linux-kernel - Re: [PATCH 2/5 -tip] cifs: umount

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Date:	Thu, 23 Apr 2009 20:15:16 +0100
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Alessio Igor Bogani <abogani@...ware.it>
Cc:	Ingo Molnar <mingo@...e.hu>, Jonathan Corbet <corbet@....net>,
	Fr??d??ric Weisbecker <fweisbec@...il.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	LKML <linux-kernel@...r.kernel.org>,
	LFSDEV <linux-fsdevel@...r.kernel.org>
Subject: Re: [PATCH 2/5 -tip] cifs: umount_begin BKL pushdown

On Thu, Apr 23, 2009 at 09:12:02PM +0200, Alessio Igor Bogani wrote:
>  	struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
>  	struct cifsTconInfo *tcon;
>  
> -	if (cifs_sb == NULL)
> +	lock_kernel();
> +
> +	if (cifs_sb == NULL) {
> +		unlock_kernel();
>  		return;
> +	}

Huh?  Why would a bleeding *local* *variable* care about BKL at all?

>  	tcon = cifs_sb->tcon;
> -	if (tcon == NULL)
> +	if (tcon == NULL) {
> +		unlock_kernel();
>  		return;
> +	}
>  
>  	read_lock(&cifs_tcp_ses_lock);
>  	if (tcon->tc_count == 1)
>  		tcon->tidStatus = CifsExiting;
>  	read_unlock(&cifs_tcp_ses_lock);
>  
> +	unlock_kernel();
> +
>  	/* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
>  	/* cancel_notify_requests(tcon); */

... and why would the rest of it *not* care?

>  	if (tcon->ses && tcon->ses->server) {
> -- 
> 1.6.0.4
> 
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