[source] kernel: add MIPS pci fix send upstream

[LEDE Commits]

mkresin pushed a commit to source.git, branch master:
https://git.lede-project.org/2f8d086baa83dd36859fc4af83e5c8db885fd850

commit 2f8d086baa83dd36859fc4af83e5c8db885fd850
Author: Mathias Kresin <dev at kresin.me>
AuthorDate: Fri Mar 17 07:29:16 2017 +0100

    kernel: add MIPS pci fix send upstream
    
    Upstream commit 23dac14d058f ("MIPS: PCI: Use struct list_head lists")
    changed the controller list from reverse to straight order without
    taking care of the changed order for the scan of the recorded PCI
    controllers.
    
    Traverse the list in reverse order to restore the former behaviour.
    
    This patches fixes the following PCI error on lantiq:
    
      pci 0000:01:00.0: BAR 0: error updating (0x1c000004 != 0x000000)
    
    Signed-off-by: Mathias Kresin <dev at kresin.me>
---
 ...PCI-scan-PCI-controllers-in-reverse-order.patch | 31 ++++++++++++++++++++++
 1 file changed, 31 insertions(+)

diff --git a/target/linux/generic/patches-4.9/170-MIPS-PCI-scan-PCI-controllers-in-reverse-order.patch b/target/linux/generic/patches-4.9/170-MIPS-PCI-scan-PCI-controllers-in-reverse-order.patch
new file mode 100644
index 0000000..74b54e9
--- /dev/null
+++ b/target/linux/generic/patches-4.9/170-MIPS-PCI-scan-PCI-controllers-in-reverse-order.patch
@@ -0,0 +1,31 @@
+From: Mathias Kresin <dev at kresin.me>
+Date: Tue, 14 Mar 2017 22:12:12 +0100
+Subject: [PATCH v2] MIPS: PCI: scan PCI controllers in reverse order
+
+Commit 23dac14d058f ("MIPS: PCI: Use struct list_head lists") changed
+the controller list from reverse to straight order without taking care
+of the changed order for the scan of the recorded PCI controllers.
+
+Traverse the list in reverse order to restore the former behaviour.
+
+This patches fixes the following PCI error on lantiq:
+
+  pci 0000:01:00.0: BAR 0: error updating (0x1c000004 != 0x000000)
+
+Fixes: 23dac14d058f ("MIPS: PCI: Use struct list_head lists")
+Signed-off-by: Mathias Kresin <dev at kresin.me>
+---
+ arch/mips/pci/pci-legacy.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+--- a/arch/mips/pci/pci-legacy.c
++++ b/arch/mips/pci/pci-legacy.c
+@@ -222,7 +222,7 @@ static int __init pcibios_init(void)
+ 	struct pci_controller *hose;
+ 
+ 	/* Scan all of the recorded PCI controllers.  */
+-	list_for_each_entry(hose, &controllers, list)
++	list_for_each_entry_reverse(hose, &controllers, list)
+ 		pcibios_scanbus(hose);
+ 
+ 	pci_fixup_irqs(pci_common_swizzle, pcibios_map_irq);