linux-kernel - Re: pci probe

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Date:	Wed, 13 Jun 2007 11:39:57 +0400
From:	Manu Abraham <abraham.manu@...il.com>
To:	Greg KH <greg@...ah.com>
CC:	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: pci probe

Hi,

Sorry for my late reply.

Greg KH wrote:
>>> 	- your driver will not work on any pci-hotplug type system (that
>>> 	  includes expresscard and pccard and lots of high-end servers.
>> This doesn't matter
> 
> Are you sure?  PCI Hotplug is showing up in more places that people
> realize...


The PCI bridges that we have for the mentioned use, does not support
Hotplugging at all and hence doesn't matter for those devices mentioned.


>>> 	- your driver will not be notified if the system is being
>>> 	  suspended or resumed or wanting to drop into a low power
>>> 	  state.
>>> 	- another driver can bind to your device without you ever
>>> 	  knowing it.
>> These also sound bad.
>>
>>> So in short, use pci_probe and just handle the fact that you need to be
>>> called for two PCI devices and bind to both of them.  It shouldn't be
>>> that hard...
>> Thanks for the explanation.
>>
>> Do you mean to have two PCIID tables ? But then that does mean 2 modules
>> don't you ? (i thought probe would be called once per module) Or you
>> mean to say use PCI_ANY_ID in the table to match multiple devices and
>> then allow probe to return a list of devices ?
> 
> 
> No, you can specify multiple devices in the same device id table, and
> your driver will get called for all of the matching devices.  You just
> need to "bind" them together in your driver to be able to handle
> everything properly.  It shouldn't be that tough.
> 

Will take a go at it.
I was using PCI_ANY_ID for the device id, so that should return all the
devices.


Thanks,
Manu
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