[PATCH] iommu: sprd: Avoid NULL deref in sprd_iommu_hw_en

[Artem Chernyshev]

In sprd_iommu_cleanup() before calling function sprd_iommu_hw_en()
dom->sdev is equal to NULL, which leads to null dereference.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Fixes: 9afea57384d4 ("iommu/sprd: Release dma buffer to avoid memory leak")
Signed-off-by: Artem Chernyshev <artem.chernyshev@xxxxxxxxxxx>
---
 drivers/iommu/sprd-iommu.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iommu/sprd-iommu.c b/drivers/iommu/sprd-iommu.c
index ba53571a8239..a2f4ffe6d949 100644
--- a/drivers/iommu/sprd-iommu.c
+++ b/drivers/iommu/sprd-iommu.c
@@ -232,8 +232,8 @@ static void sprd_iommu_cleanup(struct sprd_iommu_domain *dom)
 
 	pgt_size = sprd_iommu_pgt_size(&dom->domain);
 	dma_free_coherent(dom->sdev->dev, pgt_size, dom->pgt_va, dom->pgt_pa);
-	dom->sdev = NULL;
 	sprd_iommu_hw_en(dom->sdev, false);
+	dom->sdev = NULL;
 }
 
 static void sprd_iommu_domain_free(struct iommu_domain *domain)
-- 
2.44.0