From a9eaa8130707d4013fb109b80323489c0d0111ac Mon Sep 17 00:00:00 2001
From: Guenter Roeck <linux@roeck-us.net>
Date: Fri, 17 Oct 2014 08:17:03 -0700
Subject: regulator: Ensure unique regulator debugfs directory names
If multiple regulator devices of the same type exist in a system,
the regulator driver assigns generic names for the regulators it
provides, and debugfs is enabled, the regulator subsystem attempts
to create multiple entries with the same name in the regulator debugfs
directory. This fails for all but the first regulator, resulting in
multiple "Failed to create debugfs directory" log entries.
To avoid the problem, prepend the debugfs directory name for a regulator
with its parent device name if available, but only if no explicit
regulator name was provided.
Cc: Alan Tull <atull@opensource.altera.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Mark Brown <broonie@kernel.org>
---
drivers/regulator/core.c | 13 ++++++++++++-
1 file changed, 12 insertions(+), 1 deletion(-)
(limited to 'drivers/regulator/core.c')
diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index b899947d839d..cc242aa368ef 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -3502,7 +3502,18 @@ static struct class regulator_class = {
static void rdev_init_debugfs(struct regulator_dev *rdev)
{
- rdev->debugfs = debugfs_create_dir(rdev_get_name(rdev), debugfs_root);
+ struct device *parent = rdev->dev.parent;
+ const char *rname = rdev_get_name(rdev);
+ char name[NAME_MAX];
+
+ /* Avoid duplicate debugfs directory names */
+ if (parent && rname == rdev->desc->name) {
+ snprintf(name, sizeof(name), "%s-%s", dev_name(parent),
+ rname);
+ rname = name;
+ }
+
+ rdev->debugfs = debugfs_create_dir(rname, debugfs_root);
if (!rdev->debugfs) {
rdev_warn(rdev, "Failed to create debugfs directory\n");
return;
--
cgit v1.2.2