From: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>
Date: Tue, 17 Feb 2009 05:16:13 +0000 (+0900)
Subject: PCI: fix wrong assumption in pci_common_swizzle
X-Git-Tag: firefly_0821_release~14994^2~48
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=c74d724462d1845535667f4d3f720e02e3432e53;p=firefly-linux-kernel-4.4.55.git

PCI: fix wrong assumption in pci_common_swizzle

Current pci_common_swizzle() seems to have a assumption that
pci_bus->self is NULL on the pci root bus. But it might not be true on
some platforms. Because of this wrong assumption, pci_common_swizzle()
might cause endless loop. We must check pci_bus->parent instead.

Signed-off-by: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
---

diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 0cfed9e28ea1..8310dc2f943b 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -1504,7 +1504,7 @@ u8 pci_common_swizzle(struct pci_dev *dev, u8 *pinp)
 {
 	u8 pin = *pinp;
 
-	while (dev->bus->self) {
+	while (dev->bus->parent) {
 		pin = pci_swizzle_interrupt_pin(dev, pin);
 		dev = dev->bus->self;
 	}