[PATCH 5.4 80/84] regulator: core: fix debugfs creation regression

[Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>]

5.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Johan Hovold <johan+linaro@xxxxxxxxxx>

commit 2a4b49bb58123bad6ec0e07b02845f74c23d5e04 upstream.

regulator_get() may sometimes be called more than once for the same
consumer device, something which before commit dbe954d8f163 ("regulator:
core: Avoid debugfs: Directory ...  already present! error") resulted in
errors being logged.

A couple of recent commits broke the handling of such cases so that
attributes are now erroneously created in the debugfs root directory the
second time a regulator is requested and the log is filled with errors
like:

	debugfs: File 'uA_load' in directory '/' already present!
	debugfs: File 'min_uV' in directory '/' already present!
	debugfs: File 'max_uV' in directory '/' already present!
	debugfs: File 'constraint_flags' in directory '/' already present!

on any further calls.

Fixes: 2715bb11cfff ("regulator: core: Fix more error checking for debugfs_create_dir()")
Fixes: 08880713ceec ("regulator: core: Streamline debugfs operations")
Cc: stable@xxxxxxxxxxxxxxx
Cc: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>
Signed-off-by: Johan Hovold <johan+linaro@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20240509133304.8883-1-johan+linaro@xxxxxxxxxx
Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/regulator/core.c |   27 ++++++++++++++++-----------
 1 file changed, 16 insertions(+), 11 deletions(-)

--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -1708,19 +1708,24 @@ static struct regulator *create_regulato
 		}
 	}
 
-	if (err != -EEXIST)
+	if (err != -EEXIST) {
 		regulator->debugfs = debugfs_create_dir(supply_name, rdev->debugfs);
-	if (IS_ERR(regulator->debugfs))
-		rdev_dbg(rdev, "Failed to create debugfs directory\n");
+		if (IS_ERR(regulator->debugfs)) {
+			rdev_dbg(rdev, "Failed to create debugfs directory\n");
+			regulator->debugfs = NULL;
+		}
+	}
 
-	debugfs_create_u32("uA_load", 0444, regulator->debugfs,
-			   &regulator->uA_load);
-	debugfs_create_u32("min_uV", 0444, regulator->debugfs,
-			   &regulator->voltage[PM_SUSPEND_ON].min_uV);
-	debugfs_create_u32("max_uV", 0444, regulator->debugfs,
-			   &regulator->voltage[PM_SUSPEND_ON].max_uV);
-	debugfs_create_file("constraint_flags", 0444, regulator->debugfs,
-			    regulator, &constraint_flags_fops);
+	if (regulator->debugfs) {
+		debugfs_create_u32("uA_load", 0444, regulator->debugfs,
+				   &regulator->uA_load);
+		debugfs_create_u32("min_uV", 0444, regulator->debugfs,
+				   &regulator->voltage[PM_SUSPEND_ON].min_uV);
+		debugfs_create_u32("max_uV", 0444, regulator->debugfs,
+				   &regulator->voltage[PM_SUSPEND_ON].max_uV);
+		debugfs_create_file("constraint_flags", 0444, regulator->debugfs,
+				    regulator, &constraint_flags_fops);
+	}
 
 	/*
 	 * Check now if the regulator is an always on regulator - if