linux-kernel - Re: [PATCH 00/30] staging: comedi: move 'struct pci_dev *' into comedi

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Message-ID: <20120712100213.4be0e50f@pyramind.ukuu.org.uk>
Date:	Thu, 12 Jul 2012 10:02:13 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Ian Abbott <abbotti@....co.uk>
Cc:	H Hartley Sweeten <hartleys@...ionengravers.com>,
	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 00/30] staging: comedi: move 'struct pci_dev *' into
 comedi_device

> I suppose at a later date we could turn that into a union with a short
> name like u (so comedidev->pcidev would become something like
> comedidev->u.pcidev), which would allow us to stick a 'struct
> usb_interface *' or some other hardware device wrapper struct pointer in
> the same hole.  (Maybe 'h' for 'hardware' would be better than 'u'.)

The "usual" pattern is to make it a struct device pointer. Then you can
get to any other kind of device from it.

Alan
 
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