iommu/mediatek: Remove unnecessary check in attach_device

This priv_data is set in the of_xlate. if of_xlate failed, it should
not enter attach_device. remove the unnecessary check.

Signed-off-by: Yong Wu <yong.wu@mediatek.com>
Reviewed-by: Tomasz Figa <tfiga@chromium.org>
Link: https://lore.kernel.org/r/20210111111914.22211-32-yong.wu@mediatek.com
Signed-off-by: Will Deacon <will@kernel.org>

diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c
index 7403a7c..084fb43 100644 (file)
--- a/drivers/iommu/mtk_iommu.c
+++ b/drivers/iommu/mtk_iommu.c
@@ -453,9 +453,6 @@ static int mtk_iommu_attach_device(struct iommu_domain *domain,
        struct device *m4udev = data->dev;
        int ret, domid;
 
-       if (!data)
-               return -ENODEV;
-
        domid = mtk_iommu_get_domain_id(dev, data->plat_data);
        if (domid < 0)
                return domid;
@@ -492,9 +489,6 @@ static void mtk_iommu_detach_device(struct iommu_domain *domain,
 {
        struct mtk_iommu_data *data = dev_iommu_priv_get(dev);
 
-       if (!data)
-               return;
-
        mtk_iommu_config(data, dev, false, 0);
 }