[PATCH 3/3] hwmon: (tps23861) create unique debugfs directory per device

From: Alexandru Gagniuc <mr.nuke.me@gmail.com>
To: linux@roeck-us.net, linux-hwmon@vger.kernel.org
Cc: robert.marko@sartura.hr, luka.perkov@sartura.hr,
	jdelvare@suse.com, dev@aboehler.at, linux-kernel@vger.kernel.org,
	Alexandru Gagniuc <mr.nuke.me@gmail.com>
Subject: [PATCH 3/3] hwmon: (tps23861) create unique debugfs directory per device
Date: Mon,  5 Sep 2022 09:28:06 -0500	[thread overview]
Message-ID: <20220905142806.110598-3-mr.nuke.me@gmail.com> (raw)
In-Reply-To: <20220905142806.110598-1-mr.nuke.me@gmail.com>

On systems with more than one tps23861, creating the debugfs directory
for additional devices fails with

    debugfs: Directory 'tps23861' with parent '/' already present!

To resolve this, include the hwmon device name in the directory name.
Since the name is unique, this guarantees that the debugfs directory
is unique.

Signed-off-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
---
 drivers/hwmon/tps23861.c | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/drivers/hwmon/tps23861.c b/drivers/hwmon/tps23861.c
index 0dbd12060b50..3e9df72702c0 100644
--- a/drivers/hwmon/tps23861.c
+++ b/drivers/hwmon/tps23861.c
@@ -503,9 +503,17 @@ static int tps23861_port_status_show(struct seq_file *s, void *data)
 
 DEFINE_SHOW_ATTRIBUTE(tps23861_port_status);
 
-static void tps23861_init_debugfs(struct tps23861_data *data)
+static void tps23861_init_debugfs(struct tps23861_data *data,
+				  struct device *hwmon_dev)
 {
-	data->debugfs_dir = debugfs_create_dir(data->client->name, NULL);
+	const char *debugfs_name;
+
+	debugfs_name = devm_kasprintf(&data->client->dev, GFP_KERNEL, "%s-%s",
+				      data->client->name, dev_name(hwmon_dev));
+	if (!debugfs_name)
+		return;
+
+	data->debugfs_dir = debugfs_create_dir(debugfs_name, NULL);
 
 	debugfs_create_file("port_status",
 			    0400,
@@ -554,7 +562,7 @@ static int tps23861_probe(struct i2c_client *client)
 	if (IS_ERR(hwmon_dev))
 		return PTR_ERR(hwmon_dev);
 
-	tps23861_init_debugfs(data);
+	tps23861_init_debugfs(data, hwmon_dev);
 
 	return 0;
 }
-- 
2.34.3

