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authorGerald Schaefer <gerald.schaefer@de.ibm.com>2013-04-22 21:27:17 +0400
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2013-04-23 12:18:16 +0400
commit186f50fa568a221fdabd6753341c2de4abd24b78 (patch)
treeaec34a12d243f9819f1debc49a6f91481af6b6fd /arch/s390
parent63dd9b44ac926d3250c1e8dfcb309c37c870fe21 (diff)
downloadlinux-186f50fa568a221fdabd6753341c2de4abd24b78.tar.xz
s390/pci: return correct dma address for offset > PAGE_SIZE
For offset > PAGE_SIZE, s390_dma_map_pages() will issue a warning and return a wrong dma address. This patch removes the warning and fixes the dma return address calculation. Signed-off-by: Gerald Schaefer <gerald.schaefer@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390')
-rw-r--r--arch/s390/pci/pci_dma.c4
1 files changed, 1 insertions, 3 deletions
diff --git a/arch/s390/pci/pci_dma.c b/arch/s390/pci/pci_dma.c
index 60e4999e6b67..f8e69d5bc0a9 100644
--- a/arch/s390/pci/pci_dma.c
+++ b/arch/s390/pci/pci_dma.c
@@ -269,8 +269,6 @@ static dma_addr_t s390_dma_map_pages(struct device *dev, struct page *page,
int flags = ZPCI_PTE_VALID;
dma_addr_t dma_addr;
- WARN_ON_ONCE(offset > PAGE_SIZE);
-
/* This rounds up number of pages based on size and offset */
nr_pages = iommu_num_pages(pa, size, PAGE_SIZE);
iommu_page_index = dma_alloc_iommu(zdev, nr_pages);
@@ -292,7 +290,7 @@ static dma_addr_t s390_dma_map_pages(struct device *dev, struct page *page,
if (!dma_update_trans(zdev, pa, dma_addr, size, flags)) {
atomic64_add(nr_pages, (atomic64_t *) &zdev->fmb->mapped_pages);
- return dma_addr + offset;
+ return dma_addr + (offset & ~PAGE_MASK);
}
out_free: