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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>
hifive-unleashed-5.1
Sebastian Ott 2016-06-03 19:03:12 +02:00 committed by Martin Schwidefsky
parent bb98f396f1
commit 53b1bc9aba
1 changed files with 1 additions and 0 deletions
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arch/s390/pci/pci_dma.c
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@ -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);