[PATCH] drm/nouveau/tegra: remove needless NULL check

[Guo Zhengkui]

There has already been NULL check in clk_prepare_enable() and
clk_disable_unprepare(), so remove needless NULL check before
calling them.

Signed-off-by: Guo Zhengkui <guozheng...@vivo.com>
---
 drivers/gpu/drm/nouveau/nvkm/engine/device/tegra.c | 14 +++++---------
 1 file changed, 5 insertions(+), 9 deletions(-)

diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/device/tegra.c 
b/drivers/gpu/drm/nouveau/nvkm/engine/device/tegra.c
index 2ed528c065fa..ac9e122586bc 100644
--- a/drivers/gpu/drm/nouveau/nvkm/engine/device/tegra.c
+++ b/drivers/gpu/drm/nouveau/nvkm/engine/device/tegra.c
@@ -41,11 +41,9 @@ nvkm_device_tegra_power_up(struct nvkm_device_tegra *tdev)
        ret = clk_prepare_enable(tdev->clk);
        if (ret)
                goto err_clk;
-       if (tdev->clk_ref) {
-               ret = clk_prepare_enable(tdev->clk_ref);
-               if (ret)
-                       goto err_clk_ref;
-       }
+       ret = clk_prepare_enable(tdev->clk_ref);
+       if (ret)
+               goto err_clk_ref;
        ret = clk_prepare_enable(tdev->clk_pwr);
        if (ret)
                goto err_clk_pwr;
@@ -70,8 +68,7 @@ nvkm_device_tegra_power_up(struct nvkm_device_tegra *tdev)
 err_clamp:
        clk_disable_unprepare(tdev->clk_pwr);
 err_clk_pwr:
-       if (tdev->clk_ref)
-               clk_disable_unprepare(tdev->clk_ref);
+       clk_disable_unprepare(tdev->clk_ref);
 err_clk_ref:
        clk_disable_unprepare(tdev->clk);
 err_clk:
@@ -87,8 +84,7 @@ nvkm_device_tegra_power_down(struct nvkm_device_tegra *tdev)
        int ret;
 
        clk_disable_unprepare(tdev->clk_pwr);
-       if (tdev->clk_ref)
-               clk_disable_unprepare(tdev->clk_ref);
+       clk_disable_unprepare(tdev->clk_ref);
        clk_disable_unprepare(tdev->clk);
        udelay(10);
 
-- 
2.20.1