From: Bjorn Helgaas Date: Thu, 8 Dec 2022 19:03:39 +0000 (-0600) Subject: PCI: Skip allocate_resource() if too little space available X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=5c5fb3c3a793b34554e1d21f07cda34308b082cd;p=linux.git 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: Bjorn Helgaas Acked-by: Hans de Goede --- diff --git a/drivers/pci/bus.c b/drivers/pci/bus.c index 3cef835b375f..83ae838ceb5f 100644 --- a/drivers/pci/bus.c +++ b/drivers/pci/bus.c @@ -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);