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| author |   Ben Whitten <ben.whitten@gmail.com> | 2020-01-18 20:56:24 +0000 |
|---|---|---|
| committer |   Mark Brown <broonie@kernel.org> | 2020-01-21 17:16:26 +0000 |
| commit | 2e31aab08bad0d4ee3d3d890a7b74cb6293e0a41 (patch) | |
| tree | 7e5a4e5c28ccfd1d7ea76d873984059fd6b0a93f /drivers/base/regmap/regmap.c | |
| parent | regmap: add iopoll-like atomic polling macro (diff) | |
| download | linux-dev-2e31aab08bad0d4ee3d3d890a7b74cb6293e0a41.tar.xz linux-dev-2e31aab08bad0d4ee3d3d890a7b74cb6293e0a41.zip | |
regmap: fix writes to non incrementing registers
When checking if a register block is writable we must ensure that the
block does not start with or contain a non incrementing register.
Fixes: 8b9f9d4dc511 ("regmap: verify if register is writeable before writing operations")
Signed-off-by: Ben Whitten <ben.whitten@gmail.com>
Link: https://lore.kernel.org/r/20200118205625.14532-1-ben.whitten@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to '')
| -rw-r--r-- | drivers/base/regmap/regmap.c | 17 |
1 files changed, 12 insertions, 5 deletions
diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c index 19f57ccfbe1d..59f911e57719 100644 --- a/drivers/base/regmap/regmap.c +++ b/drivers/base/regmap/regmap.c @@ -1488,11 +1488,18 @@ static int _regmap_raw_write_impl(struct regmap *map, unsigned int reg, WARN_ON(!map->bus); - /* Check for unwritable registers before we start */ - for (i = 0; i < val_len / map->format.val_bytes; i++) - if (!regmap_writeable(map, - reg + regmap_get_offset(map, i))) - return -EINVAL; + /* Check for unwritable or noinc registers in range + * before we start + */ + if (!regmap_writeable_noinc(map, reg)) { + for (i = 0; i < val_len / map->format.val_bytes; i++) { + unsigned int element = + reg + regmap_get_offset(map, i); + if (!regmap_writeable(map, element) || + regmap_writeable_noinc(map, element)) + return -EINVAL; + } + } if (!map->cache_bypass && map->format.parse_val) { unsigned int ival; |