linux-kernel - Re: [PATCH] PCI: use fixed-up device class when configuring device

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Message-ID: <4A2333CF.2040601@intel.com>
Date:	Mon, 01 Jun 2009 09:50:07 +0800
From:	Yu Zhao <yu.zhao@...el.com>
To:	"jbarnes@...tuousgeek.org" <jbarnes@...tuousgeek.org>
CC:	Grant Grundler <grundler@...isc-linux.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"marc.c.dionne@...il.com" <marc.c.dionne@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] PCI: use fixed-up device class when configuring device

Hi Jesse,

Can you please take this fix for 2.6.30 RC if possible? It fixes a 
regression introduced by the SR-IOV patch series.

Thanks,
Yu

Grant Grundler wrote:
> On Thu, May 28, 2009 at 12:25:05AM +0800, Yu Zhao wrote:
>> The device class may be changed after the early fixup. Need to
>> re-read the class value from pci_dev when configuring the device.
>> Otherwise some devices such as JMicron SATA controller won't work.
> 
> I looked at pci_setup_device() and was thinking pci_fixup_device()
> should be called before pci_cfg_space_size() and thus avoid having
> to setup local "class" variable twice. pci_cfg_space_size() only
> seems to care if the device is a PCI_CLASS_BRIDGE_HOST (or not).
> 
> But dev->class has to be set up in any case and the current order
> makes more sense to me.
> 
> Reviewed-by: Grant Grundler <grundler@...isc-linux.org>
> 
> thanks,
> grant
> 
>> Tested-by: Marc Dionne <marc.c.dionne@...il.com>
>> Signed-off-by: Yu Zhao <yu.zhao@...el.com>
>> ---
>>  drivers/pci/probe.c |    2 ++
>>  1 files changed, 2 insertions(+), 0 deletions(-)
>>
>> diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
>> index e3c3e08..f1ae247 100644
>> --- a/drivers/pci/probe.c
>> +++ b/drivers/pci/probe.c
>> @@ -745,6 +745,8 @@ int pci_setup_device(struct pci_dev *dev)
>>  
>>  	/* Early fixups, before probing the BARs */
>>  	pci_fixup_device(pci_fixup_early, dev);
>> +	/* device class may be changed after fixup */
>> +	class = dev->class >> 8;
>>  
>>  	switch (dev->hdr_type) {		    /* header type */
>>  	case PCI_HEADER_TYPE_NORMAL:		    /* standard header */
>> -- 
>> 1.6.1
>>
>> --
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