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iommu/omap: Check for NULL in iopte_free()

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The iopte_free() function should check for NULL because
kmem_cache_free() will panic on NULL argument.

Signed-off-by: Zhouyi Zhou <yizhouzhou@ict.ac.cn>
Signed-off-by: Joerg Roedel <joro@8bytes.org>
This commit is contained in:
Zhouyi Zhou 2014-03-05 18:20:19 +08:00 committed by Joerg Roedel
parent 07a0203021
commit e28045ab2e
1 changed files with 2 additions and 1 deletions
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3
drivers/iommu/omap-iommu.c
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@ -520,7 +520,8 @@ 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)