Revert "USB: Work around BIOS bugs by quiescing USB controllers earlier"
authorLinus Torvalds <torvalds@linux-foundation.org>
Sun, 11 Oct 2009 22:57:57 +0000 (15:57 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Sun, 11 Oct 2009 22:57:57 +0000 (15:57 -0700)
This reverts commit db8be50c4307dac2b37305fc59c8dc0f978d09ea, as per

http://bugzilla.kernel.org/show_bug.cgi?id=14374
http://marc.info/?l=linux-kernel&m=125446885705223&w=4

We simply can't do the USB handoff at FIXUP_HEADER time, since it will
often require us to have valid IO mappings etc.  But that in turn
requires a whole different approach, not this trivial one-liner.

Maybe we could teach all the USB quirk handoff handlers to only do the
quirk if the device has all its registers set up (since if it isn't
initialized, it's unlikely to be active), but regardless that will need
a whole lot more code than just saying "let's do it really early".

The proper fix is almost certainly to just leave the legacy IOMMU
mappings active until after all devices have been initialized.

Reported-by: Nick Piggin <npiggin@suse.de>
Cc: David Woodhouse <David.Woodhouse@intel.com>
Cc: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
drivers/usb/host/pci-quirks.c

index 23cf3bde476262d417ded0792a87933cb58efb36..83b5f9cea85ac9f43af8d3b1eb87a259517cc05c 100644 (file)
@@ -475,4 +475,4 @@ static void __devinit quirk_usb_early_handoff(struct pci_dev *pdev)
        else if (pdev->class == PCI_CLASS_SERIAL_USB_XHCI)
                quirk_usb_handoff_xhci(pdev);
 }
-DECLARE_PCI_FIXUP_HEADER(PCI_ANY_ID, PCI_ANY_ID, quirk_usb_early_handoff);
+DECLARE_PCI_FIXUP_FINAL(PCI_ANY_ID, PCI_ANY_ID, quirk_usb_early_handoff);