linux-kernel - [PATCH v2] hid-wiimote-debug.c: Drop error checking for debugfs_create

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Date:   Tue, 30 May 2023 20:42:52 +0500
From:   Osama Muhammad <osmtendev@...il.com>
To:     david.rheinsberg@...il.com, jikos@...nel.org,
        benjamin.tissoires@...hat.com
Cc:     linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
        Osama Muhammad <osmtendev@...il.com>
Subject: [PATCH v2] hid-wiimote-debug.c: Drop error checking for debugfs_create_file

This patch removes the error checking for debugfs_create_file
in hid-wiimote-debug.c.c. This is because the debugfs_create_file()
does not return NULL but an ERR_PTR after an error.
The DebugFS kernel API is developed in a way that the
caller can safely ignore the errors that occur during
the creation of DebugFS nodes.The debugfs Api handles
it gracefully. The check is unnecessary.

Link to the comment above debugfs_create_file:
https://elixir.bootlin.com/linux/latest/source/fs/debugfs/inode.c#L451

Signed-off-by: Osama Muhammad <osmtendev@...il.com>

---
changes since v1
	-In v1 the IS_ERR was used for error checking which is dropped now.
---
 drivers/hid/hid-wiimote-debug.c | 10 ----------
 1 file changed, 10 deletions(-)

diff --git a/drivers/hid/hid-wiimote-debug.c b/drivers/hid/hid-wiimote-debug.c
index a99dcca2e099..00f9be55f148 100644
--- a/drivers/hid/hid-wiimote-debug.c
+++ b/drivers/hid/hid-wiimote-debug.c
@@ -173,7 +173,6 @@ int wiidebug_init(struct wiimote_data *wdata)
 {
 	struct wiimote_debug *dbg;
 	unsigned long flags;
-	int ret = -ENOMEM;
 
 	dbg = kzalloc(sizeof(*dbg), GFP_KERNEL);
 	if (!dbg)
@@ -183,13 +182,9 @@ int wiidebug_init(struct wiimote_data *wdata)
 
 	dbg->eeprom = debugfs_create_file("eeprom", S_IRUSR,
 		dbg->wdata->hdev->debug_dir, dbg, &wiidebug_eeprom_fops);
-	if (!dbg->eeprom)
-		goto err;
 
 	dbg->drm = debugfs_create_file("drm", S_IRUSR,
 			dbg->wdata->hdev->debug_dir, dbg, &wiidebug_drm_fops);
-	if (!dbg->drm)
-		goto err_drm;
 
 	spin_lock_irqsave(&wdata->state.lock, flags);
 	wdata->debug = dbg;
@@ -197,11 +192,6 @@ int wiidebug_init(struct wiimote_data *wdata)
 
 	return 0;
 
-err_drm:
-	debugfs_remove(dbg->eeprom);
-err:
-	kfree(dbg);
-	return ret;
 }
 
 void wiidebug_deinit(struct wiimote_data *wdata)
-- 
2.34.1