linux-kernel - Re: [PATCH 15/90] staging: comedi: adv_pci1723: move comedi_pci

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Date:	Thu, 19 Jul 2012 10:37:44 +0100
From:	Ian Abbott <abbotti@....co.uk>
To:	H Hartley Sweeten <hartleys@...ionengravers.com>
CC:	Linux Kernel <linux-kernel@...r.kernel.org>,
	"devel@...verdev.osuosl.org" <devel@...verdev.osuosl.org>,
	Ian Abbott <ian.abbott@....co.uk>,
	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>
Subject: Re: [PATCH 15/90] staging: comedi: adv_pci1723: move comedi_pci_enable()
 into the attach

On 2012-07-19 02:30, H Hartley Sweeten wrote:
> Use pci_is_enabled() in the "find pci device" function to determine if
> the found pci device is not in use and move the comedi_pci_enable() call
> into the attach.
>
> Signed-off-by: H Hartley Sweeten <hsweeten@...ionengravers.com>
> Cc: Ian Abbott <abbotti@....co.uk>
> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> ---
>   drivers/staging/comedi/drivers/adv_pci1723.c | 10 +++++-----
>   1 file changed, 5 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/staging/comedi/drivers/adv_pci1723.c b/drivers/staging/comedi/drivers/adv_pci1723.c
> index f561a2a..e971fa6 100644
> --- a/drivers/staging/comedi/drivers/adv_pci1723.c
> +++ b/drivers/staging/comedi/drivers/adv_pci1723.c
> @@ -302,11 +302,7 @@ static struct pci_dev *pci1723_find_pci_dev(struct comedi_device *dev,
>   		}
>   		if (pcidev->vendor != PCI_VENDOR_ID_ADVANTECH)
>   			continue;
> -		/*
> -		 * Look for device that isn't in use.
> -		 * Enable PCI device and request regions.
> -		 */
> -		if (comedi_pci_enable(pcidev, "adv_pci1723"))
> +		if (pci_is_enabled(pcidev))
>   			continue;
>   		return pcidev;
>   	}

Just because the device is enabled doesn't mean that it is in use, so 
this change could skip over a perfectly good unused device.

If you want to move the comedi_pci_enable() call, this is a change in 
behaviour for this particular driver, but is consistent with most of the 
other Comedi PCI drivers (and the bus/slot options can be used to select 
a particular device).  This is probably a good thing, but you should 
take out the pci_is_enabled test.

> @@ -335,6 +331,10 @@ static int pci1723_attach(struct comedi_device *dev,
>   	if (!devpriv->pcidev)
>   		return -EIO;
>
> +	ret = comedi_pci_enable(devpriv->pcidev, "adv_pci1723");
> +	if (ret)
> +		return ret;
> +
>   	dev->iobase = pci_resource_start(devpriv->pcidev, 2);
>
>   	dev->board_name = this_board->name;
>


-- 
-=( 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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