From: Hans de Goede hdegoede@redhat.com
[ 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 --- drivers/regulator/core.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c index 5b9d570df85cc..a31b6ae92a84e 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 {