powerpc/iommu: Fix iommu pool initialization
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>
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 @@
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;