parisc: fix IOMMU's device boundary overflow bug on 32bits arch

On 32bits boxes, boundary_size becomes zero due to a overflow and we
hit BUG_ON in iommu_is_span_boundary.

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Cc: Kyle McMartin <kyle@parisc-linux.org>
Cc: Matthew Wilcox <matthew@wil.cx>
Acked-by: Grant Grundler <grundler@parisc-linux.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 2 insertions, 2 deletions

diff --git a/drivers/parisc/sba_iommu.c b/drivers/parisc/sba_iommu.c
index e834127a8505..bdbe780e21c5 100644
--- a/drivers/parisc/sba_iommu.c
+++ b/drivers/parisc/sba_iommu.c
@@ -341,8 +341,8 @@ sba_search_bitmap(struct ioc *ioc, struct device *dev,
         unsigned long shift;
         int ret;
 
-        boundary_size = ALIGN(dma_get_seg_boundary(dev) + 1, 1 << IOVP_SHIFT);
-        boundary_size >>= IOVP_SHIFT;
+        boundary_size = ALIGN((unsigned long long)dma_get_seg_boundary(dev) + 1,
+                              1ULL << IOVP_SHIFT) >> IOVP_SHIFT;
 
 #if defined(ZX1_SUPPORT)
         BUG_ON(ioc->ibase & ~IOVP_MASK);