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authorHan Nandor <nandor.han@vaisala.com>2019-04-02 08:01:22 +0000
committerMark Brown <broonie@kernel.org>2019-04-03 11:08:11 +0700
commit8b9f9d4dc511309918c4f6793bae7387c0c638af (patch)
tree9f7462507251668ce2e5dabcc65d45dbcb3f7277 /drivers/base/regmap
parentcc6a8d69ba624f0ad7a09ed095b7bd4b86476489 (diff)
downloadlinux-8b9f9d4dc511309918c4f6793bae7387c0c638af.tar.bz2
regmap: verify if register is writeable before writing operations
regmap provides a couple of ways to validate the register range used. a) maxim allowed register, b) writable/readable register tables, c) callback function that can be provided by the driver to validate a register. regmap framework should verify if registers are writeable before every write operation. However this doesn't seems to happen in every situation. The method `_regmap_raw_write_impl` is only using the `writeable_reg` callback to verify if register is writeable, ignoring the other two. This can lead to undefined behaviour since this allows to write to registers that could be declared un-writeable by using any other option. Change `_regmap_raw_write_impl` to use the `regmap_writeable` method to verify if registers are writable before the write operation. Signed-off-by: Nandor Han <nandor.han@vaisala.com> Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/base/regmap')
-rw-r--r--drivers/base/regmap/regmap.c9
1 files changed, 4 insertions, 5 deletions
diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c
index 4f822e087def..42d8404bc8cc 100644
--- a/drivers/base/regmap/regmap.c
+++ b/drivers/base/regmap/regmap.c
@@ -1493,11 +1493,10 @@ static int _regmap_raw_write_impl(struct regmap *map, unsigned int reg,
WARN_ON(!map->bus);
/* Check for unwritable registers before we start */
- if (map->writeable_reg)
- for (i = 0; i < val_len / map->format.val_bytes; i++)
- if (!map->writeable_reg(map->dev,
- reg + regmap_get_offset(map, i)))
- return -EINVAL;
+ for (i = 0; i < val_len / map->format.val_bytes; i++)
+ if (!regmap_writeable(map,
+ reg + regmap_get_offset(map, i)))
+ return -EINVAL;
if (!map->cache_bypass && map->format.parse_val) {
unsigned int ival;