From: Stefan Assmann <sassmann@xxxxxxxxxx>
pci_find_upstream_pcie_bridge() should take the pci_bus_sem semaphore while
reading global PCI structures.
Signed-off-by: Stefan Assmann <sassmann@xxxxxxxxxx>
Acked-by: Jesse Barnes <jbarnes@xxxxxxxxxxxxxxxx>
---
drivers/pci/search.c | 4 ++++
1 files changed, 4 insertions(+), 0 deletions(-)
diff --git a/drivers/pci/search.c b/drivers/pci/search.c
index 9d75dc8..c8159b0 100644
--- a/drivers/pci/search.c
+++ b/drivers/pci/search.c
@@ -29,6 +29,8 @@ pci_find_upstream_pcie_bridge(struct pci_dev *pdev)
if (pci_is_pcie(pdev))
return NULL;
+
+ down_read(&pci_bus_sem);
while (1) {
if (pci_is_root_bus(pdev->bus))
break;
@@ -38,6 +40,7 @@ pci_find_upstream_pcie_bridge(struct pci_dev *pdev)
tmp = pdev;
continue;
}
+ up_read(&pci_bus_sem);
/* PCI device should connect to a PCIe bridge */
if (pdev->pcie_type != PCI_EXP_TYPE_PCI_BRIDGE) {
/* Busted hardware? */
@@ -46,6 +49,7 @@ pci_find_upstream_pcie_bridge(struct pci_dev *pdev)
}
return pdev;
}
+ up_read(&pci_bus_sem);
return tmp;
}
--
1.7.3.2
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