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

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commit 938f1bbe35e3a7cb07e1fa7c512e2ef8bb866bdf upstream.

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: fade1ec055dc ("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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Robin Murphy 2017-03-16 17:00:17 +00:00 committed by Greg Kroah-Hartman
parent d7fcb303d1
commit f0c31c674a
1 changed files with 1 additions and 2 deletions
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3
drivers/iommu/dma-iommu.c
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@ -112,8 +112,7 @@ 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);