linux-kernel - Re: [PATCH 86/90] staging: comedi: rtd520: remove 'got

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Message-ID: <5007FE73.9050804@mev.co.uk>
Date:	Thu, 19 Jul 2012 13:32:51 +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 86/90] staging: comedi: rtd520: remove 'got_regions' from
 private data

On 2012-07-19 03:04, H Hartley Sweeten wrote:
> The 'got_regions' variable in the private data is used as a flag
> for the detach to know if the pci device has been enabled.
>
> Typically the dev->iobase variable is used to indicate this in
> all the other comedi drivers. Do the same here for consistancy.

As I mentioned for dt3000, dev->iobase isn't ideal for holding PCI 
memory addresses and is even less ideal to hold a PCI memory address 
that is passed to ioremap().

>
> 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/rtd520.c | 9 +++------
>   1 file changed, 3 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/staging/comedi/drivers/rtd520.c b/drivers/staging/comedi/drivers/rtd520.c
> index 02be4dd..aeccae9 100644
> --- a/drivers/staging/comedi/drivers/rtd520.c
> +++ b/drivers/staging/comedi/drivers/rtd520.c
> @@ -312,7 +312,6 @@ struct rtdPrivate {
>
>   	/* PCI device info */
>   	struct pci_dev *pci_dev;
> -	int got_regions;	/* non-zero if PCI regions owned */
>
>   	/* channel list info */
>   	/* chanBipolar tracks whether a channel is bipolar (and needs +2048) */
> @@ -1623,7 +1622,6 @@ static int rtd_attach(struct comedi_device *dev, struct comedi_devconfig *it)
>   	struct rtdPrivate *devpriv;
>   	struct comedi_subdevice *s;
>   	int ret;
> -	resource_size_t physLas0;	/* configuration */
>   	resource_size_t physLas1;	/* data area */
>   	resource_size_t physLcfg;	/* PLX9080 */
>   #ifdef USE_DMA
> @@ -1658,18 +1656,17 @@ static int rtd_attach(struct comedi_device *dev, struct comedi_devconfig *it)
>   		printk(KERN_INFO "Failed to enable PCI device and request regions.\n");
>   		return ret;
>   	}
> -	devpriv->got_regions = 1;
>
>   	/*
>   	 * Initialize base addresses
>   	 */
>   	/* Get the physical address from PCI config */
> -	physLas0 = pci_resource_start(devpriv->pci_dev, LAS0_PCIINDEX);
> +	dev->iobase = pci_resource_start(devpriv->pci_dev, LAS0_PCIINDEX);
>   	physLas1 = pci_resource_start(devpriv->pci_dev, LAS1_PCIINDEX);
>   	physLcfg = pci_resource_start(devpriv->pci_dev, LCFG_PCIINDEX);
>   	/* Now have the kernel map this into memory */
>   	/* ASSUME page aligned */
> -	devpriv->las0 = ioremap_nocache(physLas0, LAS0_PCISIZE);
> +	devpriv->las0 = ioremap_nocache(dev->iobase, LAS0_PCISIZE);

I suggest keeping the physLas0 variable for passing to ioremap_nocache() 
and just putting some dummy non-zero value in dev->iobase.

>   	devpriv->las1 = ioremap_nocache(physLas1, LAS1_PCISIZE);
>   	devpriv->lcfg = ioremap_nocache(physLcfg, LCFG_PCISIZE);
>
> @@ -2000,7 +1997,7 @@ static void rtd_detach(struct comedi_device *dev)
>   		if (devpriv->lcfg)
>   			iounmap(devpriv->lcfg);
>   		if (devpriv->pci_dev) {
> -			if (devpriv->got_regions)
> +			if (dev->iobase)
>   				comedi_pci_disable(devpriv->pci_dev);
>   			pci_dev_put(devpriv->pci_dev);
>   		}
>

-- 
-=( 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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