linux-kernel - Re: dvb shared datastructure bug?

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Message-ID: <20070213113552.GL22959@devserv.devel.redhat.com>
Date:	Tue, 13 Feb 2007 06:35:52 -0500
From:	Jakub Jelinek <jakub@...hat.com>
To:	Manu Abraham <abraham.manu@...il.com>
Cc:	Marcel Siegert <mws@...uxtv.org>,
	Arjan van de Ven <arjan@...radead.org>,
	mchehab@...radead.org, v4l-dvb-maintainer@...uxtv.org,
	linux-kernel@...r.kernel.org
Subject: Re: dvb shared datastructure bug?

On Tue, Feb 13, 2007 at 03:14:23PM +0400, Manu Abraham wrote:
> >thanks for pointing out this issue.
> >
> >attached find a patch that fixes the problem.
> >
> >@mauro - please pull changeset a7ac92d208fe
> >   dvbdev: fix illegal re-usage of fileoperations struct
> >
> >from  http://www.linuxtv.org/hg/~mws/v4l-dvb-fixtree
> >
> 
> Ack'd-by: Manu Abraham <manu@...uxtv.org>

Wouldn't it be better to kmalloc both struct dvb_device and
struct file_operations together instead of doing 2 separate allocations?
struct dvd_device_plus_fops
{
  struct dvb_device dev;
  struct file_operations fops;
} *dev_fops = kmalloc (sizeof (struct dvd_device_plus_fops), GFP_KERNEL);
*pdvbdev = dvbdev = (struct dvb_device *)dev_fops;
if (dev_fops == NULL)
  error handling;
memset (&dev_fops->fops, 0, sizeof (dev_fops->fops));
...
dvbdev->fops = &dev_fops->fops;

	Jakub
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