linux-kernel - Re: [PATCH 1/2] staging/comedi/drivers: release allocated I/O region if alloc

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Message-ID: <4FF15E92.3040503@mev.co.uk>
Date:	Mon, 2 Jul 2012 09:40:50 +0100
From:	Ian Abbott <abbotti@....co.uk>
To:	Devendra Naga <devendra.aaru@...il.com>
CC:	Ian Abbott <ian.abbott@....co.uk>,
	Mori Hess <fmhess@...rs.sourceforge.net>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	H Hartley Sweeten <hsweeten@...ionengravers.com>,
	"devel@...verdev.osuosl.org" <devel@...verdev.osuosl.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] staging/comedi/drivers: release allocated I/O region
 if alloc_private fails

On 2012-07-01 14:36, Devendra Naga wrote:
> if alloc_private fail, we wont' release the I/O region,
> which was request_region 'ed.
>
> release the allocated I/O region if alloc_private fails.
>
> Signed-off-by: Devendra Naga <devendra.aaru@...il.com>
> ---
>   drivers/staging/comedi/drivers/fl512.c |    4 +++-
>   1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/staging/comedi/drivers/fl512.c b/drivers/staging/comedi/drivers/fl512.c
> index d1da809..52e6d14 100644
> --- a/drivers/staging/comedi/drivers/fl512.c
> +++ b/drivers/staging/comedi/drivers/fl512.c
> @@ -125,8 +125,10 @@ static int fl512_attach(struct comedi_device *dev, struct comedi_devconfig *it)
>   	}
>   	dev->iobase = iobase;
>   	dev->board_name = "fl512";
> -	if (alloc_private(dev, sizeof(struct fl512_private)) < 0)
> +	if (alloc_private(dev, sizeof(struct fl512_private)) < 0) {
> +		release_region(iobase, FL512_SIZE);
>   		return -ENOMEM;
> +	}
>
>   #if DEBUG
>   	printk(KERN_DEBUG "malloc ok\n");

No.  The I/O region will be deallocated in fl512_detach() because 
dev->iobase has been set non-zero.  fl512_detach() will be called by the 
comedi core if fl512_attach() returns an error.  This is an unusual 
aspect of the comedi drivers.

-- 
-=( Ian Abbott @ MEV Ltd.    E-mail: <abbotti@....co.uk>        )=-
-=( Tel: +44 (0)161 477 1898   FAX: +44 (0)161 718 3587         )=-
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