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| author | Han Nandor <nandor.han@vaisala.com> | 2019-04-02 11:01:22 +0300 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2019-04-03 07:08:11 +0300 |
| commit | 8b9f9d4dc511309918c4f6793bae7387c0c638af (patch) | |
| tree | 9f7462507251668ce2e5dabcc65d45dbcb3f7277 /drivers/base/regmap | |
| parent | cc6a8d69ba624f0ad7a09ed095b7bd4b86476489 (diff) | |
| download | linux-8b9f9d4dc511309918c4f6793bae7387c0c638af.tar.xz | |
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.c | 9 |
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; |