linux-kernel - Re: [PATCH] parport_pc: release IO region properly if unsupported ITE887x card is found

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Date:	Thu, 06 Oct 2011 17:48:56 +0100
From:	Niels de Vos <ndevos@...hat.com>
To:	Jiri Kosina <jkosina@...e.cz>
CC:	Bjorn Helgaas <bjorn.helgaas@...com>,
	Alan Cox <alan@...ux.intel.com>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Joe Krahn <krahn@...hs.nih.gov>,
	Andrew Morton <akpm@...gle.com>, Rich.Liu@....com.tw,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] parport_pc: release IO region properly if unsupported
 ITE887x card is found

On 10/06/2011 04:38 PM, Jiri Kosina wrote:
> sio_ite_8872_probe() bails out if it detects no-parallel (1S, 2S) or unknown
> card.
> 
> It doesn't call release_region() on the previously allocated resource though.
> This causes
> 
>   (a) leak of the resource
>   (b) kernel oops when parport module is removed and /proc/ioports is read. This
>       is because the string that has been associated to the IO port region
>       is a static char array inside the already removed module.
> 
> Let's call release_region() properly before baling out.
> 
> Signed-off-by: Jiri Kosina <jkosina@...e.cz>
> ---
>  drivers/parport/parport_pc.c |    3 +++
>  1 files changed, 3 insertions(+), 0 deletions(-)
> 
> diff --git a/drivers/parport/parport_pc.c b/drivers/parport/parport_pc.c
> index d1cdb94..d0b597b 100644
> --- a/drivers/parport/parport_pc.c
> +++ b/drivers/parport/parport_pc.c
> @@ -2595,14 +2595,17 @@ static int __devinit sio_ite_8872_probe(struct pci_dev *pdev, int autoirq,
>  		break;
>  	case 0x6:
>  		printk(KERN_INFO "parport_pc: ITE8873 found (1S)\n");
> +		release_region(inta_addr[i], 32);
>  		return 0;
>  	case 0x8:
>  		printk(KERN_INFO "parport_pc: ITE8874 found (2S)\n");
> +		release_region(inta_addr[i], 32);
>  		return 0;
>  	default:
>  		printk(KERN_INFO "parport_pc: unknown ITE887x\n");
>  		printk(KERN_INFO "parport_pc: please mail 'lspci -nvv' "
>  			"output to Rich.Liu@....com.tw\n");
> +		release_region(inta_addr[i], 32);
>  		return 0;
>  	}
>  

Looks good to me, now release_region() is now consistent through the
whole of sio_ite_8872_probe().

Also verified that this is not an issue in drivers/tty/serial/8250_pci.c
where a similar logic for the same chip is used.

Acked-by: Niels de Vos <ndevos@...hat.com>
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