linux-kernel - Re: [PATCH 1/3] Char: mxser

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Message-ID: <20070420162931.44f426e9@the-village.bc.nu>
Date:	Fri, 20 Apr 2007 16:29:31 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Jan Yenya Kasprzak <kas@...muni.cz>
Cc:	Jiri Slaby <jirislaby@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] Char: mxser_new, fix recursive locking

> Signed-off-by: Jan "Yenya" Kasprzak <kas@...muni.cz>
> Cc: Jiri Slaby <jirislaby@...il.com>
> Cc: Alan Cox <alan@...rguk.ukuu.org.uk>

Acked-by: Alan Cox <alan@...hat.com>
> 
> --- linux-2.6.21-rc2/drivers/char/mxser_new.c.orig	2007-04-20 15:41:46.000000000 +0200
> +++ linux-2.6.21-rc2/drivers/char/mxser_new.c	2007-04-20 15:46:46.000000000 +0200
> @@ -2230,7 +2230,14 @@
>  	port->mon_data.rxcnt += cnt;
>  	port->mon_data.up_rxcnt += cnt;
>  
> +	/*
> +	 * We are called from an interrupt context with &port->slock
> +	 * being held. Drop it temporarily in order to prevent
> +	 * recursive locking.
> +	 */
> +	spin_unlock(&port->slock);
>  	tty_flip_buffer_push(tty);
> +	spin_lock(&port->slock);
>  }
>  
-
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