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| author | Hans de Goede <hdegoede@redhat.com> | 2021-01-22 19:32:50 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-03-04 10:26:30 +0100 |
| commit | 8eaf7e3480ecd4d560e1b79d7f4ccc61ffb97198 (patch) | |
| tree | ae2ad91bbb99793a3c30ded873adc97dbbc21d2e /drivers/regulator | |
| parent | 486a018932fedbd389c350652f71761aec0bebc6 (diff) | |
| download | linux-8eaf7e3480ecd4d560e1b79d7f4ccc61ffb97198.tar.gz linux-8eaf7e3480ecd4d560e1b79d7f4ccc61ffb97198.tar.bz2 linux-8eaf7e3480ecd4d560e1b79d7f4ccc61ffb97198.zip | |
regulator: core: Avoid debugfs: Directory ... already present! error
[ Upstream commit dbe954d8f1635f949a1d9a5d6e6fb749ae022b47 ]
Sometimes regulator_get() gets called twice for the same supply on the
same device. This may happen e.g. when a framework / library is used
which uses the regulator; and the driver itself also needs to enable
the regulator in some cases where the framework will not enable it.
Commit ff268b56ce8c ("regulator: core: Don't spew backtraces on
duplicate sysfs") already takes care of the backtrace which would
trigger when creating a duplicate consumer symlink under
/sys/class/regulator/regulator.%d in this scenario.
Commit c33d442328f5 ("debugfs: make error message a bit more verbose")
causes a new error to get logged in this scenario:
[ 26.938425] debugfs: Directory 'wm5102-codec-MICVDD' with parent 'spi-WM510204:00-MICVDD' already present!
There is no _nowarn variant of debugfs_create_dir(), but we can detect
and avoid this problem by checking the return value of the earlier
sysfs_create_link_nowarn() call.
Add a check for the earlier sysfs_create_link_nowarn() failing with
-EEXIST and skip the debugfs_create_dir() call in that case, avoiding
this error getting logged.
Fixes: c33d442328f5 ("debugfs: make error message a bit more verbose")
Cc: Charles Keepax <ckeepax@opensource.cirrus.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Link: https://lore.kernel.org/r/20210122183250.370571-1-hdegoede@redhat.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers/regulator')
| -rw-r--r-- | drivers/regulator/core.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c index 5b9d570df85c..a31b6ae92a84 100644 --- a/drivers/regulator/core.c +++ b/drivers/regulator/core.c @@ -1576,7 +1576,7 @@ static struct regulator *create_regulator(struct regulator_dev *rdev, const char *supply_name) { struct regulator *regulator; - int err; + int err = 0; if (dev) { char buf[REG_STR_SIZE]; @@ -1622,8 +1622,8 @@ static struct regulator *create_regulator(struct regulator_dev *rdev, } } - regulator->debugfs = debugfs_create_dir(supply_name, - rdev->debugfs); + if (err != -EEXIST) + regulator->debugfs = debugfs_create_dir(supply_name, rdev->debugfs); if (!regulator->debugfs) { rdev_dbg(rdev, "Failed to create debugfs directory\n"); } else { |