[PATCH 4.5 075/200] iommu/dma: Restore scatterlist offsets correctly

Greg Kroah-Hartman
2016-05-03T01:14:56Z

From: Robin Murphy <robin.murphy@arm.com>

commit 07b48ac4bbe527e68cfc555f2b2b206908437141 upstream.

With the change to stashing just the IOVA-page-aligned remainder of the
CPU-page offset rather than the whole thing, the failure path in
__invalidate_sg() also needs tweaking to account for that in the case of
differing page sizes where the two offsets may not be equivalent.
Similarly in __finalise_sg(), lest the architecture-specific wrappers
later get the wrong address for cache maintenance on sync or unmap.

Fixes: 164afb1d85b8 ("iommu/dma: Use correct offset in map_sg")
Reported-by: Magnus Damm <damm+renesas@opensource.se>
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/iommu/dma-iommu.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/iommu/dma-iommu.c
+++ b/drivers/iommu/dma-iommu.c
@@ -403,7 +403,7 @@ static int __finalise_sg(struct device *
unsigned int s_length = sg_dma_len(s);
unsigned int s_dma_len = s->length;

- s->offset = s_offset;
+ s->offset += s_offset;
s->length = s_length;
sg_dma_address(s) = dma_addr + s_offset;
dma_addr += s_dma_len;
@@ -422,7 +422,7 @@ static void __invalidate_sg(struct scatt

for_each_sg(sg, s, nents, i) {
if (sg_dma_address(s) != DMA_ERROR_CODE)
- s->offset = sg_dma_address(s);
+ s->offset += sg_dma_address(s);
if (sg_dma_len(s))
s->length = sg_dma_len(s);
sg_dma_address(s) = DMA_ERROR_CODE;