linux-kernel - Re: [PATCH v2] staging/comedi: remove unnecessary check around pci_dev

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Date:	Thu, 25 Jun 2015 15:39:21 +0100
From:	Ian Abbott <abbotti@....co.uk>
To:	Maninder Singh <maninder1.s@...sung.com>,
	hsweeten@...ionengravers.com, gregkh@...uxfoundation.org,
	devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org
CC:	pankaj.m@...sung.com
Subject: Re: [PATCH v2] staging/comedi: remove unnecessary check around pci_dev_put

On 25/06/15 12:14, Maninder Singh wrote:
> pci_dev_put checks for NULL pointer itself,
> reported by coccinelle
>
> Signed-off-by: Maninder Singh <maninder1.s@...sung.com>
> Reviewed-by: Yogesh Gaur <yn.gaur@...sung.com>
> ---
> v2: changelog typo cehcks -> checks
>
>   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 patch does no harm, but as mentioned by Dan Carpenter, if pcidev 
could be NULL (which it could be), we should keep the test for readability.

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