Guests might put new TCEs without clearing them first and the PAPR spec
allows that.
This adds put_page() for TCEs which we just replaced.
Signed-off-by: Alexey Kardashevskiy <a...@ozlabs.ru>
---
arch/powerpc/kernel/iommu.c | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)
diff --git a/arch/powerpc/kernel/iommu.c b/arch/powerpc/kernel/iommu.c
index ccf7510..f8bf641 100644
--- a/arch/powerpc/kernel/iommu.c
+++ b/arch/powerpc/kernel/iommu.c
@@ -1057,11 +1057,11 @@ int iommu_tce_build(struct iommu_table *tbl, unsigned
long entry,
spin_lock(&(pool->lock));
- oldtce = ppc_md.tce_get(tbl, entry);
- /* Add new entry if it is not busy */
- if (!(oldtce & (TCE_PCI_WRITE | TCE_PCI_READ)))
- ret = ppc_md.tce_build(tbl, entry, 1, hwaddr, NULL,
- direction, NULL);
+ ret = ppc_md.tce_build(tbl, entry, 1, hwaddr, &oldtce,
+ direction, NULL);
+
+ if (oldtce & (TCE_PCI_WRITE | TCE_PCI_READ))
+ put_page(pfn_to_page(__pa(oldtce) >> PAGE_SHIFT));
spin_unlock(&(pool->lock));
--
2.0.0
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