[PATCH] drivers: vmw_balloon: remove dentry pointer for debugfs

[PATCH] drivers: vmw_balloon: remove dentry pointer for debugfs

[Greg Kroah-Hartman]

There is no need to keep the dentry pointer around for the created
debugfs file, as it is only needed when removing it from the system.
When it is to be removed, ask debugfs itself for the pointer, to save on
storage and make things a bit simpler.

Cc: Nadav Amit <namit@vmware.com>
Cc: "VMware, Inc." <pv-drivers@vmware.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/misc/vmw_balloon.c | 11 +++--------
 1 file changed, 3 insertions(+), 8 deletions(-)

diff --git a/drivers/misc/vmw_balloon.c b/drivers/misc/vmw_balloon.c
index b837e7eba5f7..f1d8ba6d4857 100644
--- a/drivers/misc/vmw_balloon.c
+++ b/drivers/misc/vmw_balloon.c
@@ -346,11 +346,6 @@ struct vmballoon {
 	/* statistics */
 	struct vmballoon_stats *stats;
 
-#ifdef CONFIG_DEBUG_FS
-	/* debugfs file exporting statistics */
-	struct dentry *dbg_entry;
-#endif
-
 	/**
 	 * @b_dev_info: balloon device information descriptor.
 	 */
@@ -1709,14 +1704,14 @@ DEFINE_SHOW_ATTRIBUTE(vmballoon_debug);
 
 static void __init vmballoon_debugfs_init(struct vmballoon *b)
 {
-	b->dbg_entry = debugfs_create_file("vmmemctl", S_IRUGO, NULL, b,
-					   &vmballoon_debug_fops);
+	debugfs_create_file("vmmemctl", S_IRUGO, NULL, b,
+			    &vmballoon_debug_fops);
 }
 
 static void __exit vmballoon_debugfs_exit(struct vmballoon *b)
 {
 	static_key_disable(&balloon_stat_enabled.key);
-	debugfs_remove(b->dbg_entry);
+	debugfs_remove(debugfs_lookup("vmmemctl", NULL));
 	kfree(b->stats);
 	b->stats = NULL;
 }
-- 
2.30.1

Re: [PATCH] drivers: vmw_balloon: remove dentry pointer for debugfs

[Nadav Amit]

> On Feb 16, 2021, at 7:12 AM, Greg Kroah-Hartman <gregkh@linuxfoundation.org> wrote:
> 
> There is no need to keep the dentry pointer around for the created
> debugfs file, as it is only needed when removing it from the system.
> When it is to be removed, ask debugfs itself for the pointer, to save on
> storage and make things a bit simpler.
> 
> Cc: Nadav Amit <namit@vmware.com>
> Cc: "VMware, Inc." <pv-drivers@vmware.com>
> Cc: Arnd Bergmann <arnd@arndb.de>
> Cc: linux-kernel@vger.kernel.org
> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> ---

Thanks for the cleanup.

Acked-by: Nadav Amit <namit@vmware.com>