From: Ben Whitten ben.whitten@gmail.com
commit 2e31aab08bad0d4ee3d3d890a7b74cb6293e0a41 upstream.
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 Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/base/regmap/regmap.c | 17 ++++++++++++----- 1 file changed, 12 insertions(+), 5 deletions(-)
--- a/drivers/base/regmap/regmap.c +++ b/drivers/base/regmap/regmap.c @@ -1488,11 +1488,18 @@ static int _regmap_raw_write_impl(struct
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;