Commit 5c5fb3c3 authored by Bjorn Helgaas's avatar Bjorn Helgaas
Browse files

PCI: Skip allocate_resource() if too little space available 

pci_bus_alloc_from_region() allocates MMIO space by iterating through all
the resources available on the bus.  The available resource might be
reduced if the caller requires 32-bit space or we're avoiding BIOS or E820
areas.

Don't bother calling allocate_resource() if we need more space than is
available in this resource.  This prevents some pointless and annoying
messages about avoided areas.

Link: https://lore.kernel.org/r/20221208190341.1560157-3-helgaas@kernel.org


Signed-off-by: default avatarBjorn Helgaas <bhelgaas@google.com>
Acked-by: default avatarHans de Goede <hdegoede@redhat.com>
parent 07eab090

drivers/pci/bus.c

+4 −0
Original line number Diff line number Diff line
@@ -197,6 +197,10 @@ static int pci_bus_alloc_from_region(struct pci_bus *bus, struct resource *res, 


		max = avail.end;



		/* Don't bother if available space isn't large enough */

		if (size > max - min_used + 1)

			continue;



		/* Ok, try it out.. */

		ret = allocate_resource(r, res, size, min_used, max,

					align, alignf, alignf_data);