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regmap: Add raw_write/read checks for max_raw_write/read sizes 

Check in regmap_raw_read() and regmap_raw_write() for correct maximum
sizes of the operations. Return -E2BIG if this size is not supported
because it is too big.

Also this patch causes an uninitialized variable warning so it
initializes ret (although not necessary).

Signed-off-by: Markus Pargmann <mpa@pengutronix.de>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Markus Pargmann 2015-08-30 09:33:55 +02:00 committed by Mark Brown
parent f50c9eb4e9
commit c335931ed9
1 changed files with 6 additions and 0 deletions
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6
drivers/base/regmap/regmap.c
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@ -1584,6 +1584,8 @@ int regmap_raw_write(struct regmap *map, unsigned int reg,
return -EINVAL;
if (val_len % map->format.val_bytes)
return -EINVAL;
if (map->max_raw_write && map->max_raw_write > val_len)
return -E2BIG;
map->lock(map->lock_arg);
@ -2256,6 +2258,10 @@ int regmap_raw_read(struct regmap *map, unsigned int reg, void *val,
ret = -ENOTSUPP;
goto out;
}
if (map->max_raw_read && map->max_raw_read < val_len) {
ret = -E2BIG;
goto out;
}
/* Physical block read if there's no cache involved */
ret = _regmap_raw_read(map, reg, val, val_len);