s390/pci_dma: remove dma address range check

We calculate dma addresses using an iommu bitmap. Since commit
69eea95 ("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 <[email protected]>
Reviewed-by: Gerald Schaefer <[email protected]>
Signed-off-by: Martin Schwidefsky <[email protected]>

Author: Sebastian Ott

arch/s390/pci/pci_dma.c

@@ -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;