[PATCH] regulator: core: Avoid debugfs: Directory ... already present! error

From: Hans de Goede
Date: Fri Jan 22 2021 - 13:44:44 EST

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@xxxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx>
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 ca03d8e70bd1..75ec6f334506 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -1617,7 +1617,7 @@ 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];
@@ -1663,8 +1663,8 @@ 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 {