linux-kernel - [PATCH] Revert "debugfs: annotate debugfs handlers vs. removal with lockdep"

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Message-ID: <20231202114936.fd55431ab160.I911aa53abeeca138126f690d383a89b13eb05667@changeid>
Date:   Sat,  2 Dec 2023 11:49:37 +0100
From:   Johannes Berg <johannes@...solutions.net>
To:     linux-kernel@...r.kernel.org
Cc:     linux-wireless@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Sergey Senozhatsky <senozhatsky@...omium.org>,
        Johannes Berg <johannes.berg@...el.com>
Subject: [PATCH] Revert "debugfs: annotate debugfs handlers vs. removal with lockdep"

From: Johannes Berg <johannes.berg@...el.com>

This reverts commit f4acfcd4deb1 ("debugfs: annotate debugfs handlers
vs. removal with lockdep"), it appears to have false positives and
really shouldn't have been in the -rc series with the fixes anyway.

Signed-off-by: Johannes Berg <johannes.berg@...el.com>
---
 fs/debugfs/file.c     | 10 ----------
 fs/debugfs/inode.c    |  7 -------
 fs/debugfs/internal.h |  6 ------
 3 files changed, 23 deletions(-)

diff --git a/fs/debugfs/file.c b/fs/debugfs/file.c
index a5ade8c16375..5063434be0fc 100644
--- a/fs/debugfs/file.c
+++ b/fs/debugfs/file.c
@@ -108,12 +108,6 @@ int debugfs_file_get(struct dentry *dentry)
 			kfree(fsd);
 			fsd = READ_ONCE(dentry->d_fsdata);
 		}
-#ifdef CONFIG_LOCKDEP
-		fsd->lock_name = kasprintf(GFP_KERNEL, "debugfs:%pd", dentry);
-		lockdep_register_key(&fsd->key);
-		lockdep_init_map(&fsd->lockdep_map, fsd->lock_name ?: "debugfs",
-				 &fsd->key, 0);
-#endif
 		INIT_LIST_HEAD(&fsd->cancellations);
 		mutex_init(&fsd->cancellations_mtx);
 	}
@@ -132,8 +126,6 @@ int debugfs_file_get(struct dentry *dentry)
 	if (!refcount_inc_not_zero(&fsd->active_users))
 		return -EIO;
 
-	lock_map_acquire_read(&fsd->lockdep_map);
-
 	return 0;
 }
 EXPORT_SYMBOL_GPL(debugfs_file_get);
@@ -151,8 +143,6 @@ void debugfs_file_put(struct dentry *dentry)
 {
 	struct debugfs_fsdata *fsd = READ_ONCE(dentry->d_fsdata);
 
-	lock_map_release(&fsd->lockdep_map);
-
 	if (refcount_dec_and_test(&fsd->active_users))
 		complete(&fsd->active_users_drained);
 }
diff --git a/fs/debugfs/inode.c b/fs/debugfs/inode.c
index e4e7fe1bd9fb..034a617cb1a5 100644
--- a/fs/debugfs/inode.c
+++ b/fs/debugfs/inode.c
@@ -243,10 +243,6 @@ static void debugfs_release_dentry(struct dentry *dentry)
 
 	/* check it wasn't a dir (no fsdata) or automount (no real_fops) */
 	if (fsd && fsd->real_fops) {
-#ifdef CONFIG_LOCKDEP
-		lockdep_unregister_key(&fsd->key);
-		kfree(fsd->lock_name);
-#endif
 		WARN_ON(!list_empty(&fsd->cancellations));
 		mutex_destroy(&fsd->cancellations_mtx);
 	}
@@ -755,9 +751,6 @@ static void __debugfs_file_removed(struct dentry *dentry)
 	if ((unsigned long)fsd & DEBUGFS_FSDATA_IS_REAL_FOPS_BIT)
 		return;
 
-	lock_map_acquire(&fsd->lockdep_map);
-	lock_map_release(&fsd->lockdep_map);
-
 	/* if we hit zero, just wait for all to finish */
 	if (!refcount_dec_and_test(&fsd->active_users)) {
 		wait_for_completion(&fsd->active_users_drained);
diff --git a/fs/debugfs/internal.h b/fs/debugfs/internal.h
index 0c4c68cf161f..dae80c2a469e 100644
--- a/fs/debugfs/internal.h
+++ b/fs/debugfs/internal.h
@@ -7,7 +7,6 @@
 
 #ifndef _DEBUGFS_INTERNAL_H_
 #define _DEBUGFS_INTERNAL_H_
-#include <linux/lockdep.h>
 #include <linux/list.h>
 
 struct file_operations;
@@ -25,11 +24,6 @@ struct debugfs_fsdata {
 		struct {
 			refcount_t active_users;
 			struct completion active_users_drained;
-#ifdef CONFIG_LOCKDEP
-			struct lockdep_map lockdep_map;
-			struct lock_class_key key;
-			char *lock_name;
-#endif
 
 			/* protect cancellations */
 			struct mutex cancellations_mtx;
-- 
2.43.0