[PATCH v2] IOMMU: iopte free should check wether input argument is NULL

[Zhouyi Zhou]

From: Zhouyi Zhou <zhouzhouyi@xxxxxxxxx>

iopte free should check wether input argument is NULL because kmem_cache_free
will panic on NULL argument 

Signed-off-by: Zhouyi Zhou <yizhouzhou@xxxxxxxxx>
Signed-off-by: Joerg Roedel <joro@xxxxxxxxxx>

---
 drivers/iommu/omap-iommu.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/drivers/iommu/omap-iommu.c b/drivers/iommu/omap-iommu.c
index bcd78a7..51211e8 100644
--- a/drivers/iommu/omap-iommu.c
+++ b/drivers/iommu/omap-iommu.c
@@ -523,7 +523,8 @@ static void flush_iopte_range(u32 *first, u32 *last)
 static void iopte_free(u32 *iopte)
 {
 	/* Note: freed iopte's must be clean ready for re-use */
-	kmem_cache_free(iopte_cachep, iopte);
+	if (iopte)
+		kmem_cache_free(iopte_cachep, iopte);
 }
 
 static u32 *iopte_alloc(struct omap_iommu *obj, u32 *iopgd, u32 da)


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