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iommu/dma: Don't reserve PCI I/O windows 

Even if a host controller's CPU-side MMIO windows into PCI I/O space do
happen to leak into PCI memory space such that it might treat them as
peer addresses, trying to reserve the corresponding I/O space addresses
doesn't do anything to help solve that problem. Stop doing a silly thing.

Fixes: fade1ec055 ("iommu/dma: Avoid PCI host bridge windows")
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Robin Murphy 2017-03-16 17:00:17 +00:00 committed by Joerg Roedel
parent 9d3a4de4cb
commit 938f1bbe35
1 changed files with 1 additions and 2 deletions
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3
drivers/iommu/dma-iommu.c
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@ -175,8 +175,7 @@ static void iova_reserve_pci_windows(struct pci_dev *dev,
unsigned long lo, hi;
resource_list_for_each_entry(window, &bridge->windows) {
if (resource_type(window->res) != IORESOURCE_MEM &&
resource_type(window->res) != IORESOURCE_IO)
if (resource_type(window->res) != IORESOURCE_MEM)
continue;
lo = iova_pfn(iovad, window->res->start - window->offset);