Re: [PATCH v2] staging: comedi: resolve section mismatch in s626

[Greg KH <gregkh@linuxfoundation.org>]

On Mon, Mar 19, 2012 at 03:46:49PM -0700, Gerard Snitselaar wrote:
> On Mon, Mar 19, 2012 at 09:43:25AM -0700, Gerard Snitselaar wrote:
> > On Mon, Mar 19, 2012 at 09:31:03AM -0700, Greg KH wrote:
> > > 
> > > Ick, why is this loop even needed?  We are only here if the pci device
> > > is present in the system so this shouldn't be needed at all, right?
> > > 
> > > Or is this a bit more complex than I am making it out to be?
> > > 
> > > greg k-h
> > 
> > Most likely not. I will take a look at some of the other drivers in
> > comedi and see how the attach code looks there. I believe the code
> > section in hpdi_attach() was written by the same person. Unfortunately
> > I don't have a device to actually play around and see what changes are
> > doing.
> > 
> 
> I looked at this a bit more. It looks like they lose visibility to the
> pci_dev structure.
> 
> *_probe() 
>    comedi_pci_auto_config()     pci_dev
>       comedi_auto_config()      pci_dev->dev
>          comedi_device_attach() ??
>             driv->attach()      ?? <= iterate through pci devices.
> 
> Most of the examples I have looked at so far use for_each_pci_dev() to
> find the device, and s626 shortcuts it a bit by directly making calls
> to pci_get_subsys() with specific ids. They all verify they have the
> right device by checking the bus and slot that are grabbed from the
> pci_dev in comedi_pci_auto_config() and passed down.

Ugh, surely there's a way to keep the pci dev through the
comedi_device_attach() call, right?

How about asking this on the comedi mailing list?