linux-kernel - Re: [RFC PATCH 2/3] usb, PCI: remove disable/enable device with non-xhci quirk

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Date:	Thu, 1 Mar 2012 12:10:50 -0800
From:	Sarah Sharp <sarah.a.sharp@...ux.intel.com>
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	linux-usb@...r.kernel.org, linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 2/3] usb, PCI: remove disable/enable device with
 non-xhci quirk

On Thu, Mar 01, 2012 at 11:24:02AM -0800, Yinghai Lu wrote:
> | commit cab928ee1f221c9cc48d6615070fefe2e444384a
> |    USB: Fix handoff when BIOS disables host PCI device.
> 
> mention only need to do disable/enable for xhci controller.
> 
> So just remove that for non-xhci controller and restore old behavior for them.

As I said, we do need to do the enable/disable for all USB hosts.  Jesse
Barnes confirms that the PCI core doesn't do that for us, so we can't
rely on the BIOS always enabling the PCI device.  I don't think we need
this patch, because we should always be doing the enable/disable for all
USB hosts.  We just never had a BIOS that caused this bug to be
discovered until the xHCI BIOS for the Intel system in question.

> Signed-off-by: Yinghai Lu <yinghai@...nel.org>
> 
> ---
>  drivers/usb/host/pci-quirks.c |   18 ------------------
>  1 file changed, 18 deletions(-)
> 
> Index: linux-2.6/drivers/usb/host/pci-quirks.c
> ===================================================================
> --- linux-2.6.orig/drivers/usb/host/pci-quirks.c
> +++ linux-2.6/drivers/usb/host/pci-quirks.c
> @@ -889,13 +889,7 @@ static void __devinit quirk_usb_early_ha
>  	if (pdev->vendor == 0x184e)	/* vendor Netlogic */
>  		return;
>  
> -	if (pci_enable_device(pdev) < 0) {
> -		dev_warn(&pdev->dev, "Can't enable PCI device, "
> -				"BIOS handoff failed.\n");
> -		return;
> -	}
>  	quirk_usb_handoff_uhci(pdev);
> -	pci_disable_device(pdev);
>  }
>  DECLARE_PCI_FIXUP_CLASS_FINAL(PCI_ANY_ID, PCI_ANY_ID,
>  		PCI_CLASS_SERIAL_USB_UHCI, 0, quirk_usb_early_handoff_uhci);
> @@ -908,13 +902,7 @@ static void __devinit quirk_usb_early_ha
>  	if (pdev->vendor == 0x184e)	/* vendor Netlogic */
>  		return;
>  
> -	if (pci_enable_device(pdev) < 0) {
> -		dev_warn(&pdev->dev, "Can't enable PCI device, "
> -				"BIOS handoff failed.\n");
> -		return;
> -	}
>  	quirk_usb_handoff_ohci(pdev);
> -	pci_disable_device(pdev);
>  }
>  DECLARE_PCI_FIXUP_CLASS_FINAL(PCI_ANY_ID, PCI_ANY_ID,
>  		PCI_CLASS_SERIAL_USB_OHCI, 0, quirk_usb_early_handoff_ohci);
> @@ -924,13 +912,7 @@ static void __devinit quirk_usb_early_ha
>  	if (pdev->vendor == 0x184e)	/* vendor Netlogic */
>  		return;
>  
> -	if (pci_enable_device(pdev) < 0) {
> -		dev_warn(&pdev->dev, "Can't enable PCI device, "
> -				"BIOS handoff failed.\n");
> -		return;
> -	}
>  	quirk_usb_handoff_ehci(pdev);
> -	pci_disable_device(pdev);
>  }
>  DECLARE_PCI_FIXUP_CLASS_FINAL(PCI_ANY_ID, PCI_ANY_ID,
>  		PCI_CLASS_SERIAL_USB_EHCI, 0, quirk_usb_early_handoff_ehci);
--
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