linux-kernel - Re: [PATCH] Fix for bad lock balance in Containers

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Date:	Wed, 27 Jun 2007 13:04:55 +0530
From:	Dhaval Giani <dhaval@...ux.vnet.ibm.com>
To:	menage@...gle.com
Cc:	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>,
	Balbir Singh <balbir@...ibm.com>, svaidy@...ux.vnet.ibm.com,
	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	bharata@...ux.vnet.ibm.com
Subject: Re: [PATCH] Fix for bad lock balance in Containers

On Tue, Jun 26, 2007 at 10:30:11AM +0530, Dhaval Giani wrote:
Hi,

There was a mistake in the patch. Thanks to Andrew Morton for pointing it out.
Sending out a fresh patch. Sorry for the mistake!
 
>  		BUG_ON(ret);
>  	} else {
>  		/* Reuse the existing superblock */
> +		down_write(&(root->sb->umount));

Should be down_write(&(root->sb->s_umount));

>  		ret = simple_set_mnt(mnt, root->sb);
>  		if (!ret)
>  			atomic_inc(&root->sb->s_active);

Signed-off-by: Dhaval Giani <dhaval@...ux.vnet.ibm.com>


--- linux-2.6.22-rc4/kernel/container.c	2007-06-13 15:38:32.000000000 +0530
+++ old/kernel/container.c	2007-06-25 00:55:03.000000000 +0530
@@ -995,6 +995,7 @@ static int container_get_sb(struct file_
 		BUG_ON(ret);
 	} else {
 		/* Reuse the existing superblock */
+		down_write(&(root->sb->s_umount));
 		ret = simple_set_mnt(mnt, root->sb);
 		if (!ret)
 			atomic_inc(&root->sb->s_active);
-
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