linux-kernel - Re: [PATCH 30/90] staging: comedi: amplc_dio200: store the pci_dev in the comedi

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Message-ID: <5007E0FE.4030602@mev.co.uk>
Date:	Thu, 19 Jul 2012 11:27:10 +0100
From:	Ian Abbott <abbotti@....co.uk>
To:	Ian Abbott <ian.abbott@....co.uk>
CC:	H Hartley Sweeten <hartleys@...ionengravers.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	"devel@...verdev.osuosl.org" <devel@...verdev.osuosl.org>,
	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>
Subject: Re: [PATCH 30/90] staging: comedi: amplc_dio200: store the pci_dev
 in the comedi_device

On 2012-07-19 11:10, Ian Abbott wrote:
> On 2012-07-19 02:37, H Hartley Sweeten wrote:
>> Use the hw_dev pointer in the comedi_device struct to hold the
>> pci_dev instead of carrying it in the private data.
>>
>> Since the pci_dev is no longer held in the provate data, we can
>> also cleanup the detach a bit. Remove the IS_ENABLED() tests in
>> the detach. If the pci_dev is non NULL it's a PCI device otherwise
>> it's an ISA device. Using IS_ENABLED() to omit the code paths
>> makes the code a bit confusing and doesn't save much.
>
> No, you really need to check thisboard->bustype in the detach() because
> hw_dev might be NULL for a PCI board if the attach() failed.

Actually, your patch wouldn't do any harm as dev->iobase would be 0.  It 
would just go through the "failed ISA device" path instead of the 
"failed PCI device" path.  It would be more robust to check 
thisboard->bustype though.

-- 
-=( 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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