From: Michal Simek <michal.simek@xilinx.com>
Date: Mon, 10 Feb 2014 11:59:46 +0000 (+0100)
Subject: regmap: Check readable regs in _regmap_read
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=d4807ad2c4c0e17b6f00e3be9492c81de0804f40;p=linux-beck.git

regmap: Check readable regs in _regmap_read

Check if regs are readable.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
---

diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c
index 6a19515f8a45..b897c1a88b56 100644
--- a/drivers/base/regmap/regmap.c
+++ b/drivers/base/regmap/regmap.c
@@ -1736,6 +1736,9 @@ static int _regmap_read(struct regmap *map, unsigned int reg,
 	if (map->cache_only)
 		return -EBUSY;
 
+	if (!regmap_readable(map, reg))
+		return -EIO;
+
 	ret = map->reg_read(context, reg, val);
 	if (ret == 0) {
 #ifdef LOG_DEVICE