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| author | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2014-01-14 12:03:14 -0700 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2014-01-14 12:14:25 -0700 |
| commit | c4ec84c7db0e4b01ed40cc2388f16ae5c6513cc0 (patch) | |
| tree | b280cdcdbf714b6709e8d87a0d157f4979cb73d7 /drivers/pci/hotplug/sgi_hotplug.c | |
| parent | 5ef68e8867ca9d979644d05c6045b2c79d8989de (diff) | |
| download | talos-obmc-linux-c4ec84c7db0e4b01ed40cc2388f16ae5c6513cc0.tar.gz talos-obmc-linux-c4ec84c7db0e4b01ed40cc2388f16ae5c6513cc0.zip | |
PCI: hotplug: Use global PCI rescan-remove locking
Multiple race conditions are possible between PCI hotplug and the generic
PCI bus rescan and device removal that can be triggered via sysfs.
To avoid those race conditions make PCI hotplug use global PCI
rescan-remove locking.
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Diffstat (limited to 'drivers/pci/hotplug/sgi_hotplug.c')
| -rw-r--r-- | drivers/pci/hotplug/sgi_hotplug.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/pci/hotplug/sgi_hotplug.c b/drivers/pci/hotplug/sgi_hotplug.c index 5b05a68cca6c..613043f7576f 100644 --- a/drivers/pci/hotplug/sgi_hotplug.c +++ b/drivers/pci/hotplug/sgi_hotplug.c @@ -459,12 +459,15 @@ static int enable_slot(struct hotplug_slot *bss_hotplug_slot) acpi_scan_lock_release(); } + pci_lock_rescan_remove(); + /* Call the driver for the new device */ pci_bus_add_devices(slot->pci_bus); /* Call the drivers for the new devices subordinate to PPB */ if (new_ppb) pci_bus_add_devices(new_bus); + pci_unlock_rescan_remove(); mutex_unlock(&sn_hotplug_mutex); if (rc == 0) @@ -540,6 +543,7 @@ static int disable_slot(struct hotplug_slot *bss_hotplug_slot) acpi_scan_lock_release(); } + pci_lock_rescan_remove(); /* Free the SN resources assigned to the Linux device.*/ list_for_each_entry_safe(dev, temp, &slot->pci_bus->devices, bus_list) { if (PCI_SLOT(dev->devfn) != slot->device_num + 1) @@ -550,6 +554,7 @@ static int disable_slot(struct hotplug_slot *bss_hotplug_slot) pci_stop_and_remove_bus_device(dev); pci_dev_put(dev); } + pci_unlock_rescan_remove(); /* Remove the SSDT for the slot from the ACPI namespace */ if (SN_ACPI_BASE_SUPPORT() && ssdt_id) { |
