linux-kernel - [PATCH] alpha: fix iommu-related boot panic

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Date:	Sun, 9 Mar 2008 16:31:17 +0300
From:	Ivan Kokshaysky <ink@...assic.park.msu.ru>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Richard Henderson <rth@...ddle.net>,
	FUJITA Tomonori <tomof@....org>, rct@...s.com,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: [PATCH] alpha: fix iommu-related boot panic

Fix boot panic due to a typo in the recent iommu patchset from
FUJITA Tomonori <tomof@....org> - dma_get_max_seg_size()
instead of dma_get_seg_boundary().
This also removes a couple of unnecessary BUG_ON() and ALIGN() macros.

Signed-off-by: Ivan Kokshaysky <ink@...assic.park.msu.ru>
Reported-and-tested-by: Bob Tracy <rct@...s.com>
Acked-by: FUJITA Tomonori <tomof@....org>

Ivan.

---
 arch/alpha/kernel/pci_iommu.c |   15 +++++++--------
 1 files changed, 7 insertions(+), 8 deletions(-)

diff --git a/arch/alpha/kernel/pci_iommu.c b/arch/alpha/kernel/pci_iommu.c
index be6fa10..e07a23f 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;
--
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