From 4174a7a4f763ed51809a4dbca06de054d31c1d38 Mon Sep 17 00:00:00 2001 From: Anthony Olech Date: Wed, 9 Oct 2013 17:44:38 +0100 Subject: [PATCH] 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 Signed-off-by: Mark Brown --- drivers/base/regmap/regmap.c | 9 +++++---- 1 file 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; }