iommu/tegra-smmu: Fix return value check in tegra_smmu_group_get()

In case of error, the function iommu_group_alloc() returns ERR_PTR() and
never returns NULL. The NULL test in the return value check should be
replaced with IS_ERR().

Fixes: 7f4c9176f760 ("iommu/tegra: Allow devices to be grouped")
Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Acked-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>

diff --git a/drivers/iommu/tegra-smmu.c b/drivers/iommu/tegra-smmu.c
index 8885635..44d40bc 100644 (file)
--- a/drivers/iommu/tegra-smmu.c
+++ b/drivers/iommu/tegra-smmu.c
@@ -832,7 +832,7 @@ static struct iommu_group *tegra_smmu_group_get(struct tegra_smmu *smmu,
        group->soc = soc;
 
        group->group = iommu_group_alloc();
-       if (!group->group) {
+       if (IS_ERR(group->group)) {
                devm_kfree(smmu->dev, group);
                mutex_unlock(&smmu->lock);
                return NULL;