Gather can be NULL when unmap is called for freeing old table while
mapping. If it's NULL then there is no need to add page for syncing
the TLB.
Signed-off-by: Ashish Mhetre <amhetre@xxxxxxxxxx>
---
include/linux/iommu.h | 3 +++
1 file changed, 3 insertions(+)
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index 4d47f2c33311..2a28c1ef8517 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -928,6 +928,9 @@ static inline void iommu_iotlb_gather_add_page(struct iommu_domain *domain,
struct iommu_iotlb_gather *gather,
unsigned long iova, size_t size)
{
+ if (!gather)
+ return;
+
/*
* If the new page is disjoint from the current range or is mapped at
* a different granularity, then sync the TLB so that the gather
--
2.25.1
