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 6a19515f8a458b3719fce7325f265a60a4d147a4..b897c1a88b560a8881fd2a88608ba801b0e45988 100644 (file)
--- 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