linux-kernel - Re: [PATCH] fs/autofs: Fix sparse warning: context imbalance in 'autofs4_d_automount'

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Date:	Fri, 04 Jan 2013 07:54:01 +0800
From:	Ian Kent <raven@...maw.net>
To:	Peter Huewe <peterhuewe@....de>
Cc:	autofs@...r.kernel.org, linux-kernel@...r.kernel.org,
	Fengguang Wu <fengguang.wu@...el.com>
Subject: Re: [PATCH] fs/autofs: Fix sparse warning: context imbalance in
 'autofs4_d_automount' - different lock contexts for basic block

On Thu, 2013-01-03 at 15:52 +0100, Peter Huewe wrote:
> Sparse complains:
> + fs/autofs4/root.c:409:9: sparse: context imbalance in
> 'autofs4_d_automount' - different lock contexts for basic block
> 
> This was introduced by commit
> f55fb0c243 autofs4 - dont clear DCACHE_NEED_AUTOMOUNT on rootless mount
> 
> The function autofs4_d_automount can be left with the (&sbi->fs_lock)
> held if sbi->version <= 4 and simple_empty(dentry) == false so the warning seems valid.
> 
> --> Add an spin_unlock in this case before we jump to done
> 
> Unfortunately compile tested only.
> 
> Reported-by: Fengguang Wu <fengguang.wu@...el.com>
> Signed-off-by: Peter Huewe <peterhuewe@....de>

Yes, good catch, it looks right to me.
Acked-by: Ian Kent <raven@...maw.net>

> ---
>  fs/autofs4/root.c |    4 +++-
>  1 files changed, 3 insertions(+), 1 deletions(-)
> 
> diff --git a/fs/autofs4/root.c b/fs/autofs4/root.c
> index c934476..74a299f 100644
> --- a/fs/autofs4/root.c
> +++ b/fs/autofs4/root.c
> @@ -383,8 +383,10 @@ static struct vfsmount *autofs4_d_automount(struct path *path)
>  				goto done;
>  			}
>  		} else {
> -			if (!simple_empty(dentry))
> +			if (!simple_empty(dentry)) {
> +				spin_unlock(&sbi->fs_lock);
>  				goto done;
> +			}
>  		}
>  		ino->flags |= AUTOFS_INF_PENDING;
>  		spin_unlock(&sbi->fs_lock);


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