linux-kernel - Re: [PATCH] staging: comedi: adl_pci9118: Delete an unnecessary check before the function call "pci_dev

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Message-ID: <559115F7.4050100@mev.co.uk>
Date:	Mon, 29 Jun 2015 10:55:03 +0100
From:	Ian Abbott <abbotti@....co.uk>
To:	SF Markus Elfring <elfring@...rs.sourceforge.net>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	H Hartley Sweeten <hsweeten@...ionengravers.com>,
	devel@...verdev.osuosl.org
CC:	LKML <linux-kernel@...r.kernel.org>,
	kernel-janitors@...r.kernel.org,
	Julia Lawall <julia.lawall@...6.fr>
Subject: Re: [PATCH] staging: comedi: adl_pci9118: Delete an unnecessary check
 before the function call "pci_dev_put"

On 27/06/15 13:10, SF Markus Elfring wrote:
> From: Markus Elfring <elfring@...rs.sourceforge.net>
> Date: Sat, 27 Jun 2015 13:50:43 +0200
>
> The pci_dev_put() function tests whether its argument is NULL and then
> returns immediately. Thus the test around the call is not needed.
>
> This issue was detected by using the Coccinelle software.
>
> Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
> ---
>   drivers/staging/comedi/drivers/adl_pci9118.c | 3 +--
>   1 file changed, 1 insertion(+), 2 deletions(-)
>
> diff --git a/drivers/staging/comedi/drivers/adl_pci9118.c b/drivers/staging/comedi/drivers/adl_pci9118.c
> index fb3043d..19b5806 100644
> --- a/drivers/staging/comedi/drivers/adl_pci9118.c
> +++ b/drivers/staging/comedi/drivers/adl_pci9118.c
> @@ -1717,8 +1717,7 @@ static void pci9118_detach(struct comedi_device *dev)
>   		pci9118_reset(dev);
>   	comedi_pci_detach(dev);
>   	pci9118_free_dma(dev);
> -	if (pcidev)
> -		pci_dev_put(pcidev);
> +	pci_dev_put(pcidev);
>   }
>
>   static struct comedi_driver adl_pci9118_driver = {
>

The same patch was posted independently (and earlier) by Maninder Singh, 
but I think we concluded that the code was more understandable without 
this change, as the test within pci_dev_put() is more of a safety net.

-- 
-=( Ian Abbott @ MEV Ltd.    E-mail: <abbotti@....co.uk> )=-
-=(                          Web: http://www.mev.co.uk/  )=-
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