Patch "mm: __set_page_dirty uses spin_lock_irqsave instead of spin_lock_irq" has been added to the 3.4-stable tree

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This is a note to let you know that I've just added the patch titled

    mm: __set_page_dirty uses spin_lock_irqsave instead of spin_lock_irq

to the 3.4-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     mm-__set_page_dirty-uses-spin_lock_irqsave-instead-of-spin_lock_irq.patch
and it can be found in the queue-3.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.


>From 227d53b397a32a7614667b3ecaf1d89902fb6c12 Mon Sep 17 00:00:00 2001
From: KOSAKI Motohiro <kosaki.motohiro@xxxxxxxxxxxxxx>
Date: Thu, 6 Feb 2014 12:04:28 -0800
Subject: mm: __set_page_dirty uses spin_lock_irqsave instead of spin_lock_irq

From: KOSAKI Motohiro <kosaki.motohiro@xxxxxxxxxxxxxx>

commit 227d53b397a32a7614667b3ecaf1d89902fb6c12 upstream.

To use spin_{un}lock_irq is dangerous if caller disabled interrupt.
During aio buffer migration, we have a possibility to see the following
call stack.

aio_migratepage  [disable interrupt]
  migrate_page_copy
    clear_page_dirty_for_io
      set_page_dirty
        __set_page_dirty_buffers
          __set_page_dirty
            spin_lock_irq

This mean, current aio migration is a deadlockable.  spin_lock_irqsave
is a safer alternative and we should use it.

Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@xxxxxxxxxxxxxx>
Reported-by: David Rientjes rientjes@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 fs/buffer.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -613,14 +613,16 @@ EXPORT_SYMBOL(mark_buffer_dirty_inode);
 static void __set_page_dirty(struct page *page,
 		struct address_space *mapping, int warn)
 {
-	spin_lock_irq(&mapping->tree_lock);
+	unsigned long flags;
+
+	spin_lock_irqsave(&mapping->tree_lock, flags);
 	if (page->mapping) {	/* Race with truncate? */
 		WARN_ON_ONCE(warn && !PageUptodate(page));
 		account_page_dirtied(page, mapping);
 		radix_tree_tag_set(&mapping->page_tree,
 				page_index(page), PAGECACHE_TAG_DIRTY);
 	}
-	spin_unlock_irq(&mapping->tree_lock);
+	spin_unlock_irqrestore(&mapping->tree_lock, flags);
 	__mark_inode_dirty(mapping->host, I_DIRTY_PAGES);
 }
 


Patches currently in stable-queue which might be from kosaki.motohiro@xxxxxxxxxxxxxx are

queue-3.4/mm-__set_page_dirty-uses-spin_lock_irqsave-instead-of-spin_lock_irq.patch
queue-3.4/mm-__set_page_dirty_nobuffers-uses-spin_lock_irqsave-instead-of-spin_lock_irq.patch
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