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authorLukas Wunner <lukas@wunner.de>2016-10-28 10:52:06 +0200
committerBjorn Helgaas <bhelgaas@google.com>2016-11-17 18:44:56 -0600
commit1ed276a7b9d84626e5243fc54863440c74a4100a (patch)
tree6fa65a3a3c7125f6574f25bf37576b29f373f3ab /drivers/pci/remove.c
parent738a7edbfc7b623e276686dead046c9f3aae6b2e (diff)
downloadlinux-1ed276a7b9d84626e5243fc54863440c74a4100a.tar.gz
PCI: Autosense device removal in pci_bridge_d3_update()
The algorithm to update the flag indicating whether a bridge may go to D3
makes a few optimizations based on whether the update was caused by the
removal of a device on the one hand, versus the addition of a device or the
change of its D3cold flags on the other hand.

The information whether the update pertains to a removal is currently
passed in by the caller, but the function may as well determine that itself
by examining the device in question, thereby allowing for a considerable
simplification and reduction of the code.

Out of several options to determine removal, I've chosen the function
device_is_registered() because it's cheap:  It merely returns the
dev->kobj.state_in_sysfs flag.  That flag is set through device_add() when
the root bus is scanned and cleared through device_remove().  The call to
pci_bridge_d3_update() happens after each of these calls, respectively, so
the ordering is correct.

No functional change intended.

Tested-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Lukas Wunner <lukas@wunner.de>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/pci/remove.c')
-rw-r--r--drivers/pci/remove.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/pci/remove.c b/drivers/pci/remove.c
index f9357e09e9b3..73a03d382590 100644
--- a/drivers/pci/remove.c
+++ b/drivers/pci/remove.c
@@ -40,7 +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_bridge_d3_update(dev);
 	pci_free_resources(dev);
 	put_device(&dev->dev);
 }