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| author | Fabio Estevam <festevam@denx.de> | 2022-01-07 17:33:07 +0100 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2022-01-07 18:14:29 +0100 |
| commit | 530792efa6cb86f5612ff093333fec735793b582 (patch) | |
| tree | 769f69431aef79355ebfb163aff7a226c5ee0549 /drivers/base/regmap/regmap.c | |
| parent | regmap: allow to define reg_update_bits for no bus configuration (diff) | |
| download | linux-530792efa6cb86f5612ff093333fec735793b582.tar.xz linux-530792efa6cb86f5612ff093333fec735793b582.zip | |
regmap: Call regmap_debugfs_exit() prior to _init()
Since commit cffa4b2122f5 ("regmap: debugfs: Fix a memory leak when
calling regmap_attach_dev"), the following debugfs error is seen
on i.MX boards:
debugfs: Directory 'dummy-iomuxc-gpr@20e0000' with parent 'regmap' already present!
In the attempt to fix the memory leak, the above commit added a NULL check
for map->debugfs_name. For the first debufs entry, map->debugfs_name is NULL
and then the new name is allocated via kasprintf().
For the second debugfs entry, map->debugfs_name() is no longer NULL, so
it will keep using the old entry name and the duplicate name error is seen.
Quoting Mark Brown:
"That means that if the device gets freed we'll end up with the old debugfs
file hanging around pointing at nothing.
...
To be more explicit this means we need a call to regmap_debugfs_exit()
which will clean up all the existing debugfs stuff before we loose
references to it."
Call regmap_debugfs_exit() prior to regmap_debugfs_init() to fix
the problem.
Tested on i.MX6Q and i.MX6SX boards.
Fixes: cffa4b2122f5 ("regmap: debugfs: Fix a memory leak when calling regmap_attach_dev")
Suggested-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Fabio Estevam <festevam@denx.de>
Link: https://lore.kernel.org/r/20220107163307.335404-1-festevam@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/base/regmap/regmap.c')
| -rw-r--r-- | drivers/base/regmap/regmap.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c index 2d74f9f82aa9..8f9fe5fd4707 100644 --- a/drivers/base/regmap/regmap.c +++ b/drivers/base/regmap/regmap.c @@ -647,6 +647,7 @@ int regmap_attach_dev(struct device *dev, struct regmap *map, if (ret) return ret; + regmap_debugfs_exit(map); regmap_debugfs_init(map); /* Add a devres resource for dev_get_regmap() */ |