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PCI: Skip allocate_resource() if too little space available

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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 <bhelgaas@google.com>
Acked-by: Hans de Goede <hdegoede@redhat.com>
This commit is contained in:
Bjorn Helgaas 2022-12-08 13:03:39 -06:00
parent 07eab0901e
commit 5c5fb3c3a7
1 changed files with 4 additions and 0 deletions
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4
drivers/pci/bus.c
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@ -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);