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time/debug: Remove dentry pointer for debugfs 

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.

Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20210216155020.1012407-1-gregkh@linuxfoundation.org
This commit is contained in:
Greg Kroah-Hartman 2021-02-16 16:50:20 +01:00 committed by Thomas Gleixner
parent 1e28eed176
commit 44511ab344
1 changed files with 3 additions and 4 deletions
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7
kernel/time/test_udelay.c
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@ -21,7 +21,6 @@
#define DEBUGFS_FILENAME "udelay_test"
static DEFINE_MUTEX(udelay_test_lock);
static struct dentry *udelay_test_debugfs_file;
static int udelay_test_usecs;
static int udelay_test_iterations = DEFAULT_ITERATIONS;
@ -138,8 +137,8 @@ static const struct file_operations udelay_test_debugfs_ops = {
static int __init udelay_test_init(void)
{
mutex_lock(&udelay_test_lock);
udelay_test_debugfs_file = debugfs_create_file(DEBUGFS_FILENAME,
S_IRUSR, NULL, NULL, &udelay_test_debugfs_ops);
debugfs_create_file(DEBUGFS_FILENAME, S_IRUSR, NULL, NULL,
&udelay_test_debugfs_ops);
mutex_unlock(&udelay_test_lock);
return 0;
@ -150,7 +149,7 @@ module_init(udelay_test_init);
static void __exit udelay_test_exit(void)
{
mutex_lock(&udelay_test_lock);
debugfs_remove(udelay_test_debugfs_file);
debugfs_remove(debugfs_lookup(DEBUGFS_FILENAME, NULL));
mutex_unlock(&udelay_test_lock);
}