Commit 53b1bc9a authored Jun 03, 2016 by Sebastian Ott Committed by Martin Schwidefsky Jun 13, 2016

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>

parent bb98f396

arch/s390/pci/pci_dma.c

+1 −0

Original line number	Diff line number	Diff line
		@@ -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);