Commit d1a313e4 authored Apr 29, 2014 by Bjorn Helgaas

PCI: Reject BAR above 4GB if dma_addr_t is too small



We can only handle BARs above 4GB if dma_addr_t (not resource_size_t) is 64
bits wide.  If we have a 64-bit resource_size_t and a 32-bit dma_addr_t,
we can't deal with BARs above 4GB.

Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

parent 23b13bc7

drivers/pci/probe.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -253,7 +253,7 @@ int __pci_read_base(struct pci_dev *dev, enum pci_bar_type type,
		goto out;
		}

		if ((sizeof(resource_size_t) < 8) && l) {
		if ((sizeof(dma_addr_t) < 8) && l) {
		/* Address above 32-bit boundary; disable the BAR */
		pci_write_config_dword(dev, pos, 0);
		pci_write_config_dword(dev, pos + 4, 0);