redonkable/alistair23-linux
redonkable/alistair23-linux
1
0
Fork 0
Code Releases Activity

s390/pci_dma: remove dma address range check

Browse source 
We calculate dma addresses using an iommu bitmap. Since commit
69eea95c ("s390/pci_dma: fix DMA table corruption with > 4 TB main memory")
we've made sure that addresses created using that bitmap are below
the maximum reported by firmware. Thus the additional check for
that address to be within range can be removed.

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>
This commit is contained in:
Sebastian Ott 2016-08-17 13:39:46 +02:00 committed by Martin Schwidefsky
parent bb2b7ffbc4
commit 3b13f1fea1
1 changed files with 0 additions and 5 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

5
arch/s390/pci/pci_dma.c
View file

@ -305,12 +305,7 @@ static dma_addr_t s390_dma_map_pages(struct device *dev, struct page *page,
/* Use rounded up size */
size = nr_pages * PAGE_SIZE;
dma_addr = zdev->start_dma + iommu_page_index * PAGE_SIZE;
if (dma_addr + size > zdev->end_dma) {
ret = -ERANGE;
goto out_free;
}
if (direction == DMA_NONE || direction == DMA_TO_DEVICE)
flags |= ZPCI_TABLE_PROTECTED;