATCH] regmap: Return an error if a caller attempts to do an unsupported raw read
Date: Mon,  1 Feb 2016 21:11:07 +0000	[thread overview]
Message-ID: <1454361067-8943-1-git-send-email-broonie@kernel.org> (raw)

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,
-- 
2.7.0.rc3

             reply	other threads:[~2016-02-01 21:11 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-02-01 21:11 Mark Brown [this message]
2016-02-01 21:16 ` Applied "regmap: Return an error if a caller attempts to do an unsupported raw read" to the regmap tree Mark Brown

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