[PATCH] PCI: check if bus has bridge device before triggering Secondary Bus Reset

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For devices attached to the root bus, we can't trigger Secondary Bus
Reset because there is no bridge device associated with the bus. So
need to check bus->self again NULL first before using it.

Signed-off-by: Yu Zhao <yu.zhao@xxxxxxxxx>
---
 drivers/pci/pci.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 6c93af5..20351a9 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -2171,7 +2171,7 @@ static int pci_parent_bus_reset(struct pci_dev *dev, int probe)
 	u16 ctrl;
 	struct pci_dev *pdev;
 
-	if (dev->subordinate)
+	if (dev->subordinate || !dev->bus->self)
 		return -ENOTTY;
 
 	list_for_each_entry(pdev, &dev->bus->devices, bus_list)
-- 
1.6.3.1

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