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PCI: Skip resource distribution when no hotplug bridges 

If "hotplug_bridges == 0", "!dev->is_hotplug_bridge" is always true, so the
loop that divides the remaining resources among hotplug-capable bridges
does nothing.

Check for "hotplug_bridges == 0" earlier, so we don't even have to compute
the amount of remaining resources.  No functional change intended.

Link: https://lore.kernel.org/r/PS2P216MB0642C7A485649D2D787A1C6F80000@PS2P216MB0642.KORP216.PROD.OUTLOOK.COM
Link: https://lore.kernel.org/r/20190622210310.180905-3-helgaas@kernel.org
Signed-off-by: Nicholas Johnson <nicholas.johnson-opensource@outlook.com.au>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Logan Gunthorpe <logang@deltatee.com>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
This commit is contained in:
Nicholas Johnson 2019-06-22 12:13:50 -05:00 committed by Bjorn Helgaas
parent 5c6bcc344b
commit 6a381ea694
1 changed files with 3 additions and 2 deletions
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5
drivers/pci/setup-bus.c
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@ -1892,6 +1892,9 @@ static void pci_bus_distribute_available_resources(struct pci_bus *bus,
return;
}
if (hotplug_bridges == 0)
return;
/*
* Calculate the total amount of extra resource space we can
* pass to bridges below this one. This is basically the
@ -1941,8 +1944,6 @@ static void pci_bus_distribute_available_resources(struct pci_bus *bus,
* Distribute available extra resources equally between
* hotplug-capable downstream ports taking alignment into
* account.
*
* Here hotplug_bridges is always != 0.
*/
align = pci_resource_alignment(bridge, io_res);
io = div64_ul(available_io, hotplug_bridges);