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

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Date:	Fri, 29 May 2009 11:19:56 -0600
From:	Grant Grundler <grundler@...isc-linux.org>
To:	Yu Zhao <yu.zhao@...el.com>
Cc:	jbarnes@...tuousgeek.org, linux-pci@...r.kernel.org,
	marc.c.dionne@...il.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] PCI: use fixed-up device class when configuring device

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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