alpha: fix iommu-related boot panic

This fixes a boot panic due to a typo in the recent iommu patchset from
FUJITA Tomonori <tomof@acm.org> - the code used dma_get_max_seg_size()
instead of dma_get_seg_boundary().

It also removes a couple of unnecessary BUG_ON() and ALIGN() macros.

Signed-off-by: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Reported-and-tested-by: Bob Tracy <rct@frus.com>
Acked-by: FUJITA Tomonori <tomof@acm.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 7 insertions, 8 deletions

diff --git a/arch/alpha/kernel/pci_iommu.c b/arch/alpha/kernel/pci_iommu.c
index be6fa105cd34..e07a23fc5b74 100644
--- a/arch/alpha/kernel/pci_iommu.c
+++ b/arch/alpha/kernel/pci_iommu.c
@@ -144,15 +144,14 @@ iommu_arena_find_pages(struct device *dev, struct pci_iommu_arena *arena,
         unsigned long base;
         unsigned long boundary_size;
 
-        BUG_ON(arena->dma_base & ~PAGE_MASK);
         base = arena->dma_base >> PAGE_SHIFT;
-        if (dev)
-                boundary_size = ALIGN(dma_get_max_seg_size(dev) + 1, PAGE_SIZE)
-                        >> PAGE_SHIFT;
-        else
-                boundary_size = ALIGN(1UL << 32, PAGE_SIZE) >> PAGE_SHIFT;
-
-        BUG_ON(!is_power_of_2(boundary_size));
+        if (dev) {
+                boundary_size = dma_get_seg_boundary(dev) + 1;
+                BUG_ON(!is_power_of_2(boundary_size));
+                boundary_size >>= PAGE_SHIFT;
+        } else {
+                boundary_size = 1UL << (32 - PAGE_SHIFT);
+        }
 
         /* Search forward for the first mask-aligned sequence of N free ptes */
         ptes = arena->ptes;