diff options
| author | Anthony Olech <anthony.olech.opensource@diasemi.com> | 2013-10-09 18:44:38 +0200 |
|---|---|---|
| committer | Mark Brown <broonie@linaro.org> | 2013-10-09 19:47:27 +0200 |
| commit | 4174a7a4f763ed51809a4dbca06de054d31c1d38 (patch) | |
| tree | 4a9c3bf3ff7390545e13851bcece13b1f2ea7429 /drivers/base | |
| parent | Linux 3.12-rc4 (diff) | |
| download | linux-4174a7a4f763ed51809a4dbca06de054d31c1d38.tar.xz linux-4174a7a4f763ed51809a4dbca06de054d31c1d38.zip | |
regmap: Fix regmap_bulk_write single-rw mutex deadlock
When regmap_bulk_write() is called with the map->use_single_rw flag set
an immediate mutex deadlock happens because regmap_raw_write() is called
after obtaining the mutex and regmap_raw_write() itself then tries to
obtain the mutex as well.
It is obvious that no one other than myself tried it with a real device.
I did, but only for the purposes of an experiment and demonstration.
But even if this situation will never ever happen with a real device, it
is a bug and therefore should be fixed.
Signed-off-by: Anthony Olech <anthony.olech.opensource@diasemi.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
Diffstat (limited to 'drivers/base')
| -rw-r--r-- | drivers/base/regmap/regmap.c | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c index 7d689a15c500..c1245cae0f43 100644 --- a/drivers/base/regmap/regmap.c +++ b/drivers/base/regmap/regmap.c @@ -1418,10 +1418,11 @@ int regmap_bulk_write(struct regmap *map, unsigned int reg, const void *val, */ if (map->use_single_rw) { for (i = 0; i < val_count; i++) { - ret = regmap_raw_write(map, - reg + (i * map->reg_stride), - val + (i * val_bytes), - val_bytes); + ret = _regmap_raw_write(map, + reg + (i * map->reg_stride), + val + (i * val_bytes), + val_bytes, + false); if (ret != 0) return ret; } |