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PCI: Fix bridge_d3 update on device removal 

Starting with v4.8, we allow a PCIe port to runtime suspend to D3hot if the
port itself and its children satisfy a number of conditions.  Once a child
is removed, we recheck those conditions in case the removed device was
blocking the port from suspending.

The rechecking needs to happen *after* the device has been removed from the
bus it resides on.  Otherwise when walking the port's subordinate bus in
pci_bridge_d3_update(), the device being removed would erroneously still be
taken into account.

However the device is removed from the bus_list in pci_destroy_dev() and we
currently recheck *before* that.  Fix it.

Fixes: 9d26d3a8f1 ("PCI: Put PCIe ports into D3 during suspend")
Signed-off-by: Lukas Wunner <lukas@wunner.de>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Acked-by: Rafael J. Wysocki <mika.westerberg@linux.intel.com>
hifive-unleashed-5.1
Lukas Wunner 2016-09-06 06:20:46 +02:00 committed by Bjorn Helgaas
parent 6af7e4f772
commit 035ee288ae
1 changed files with 1 additions and 2 deletions
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3
drivers/pci/remove.c
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@ -40,6 +40,7 @@ static void pci_destroy_dev(struct pci_dev *dev)
list_del(&dev->bus_list);
up_write(&pci_bus_sem);
pci_bridge_d3_device_removed(dev);
pci_free_resources(dev);
put_device(&dev->dev);
}
@ -96,8 +97,6 @@ static void pci_remove_bus_device(struct pci_dev *dev)
dev->subordinate = NULL;
}
pci_bridge_d3_device_removed(dev);
pci_destroy_dev(dev);
}