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xen-pcifront: Use hotplug-safe pci_get_domain_bus_and_slot()

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Following code has a race window between pci_find_bus() and pci_get_slot()
if PCI hotplug operation happens between them which removes the pci_bus.
So use PCI hotplug safe interface pci_get_domain_bus_and_slot() instead,
which also reduces code complexity.

    struct pci_bus *pci_bus = pci_find_bus(domain, busno);
    struct pci_dev *pci_dev = pci_get_slot(pci_bus, devfn);

Tested-by: Konrad Rzeszutek Wilk <[email protected]>
Signed-off-by: Jiang Liu <[email protected]>
Signed-off-by: Bjorn Helgaas <[email protected]>
Acked-by: Konrad Rzeszutek Wilk <[email protected]>
This commit is contained in:
Jiang Liu 2012-08-28 23:43:58 +08:00 • committed by Bjorn Helgaas
commit 2ccc246d9c
1 changed files with 2 additions and 8 deletions
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10
drivers/pci/xen-pcifront.c
View file

@ -982,7 +982,6 @@ static int pcifront_detach_devices(struct pcifront_device *pdev)
int err = 0;
int i, num_devs;
unsigned int domain, bus, slot, func;
struct pci_bus *pci_bus;
struct pci_dev *pci_dev;
char str[64];
@ -1032,13 +1031,8 @@ static int pcifront_detach_devices(struct pcifront_device *pdev)
goto out;
}
pci_bus = pci_find_bus(domain, bus);
if (!pci_bus) {
dev_dbg(&pdev->xdev->dev, "Cannot get bus %04x:%02x\n",
domain, bus);
continue;
}
pci_dev = pci_get_slot(pci_bus, PCI_DEVFN(slot, func));
pci_dev = pci_get_domain_bus_and_slot(domain, bus,
PCI_DEVFN(slot, func));
if (!pci_dev) {
dev_dbg(&pdev->xdev->dev,
"Cannot get PCI device %04x:%02x:%02x.%d\n",