linux-kernel - Re: Attribute removal patch causes lockdep warning

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Date:	Tue, 16 Jan 2007 13:20:07 -0800
From:	Greg KH <greg@...ah.com>
To:	Oliver Neukum <oneukum@...e.de>
Cc:	Alan Stern <stern@...land.harvard.edu>,
	Kernel development list <linux-kernel@...r.kernel.org>
Subject: Re: Attribute removal patch causes lockdep warning

On Tue, Jan 16, 2007 at 10:15:57PM +0100, Oliver Neukum wrote:
> Am Dienstag, 16. Januar 2007 21:33 schrieb Alan Stern:
> > Are you aware that your patch for safe attribute file removal provokes a 
> > lockdep warning at bootup?
> 
> Yes, I am aware of that. However, the top down lock order is always
> followed. A patch to make the lock checker realize that has been posted
> and included upstream.


Alan, here's the patch:


Signed-off-by: Frederik Deweerdt <frederik.deweerdt@...il.com>

diff --git a/fs/sysfs/inode.c b/fs/sysfs/inode.c
index 8c533cb..3b5574b 100644
--- a/fs/sysfs/inode.c
+++ b/fs/sysfs/inode.c
@@ -214,7 +214,7 @@ static inline void orphan_all_buffers(st
 	struct sysfs_buffer_collection *set = node->i_private;
 	struct sysfs_buffer *buf;
 
-	mutex_lock(&node->i_mutex);
+	mutex_lock_nested(&node->i_mutex, I_MUTEX_CHILD);
 	if (node->i_private) {
 		list_for_each_entry(buf, &set->associates, associates) {
 			down(&buf->sem);
@@ -271,7 +271,7 @@ int sysfs_hash_and_remove(struct dentry
 		return -ENOENT;
 
 	parent_sd = dir->d_fsdata;
-	mutex_lock(&dir->d_inode->i_mutex);
+	mutex_lock_nested(&dir->d_inode->i_mutex, I_MUTEX_PARENT);
 	list_for_each_entry(sd, &parent_sd->s_children, s_sibling) {
 		if (!sd->s_element)
 			continue;
 
-
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