target/linux/generic/patches-4.9/170-MIPS-PCI-scan-PCI-controllers-in-reverse-order.patch

   1 From: Mathias Kresin <dev@kresin.me>
   2 Date: Tue, 14 Mar 2017 22:12:12 +0100
   3 Subject: [PATCH v2] MIPS: PCI: scan PCI controllers in reverse order
   4
   5 Commit 23dac14d058f ("MIPS: PCI: Use struct list_head lists") changed
   6 the controller list from reverse to straight order without taking care
   7 of the changed order for the scan of the recorded PCI controllers.
   8
   9 Traverse the list in reverse order to restore the former behaviour.
  10
  11 This patches fixes the following PCI error on lantiq:
  12
  13   pci 0000:01:00.0: BAR 0: error updating (0x1c000004 != 0x000000)
  14
  15 Fixes: 23dac14d058f ("MIPS: PCI: Use struct list_head lists")
  16 Signed-off-by: Mathias Kresin <dev@kresin.me>
  17 ---
  18  arch/mips/pci/pci-legacy.c | 2 +-
  19  1 file changed, 1 insertion(+), 1 deletion(-)
  20
  21 --- a/arch/mips/pci/pci-legacy.c
  22 +++ b/arch/mips/pci/pci-legacy.c
  23 @@ -222,7 +222,7 @@ static int __init pcibios_init(void)
  24         struct pci_controller *hose;
  25
  26         /* Scan all of the recorded PCI controllers.  */
  27 -       list_for_each_entry(hose, &controllers, list)
  28 +       list_for_each_entry_reverse(hose, &controllers, list)
  29                 pcibios_scanbus(hose);
  30
  31         pci_fixup_irqs(pci_common_swizzle, pcibios_map_irq);