linux-kernel - [PATCH v2] counter: Set counter device name

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Message-Id: <20220204084551.16397-1-vilhelm.gray@gmail.com>
Date:   Fri,  4 Feb 2022 17:45:51 +0900
From:   William Breathitt Gray <vilhelm.gray@...il.com>
To:     jic23@...nel.org
Cc:     u.kleine-koenig@...gutronix.de, linux-iio@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        William Breathitt Gray <vilhelm.gray@...il.com>
Subject: [PATCH v2] counter: Set counter device name

Naming the counter device provides a convenient way to identify it in
devres_log events and similar situations. This patch names the counter
device by combining the prefix "counter" with the counter device's
unique ID.

Cc: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
Signed-off-by: William Breathitt Gray <vilhelm.gray@...il.com>
---
Changes in v2:
 - Move dev_set_name() after device_initialize() so that device core
   takes care of cleanup on error

 drivers/counter/counter-core.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/drivers/counter/counter-core.c b/drivers/counter/counter-core.c
index 7e0957eea094..6219d62bf223 100644
--- a/drivers/counter/counter-core.c
+++ b/drivers/counter/counter-core.c
@@ -22,6 +22,8 @@
 #include "counter-chrdev.h"
 #include "counter-sysfs.h"
 
+#define COUNTER_NAME	"counter"
+
 /* Provides a unique ID for each counter device */
 static DEFINE_IDA(counter_ida);
 
@@ -115,8 +117,15 @@ struct counter_device *counter_alloc(size_t sizeof_priv)
 
 	device_initialize(dev);
 
+	err = dev_set_name(dev, COUNTER_NAME "%d", dev->id);
+	if (err)
+		goto err_dev_set_name;
+
 	return counter;
 
+err_dev_set_name:
+
+	counter_chrdev_remove(counter);
 err_chrdev_add:
 
 	ida_free(&counter_ida, dev->id);
@@ -250,7 +259,8 @@ static int __init counter_init(void)
 	if (err < 0)
 		return err;
 
-	err = alloc_chrdev_region(&counter_devt, 0, COUNTER_DEV_MAX, "counter");
+	err = alloc_chrdev_region(&counter_devt, 0, COUNTER_DEV_MAX,
+				  COUNTER_NAME);
 	if (err < 0)
 		goto err_unregister_bus;
 

base-commit: 7b9c8e1a0ca18a62565ee0e28b23baf7b176e96f
-- 
2.35.1