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vfio/spapr: Add cond_resched() for huge updates

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Clearing very big IOMMU tables can trigger soft lockups. This adds
cond_resched() to allow the scheduler to do context switching when
it decides to.

Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
This commit is contained in:
Alexey Kardashevskiy 2017-10-02 12:39:11 -06:00 committed by Alex Williamson
parent cf0d53ba49
commit 5c2fefd882
1 changed files with 2 additions and 0 deletions
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drivers/vfio/vfio_iommu_spapr_tce.c
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@ -507,6 +507,8 @@ static int tce_iommu_clear(struct tce_container *container,
enum dma_data_direction direction;
for ( ; pages; --pages, ++entry) {
cond_resched();
direction = DMA_NONE;
oldhpa = 0;
ret = iommu_tce_xchg(tbl, entry, &oldhpa, &direction);