Patch "regmap: Hold the regmap lock when allocating and freeing the cache" has been added to the 4.19-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    regmap: Hold the regmap lock when allocating and freeing the cache

to the 4.19-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     regmap-hold-the-regmap-lock-when-allocating-and-free.patch
and it can be found in the queue-4.19 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit f4f0ff0ff39cd475cc0a40b0f9f1347ff0688925
Author: Mark Brown <broonie@xxxxxxxxxx>
Date:   Thu Aug 22 20:13:36 2024 +0100

    regmap: Hold the regmap lock when allocating and freeing the cache
    
    [ Upstream commit fd4ebc07b4dff7e1abedf1b7fd477bc04b69ae55 ]
    
    For the benefit of the maple tree's lockdep checking hold the lock while
    creating and exiting the cache.
    
    Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
    Link: https://patch.msgid.link/20240822-b4-regmap-maple-nolock-v1-2-d5e6dbae3396@xxxxxxxxxx
    Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/base/regmap/regcache.c b/drivers/base/regmap/regcache.c
index b78e4b6e2c9da..b86fefa4b089e 100644
--- a/drivers/base/regmap/regcache.c
+++ b/drivers/base/regmap/regcache.c
@@ -193,7 +193,9 @@ int regcache_init(struct regmap *map, const struct regmap_config *config)
 	if (map->cache_ops->init) {
 		dev_dbg(map->dev, "Initializing %s cache\n",
 			map->cache_ops->name);
+		map->lock(map->lock_arg);
 		ret = map->cache_ops->init(map);
+		map->unlock(map->lock_arg);
 		if (ret)
 			goto err_free;
 	}
@@ -221,7 +223,9 @@ void regcache_exit(struct regmap *map)
 	if (map->cache_ops->exit) {
 		dev_dbg(map->dev, "Destroying %s cache\n",
 			map->cache_ops->name);
+		map->lock(map->lock_arg);
 		map->cache_ops->exit(map);
+		map->unlock(map->lock_arg);
 	}
 }
 
diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c
index 5e03735374ae2..75b793af4781a 100644
--- a/drivers/base/regmap/regmap.c
+++ b/drivers/base/regmap/regmap.c
@@ -1312,6 +1312,7 @@ void regmap_exit(struct regmap *map)
 	struct regmap_async *async;
 
 	regcache_exit(map);
+
 	regmap_debugfs_exit(map);
 	regmap_range_exit(map);
 	if (map->bus && map->bus->free_context)