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regmap: Fix for v4.8

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A fix for an issue with double locking that was introduced earlier this
 release.  I'd missed in review that we were already in a locked region
 when trying to drop part of the cache.
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Merge tag 'regmap-fix-v4.8-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regmap

Pull regmap fix from Mark Brown:
 "A fix for an issue with double locking that was introduced earlier
  this release.  I'd missed in review that we were already in a locked
  region when trying to drop part of the cache"

* tag 'regmap-fix-v4.8-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regmap:
  regmap: fix deadlock on _regmap_raw_write() error path
This commit is contained in:
Linus Torvalds 2016-09-23 11:50:49 -07:00
commit 78bbf153fa
1 changed files with 5 additions and 1 deletions
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6
drivers/base/regmap/regmap.c
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@ -1475,7 +1475,11 @@ int _regmap_raw_write(struct regmap *map, unsigned int reg,
kfree(buf);
} else if (ret != 0 && !map->cache_bypass && map->format.parse_val) {
regcache_drop_region(map, reg, reg + 1);
/* regcache_drop_region() takes lock that we already have,
* thus call map->cache_ops->drop() directly
*/
if (map->cache_ops && map->cache_ops->drop)
map->cache_ops->drop(map, reg, reg + 1);
}
trace_regmap_hw_write_done(map, reg, val_len / map->format.val_bytes);