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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>
This commit is contained in:
Benjamin Herrenschmidt 2012-07-13 17:45:49 +10:00
parent af3bf7fbe0
commit dcd261ba58
1 changed files with 2 additions and 2 deletions
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4
arch/powerpc/kernel/iommu.c
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@ -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;