From: Joerg Roedel <jroedel@xxxxxxx>
3.12-stable review patch. If anyone has any objections, please let me know.
===============
commit e6aabee05f41c9d18e0b92194819edd84f352ac9 upstream.
Handle this case to make sure boundary_size does not become
0 and trigger a BUG_ON later.
Signed-off-by: Joerg Roedel <jroedel@xxxxxxx>
Signed-off-by: Jiri Slaby <jslaby@xxxxxxx>
---
drivers/iommu/amd_iommu.c | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)
diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index b853bb47fc7d..d22b4af761f5 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -1750,14 +1750,16 @@ static unsigned long dma_ops_area_alloc(struct device *dev,
unsigned long next_bit = dom->next_address % APERTURE_RANGE_SIZE;
int max_index = dom->aperture_size >> APERTURE_RANGE_SHIFT;
int i = start >> APERTURE_RANGE_SHIFT;
- unsigned long boundary_size;
+ unsigned long boundary_size, mask;
unsigned long address = -1;
unsigned long limit;
next_bit >>= PAGE_SHIFT;
- boundary_size = ALIGN(dma_get_seg_boundary(dev) + 1,
- PAGE_SIZE) >> PAGE_SHIFT;
+ mask = dma_get_seg_boundary(dev);
+
+ boundary_size = mask + 1 ? ALIGN(mask + 1, PAGE_SIZE) >> PAGE_SHIFT :
+ 1UL << (BITS_PER_LONG - PAGE_SHIFT);
for (;i < max_index; ++i) {
unsigned long offset = dom->aperture[i]->offset >> PAGE_SHIFT;
--
2.6.2
--
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