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| author | Nicholas Johnson <nicholas.johnson-opensource@outlook.com.au> | 2019-06-22 12:13:50 -0500 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2019-07-02 13:56:54 -0500 |
| commit | 6a381ea694c9da31ba8741c42a7f1b206c156841 (patch) | |
| tree | 96b2edcbdb5b28dad0abb3f23f1cb2be3463769a /drivers/pci/setup-bus.c | |
| parent | 5c6bcc344b18dfb3b0ddcca6c26f6858879f73bf (diff) | |
| download | talos-op-linux-6a381ea694c9da31ba8741c42a7f1b206c156841.tar.gz talos-op-linux-6a381ea694c9da31ba8741c42a7f1b206c156841.zip | |
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>
Diffstat (limited to 'drivers/pci/setup-bus.c')
| -rw-r--r-- | drivers/pci/setup-bus.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c index ee5be219dd41..79b1fa6519be 100644 --- a/drivers/pci/setup-bus.c +++ b/drivers/pci/setup-bus.c @@ -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); |
