From: Cosmin Tanislav demonsingur@gmail.com

commit 3061e170381af96d1e66799d34264e6414d428a7 upstream.

This is a reland commit: - 48dc44f3c1afa29390cb2fbc8badad1b1111cea4 backported it incorrectly. - 276185236bd8281dca88863b751b481e027cada7 reverted the wrong commit. - This re-backports it.

At the end of __regmap_init(), if dev is not NULL, regmap_attach_dev() is called, which adds a devres reference to the regmap, to be able to retrieve a dev's regmap by name using dev_get_regmap().

When calling regmap_exit, the opposite does not happen, and the reference is kept until the dev is detached.

Add a regmap_detach_dev() function and call it in regmap_exit() to make sure that the devres reference is not kept.

Cc: stable@vger.kernel.org Fixes: 72b39f6f2b5a ("regmap: Implement dev_get_regmap()") Signed-off-by: Cosmin Tanislav demonsingur@gmail.com Rule: add Link: https://lore.kernel.org/stable/20241128130554.362486-1-demonsingur%40gmail.c... Link: https://patch.msgid.link/20241128131625.363835-1-demonsingur@gmail.com Signed-off-by: Mark Brown broonie@kernel.org Link: https://lore.kernel.org/r/20250115033244.2540522-1-tzungbi@kernel.org Signed-off-by: Tzung-Bi Shih tzungbi@kernel.org --- drivers/base/regmap/regmap.c | 12 ++++++++++++ 1 file changed, 12 insertions(+)

diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c index 15b37a4163d3..f0e314abcafc 100644 --- a/drivers/base/regmap/regmap.c +++ b/drivers/base/regmap/regmap.c @@ -652,6 +652,17 @@ int regmap_attach_dev(struct device *dev, struct regmap *map, } EXPORT_SYMBOL_GPL(regmap_attach_dev);

+static int dev_get_regmap_match(struct device *dev, void *res, void *data); + +static int regmap_detach_dev(struct device *dev, struct regmap *map) +{ + if (!dev) + return 0; + + return devres_release(dev, dev_get_regmap_release, + dev_get_regmap_match, (void *)map->name); +} + static enum regmap_endian regmap_get_reg_endian(const struct regmap_bus *bus, const struct regmap_config *config) { @@ -1536,6 +1547,7 @@ void regmap_exit(struct regmap *map) { struct regmap_async *async;

+ regmap_detach_dev(map->dev, map); regcache_exit(map); regmap_debugfs_exit(map); regmap_range_exit(map);