[PATCH] powerpc/iommu: Fix iommu pool initialization
From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Date: 2012-07-13 08:01:35
Subsystem:
linux for powerpc (32-bit and 64-bit), the rest · Maintainers:
Madhavan Srinivasan, Linus Torvalds
The iommu pool patch has a bug where it would cause a crash when using only one pool (based on the size of the DMA window). Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> --- arch/powerpc/kernel/iommu.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/powerpc/kernel/iommu.c b/arch/powerpc/kernel/iommu.c
index fbefe72..ff5a6ce 100644
--- a/arch/powerpc/kernel/iommu.c
+++ b/arch/powerpc/kernel/iommu.c@@ -676,9 +676,9 @@ struct iommu_table *iommu_init_table(struct iommu_table *tbl, int nid) tbl->nr_pools = 1; /* We reserve the top 1/4 of the table for large allocations */ - tbl->poolsize = (tbl->it_size * 3 / 4) / IOMMU_NR_POOLS; + tbl->poolsize = (tbl->it_size * 3 / 4) / tbl->nr_pools; - for (i = 0; i < IOMMU_NR_POOLS; i++) { + for (i = 0; i < tbl->nr_pools; i++) { p = &tbl->pools[i]; spin_lock_init(&(p->lock)); p->start = tbl->poolsize * i;