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Subject[PATCH 1/4] regmap: Lock the sync path, ensure we use the lockless _regmap_write()
Date
Signed-off-by: Dimitris Papastamos <dp@opensource.wolfsonmicro.com>
---
drivers/base/regmap/regcache-indexed.c | 4 ++--
drivers/base/regmap/regcache-lzo.c | 2 +-
drivers/base/regmap/regcache-rbtree.c | 2 +-
drivers/base/regmap/regcache.c | 4 +++-
4 files changed, 7 insertions(+), 5 deletions(-)

diff --git a/drivers/base/regmap/regcache-indexed.c b/drivers/base/regmap/regcache-indexed.c
index 268497a..2e10bb1 100644
--- a/drivers/base/regmap/regcache-indexed.c
+++ b/drivers/base/regmap/regcache-indexed.c
@@ -45,8 +45,8 @@ static int regcache_indexed_sync(struct regmap *map)
int ret;

for (i = 0; i < map->num_reg_defaults; i++) {
- ret = regmap_write(map, map->reg_defaults[i].reg,
- map->reg_defaults[i].def);
+ ret = _regmap_write(map, map->reg_defaults[i].reg,
+ map->reg_defaults[i].def);
if (ret < 0)
return ret;
dev_dbg(map->dev, "Synced register %#x, value %#x\n",
diff --git a/drivers/base/regmap/regcache-lzo.c b/drivers/base/regmap/regcache-lzo.c
index 9079cb5..ad6af92 100644
--- a/drivers/base/regmap/regcache-lzo.c
+++ b/drivers/base/regmap/regcache-lzo.c
@@ -339,7 +339,7 @@ static int regcache_lzo_sync(struct regmap *map)
if (ret)
return ret;
map->cache_bypass = 1;
- ret = regmap_write(map, i, val);
+ ret = _regmap_write(map, i, val);
map->cache_bypass = 0;
if (ret)
return ret;
diff --git a/drivers/base/regmap/regcache-rbtree.c b/drivers/base/regmap/regcache-rbtree.c
index de32ced..40f23dd 100644
--- a/drivers/base/regmap/regcache-rbtree.c
+++ b/drivers/base/regmap/regcache-rbtree.c
@@ -327,7 +327,7 @@ static int regcache_rbtree_sync(struct regmap *map)
if (val == def)
continue;
map->cache_bypass = 1;
- ret = regmap_write(map, regtmp, val);
+ ret = _regmap_write(map, regtmp, val);
map->cache_bypass = 0;
if (ret)
return ret;
diff --git a/drivers/base/regmap/regcache.c b/drivers/base/regmap/regcache.c
index 4dfab41..8393c47 100644
--- a/drivers/base/regmap/regcache.c
+++ b/drivers/base/regmap/regcache.c
@@ -230,6 +230,7 @@ int regcache_sync(struct regmap *map)

BUG_ON(!map->cache_ops);

+ mutex_lock(&map->lock);
dev_dbg(map->dev, "Syncing %s cache\n",
map->cache_ops->name);
name = map->cache_ops->name;
@@ -242,7 +243,7 @@ int regcache_sync(struct regmap *map)
if (ret < 0)
goto out;
map->cache_bypass = 1;
- ret = regmap_write(map, i, val);
+ ret = _regmap_write(map, i, val);
map->cache_bypass = 0;
if (ret < 0)
goto out;
@@ -254,6 +255,7 @@ int regcache_sync(struct regmap *map)
}
out:
trace_regcache_sync(map->dev, name, "stop");
+ mutex_unlock(&map->lock);

return ret;
}
--
1.7.6.4


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