linux-kernel - Re: [PATCH 24/69] TTY: con3215, centralize allocation

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Date:	Tue, 3 Apr 2012 07:56:51 +0200
From:	Heiko Carstens <heiko.carstens@...ibm.com>
To:	Jiri Slaby <jslaby@...e.cz>
Cc:	gregkh@...uxfoundation.org, alan@...ux.intel.com,
	linux-kernel@...r.kernel.org, jirislaby@...il.com,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	linux390@...ibm.com, linux-s390@...r.kernel.org
Subject: Re: [PATCH 24/69] TTY: con3215, centralize allocation

On Mon, Apr 02, 2012 at 01:54:08PM +0200, Jiri Slaby wrote:
> There are two copies of allocations of device information. One of them
> is totally broken. See:
> raw->cdev = cdev;
> raw->inbuf = (char *) raw + sizeof(struct raw3215_info);
> memset(raw, 0, sizeof(struct raw3215_info));
> 
> It suggests that this path was never executed. The code uses both
> raw->cdev and raw->inbuf all over. And it is NULL due to the memset
> here, so it would panic immediately. I believe nobody used that driver
> without being a system console.
> 
> Either way, let us fix it by moving the allocations (and
> initializations) to a single place. This will save us some double
> initializations later too.
> 
> And while at it, initialize the timer properly -- once, at the
> allocation.
> 
> Signed-off-by: Jiri Slaby <jslaby@...e.cz>
> Cc: Martin Schwidefsky <schwidefsky@...ibm.com>
> Cc: Heiko Carstens <heiko.carstens@...ibm.com>
> Cc: linux390@...ibm.com
> Cc: linux-s390@...r.kernel.org
> ---
>  drivers/s390/char/con3215.c |   74 +++++++++++++++++++++++--------------------
>  1 file changed, 39 insertions(+), 35 deletions(-)

Nice!

Acked-by: Heiko Carstens <heiko.carstens@...ibm.com>

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