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[2/2] include: linux: Update gather only if it's not NULL

Message ID 20240717100619.108250-2-amhetre@nvidia.com (mailing list archive)
State New, archived
Headers show
Series [1/2] iommu: Optimize IOMMU UnMap | expand

Commit Message

Ashish Mhetre July 17, 2024, 10:06 a.m. UTC 
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@nvidia.com>
---
 include/linux/iommu.h | 3 +++
 1 file changed, 3 insertions(+)
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Patch

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