linux-kernel - Re: [PATCH 32/90] staging: comedi: amplc_pc236: store the pci_dev in the comedi

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Message-ID: <5007E1C9.1040509@mev.co.uk>
Date:	Thu, 19 Jul 2012 11:30:33 +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 32/90] staging: comedi: amplc_pc236: store the pci_dev
 in the comedi_device

On 2012-07-19 02:39, 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.

The detach() routine should really check thisboard->bustype for 
robustness, as NULL hw_dev doesn't necessarily mean its a PCI device. 
The original code should have checked thisboard->bustype too although it 
works by accident because dev->iobase is 0.

-- 
-=( 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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