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| author |   Sebastian Ott <sebott@linux.vnet.ibm.com> | 2016-06-03 19:05:38 +0200 |
|---|---|---|
| committer |   Martin Schwidefsky <schwidefsky@de.ibm.com> | 2016-06-13 15:58:24 +0200 |
| commit | 8ee2db3cf1dc02ff9f2c65ac8bd7f478ba79abbe (patch) | |
| tree | 18202aa8e0d9e2e55948c4a8a3b0215b93c3835b /arch | |
| parent | s390/pci: ensure page aligned dma start address (diff) | |
| download | linux-dev-8ee2db3cf1dc02ff9f2c65ac8bd7f478ba79abbe.tar.xz linux-dev-8ee2db3cf1dc02ff9f2c65ac8bd7f478ba79abbe.zip | |
s390/pci: ensure to not cross a dma segment boundary
When we use the iommu_area_alloc helper to get dma addresses
we specify the boundary_size parameter but not the offset (called
shift in this context).
As long as the offset (start_dma) is a multiple of the boundary
we're ok (on current machines start_dma always seems to be 4GB).
Don't leave this to chance and specify the offset for iommu_area_alloc.
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>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/s390/pci/pci_dma.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/s390/pci/pci_dma.c b/arch/s390/pci/pci_dma.c index 494eb832bcc5..070f1ae5cfad 100644 --- a/arch/s390/pci/pci_dma.c +++ b/arch/s390/pci/pci_dma.c @@ -226,7 +226,8 @@ static unsigned long __dma_alloc_iommu(struct device *dev, boundary_size = ALIGN(dma_get_seg_boundary(dev) + 1, PAGE_SIZE) >> PAGE_SHIFT; return iommu_area_alloc(zdev->iommu_bitmap, zdev->iommu_pages, - start, size, 0, boundary_size, 0); + start, size, zdev->start_dma >> PAGE_SHIFT, + boundary_size, 0); } static unsigned long dma_alloc_iommu(struct device *dev, int size) |