s390/pci: ensure page aligned dma start address

We don't have an architectural guarantee on the value of
the dma offset but rely on it to be at least page aligned.
Enforce page alignemt of start_dma.

Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Reviewed-by: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

diff --git a/arch/s390/pci/pci_dma.c b/arch/s390/pci/pci_dma.c
index 1ea8c07eab849e467e5678c7e3dc662c49090860..494eb832bcc5351376e31afb690ab298f5efb5c9 100644 (file)
--- a/arch/s390/pci/pci_dma.c
+++ b/arch/s390/pci/pci_dma.c
@@ -469,6 +469,7 @@ int zpci_dma_init_device(struct zpci_dev *zdev)
         * Also set zdev->end_dma to the actual end address of the usable
         * range, instead of the theoretical maximum as reported by hardware.
         */
+       zdev->start_dma = PAGE_ALIGN(zdev->start_dma);
        zdev->iommu_size = min3((u64) high_memory,
                                ZPCI_TABLE_SIZE_RT - zdev->start_dma,
                                zdev->end_dma - zdev->start_dma + 1);