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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@kresin.me>
owl
Mathias Kresin 2017-03-17 07:29:16 +01:00
parent fce21ae4cc
commit 2f8d086baa
1 changed files with 31 additions and 0 deletions
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31
target/linux/generic/patches-4.9/170-MIPS-PCI-scan-PCI-controllers-in-reverse-order.patch Normal file
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@ -0,0 +1,31 @@
From: Mathias Kresin <dev@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@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);