Fix IOVA reserve failure for memory regions listed in dma-ranges in the
following cases.
- start address of memory region is 0x0.
- end address of a memory region is equal to start address of next memory
region.
Fixes: aadad097cd46f ("iommu/dma: Reserve IOVA for PCIe inaccessible DMA
address")
Signed-off-by: Srinath Mannam <srinath.man...@broadcom.com>
---
drivers/iommu/dma-iommu.c | 15 +++++++++++----
1 file changed, 11 insertions(+), 4 deletions(-)
diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c
index 5141d49a046b..0a3f67a4f9ae 100644
--- a/drivers/iommu/dma-iommu.c
+++ b/drivers/iommu/dma-iommu.c
@@ -213,14 +213,21 @@ static int iova_reserve_pci_windows(struct pci_dev *dev,
resource_list_for_each_entry(window, &bridge->dma_ranges) {
end = window->res->start - window->offset;
resv_iova:
+ if (end < start) {
+ /* dma_ranges list should be sorted */
+ dev_err(&dev->dev, "Failed to reserve IOVA\n");
+ return -EINVAL;
+ }
+ /*
+ * Skip the cases when start address of first memory region is
+ * 0x0 and end address of one memory region and start address
+ * of next memory region are equal. Reserve IOVA for rest of
+ * addresses fall in between given memory ranges.
+ */
if (end > start) {
lo = iova_pfn(iovad, start);
hi = iova_pfn(iovad, end);
reserve_iova(iovad, lo, hi);
- } else {
- /* dma_ranges list should be sorted */
- dev_err(&dev->dev, "Failed to reserve IOVA\n");
- return -EINVAL;
}
start = window->res->end - window->offset + 1;
--
2.17.1
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