drm/exynos: exynos_drm_ipp: fix return value check

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

Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn>
Reviewed-by: Tomasz Figa <t.figa@samsung.com>
Signed-off-by: Inki Dae <inki.dae@samsung.com>

diff --git a/drivers/gpu/drm/exynos/exynos_drm_ipp.c b/drivers/gpu/drm/exynos/exynos_drm_ipp.c
index b1ef8e7..0eb8538 100644 (file)
--- a/drivers/gpu/drm/exynos/exynos_drm_ipp.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_ipp.c
@@ -342,10 +342,10 @@ int exynos_drm_ipp_get_property(struct drm_device *drm_dev, void *data,
                 */
                ippdrv = ipp_find_obj(&ctx->ipp_idr, &ctx->ipp_lock,
                                                prop_list->ipp_id);
-               if (!ippdrv) {
+               if (IS_ERR(ippdrv)) {
                        DRM_ERROR("not found ipp%d driver.\n",
                                        prop_list->ipp_id);
-                       return -EINVAL;
+                       return PTR_ERR(ippdrv);
                }
 
                prop_list = ippdrv->prop_list;
@@ -970,9 +970,9 @@ int exynos_drm_ipp_queue_buf(struct drm_device *drm_dev, void *data,
        /* find command node */
        c_node = ipp_find_obj(&ctx->prop_idr, &ctx->prop_lock,
                qbuf->prop_id);
-       if (!c_node) {
+       if (IS_ERR(c_node)) {
                DRM_ERROR("failed to get command node.\n");
-               return -EFAULT;
+               return PTR_ERR(c_node);
        }
 
        /* buffer control */
@@ -1106,9 +1106,9 @@ int exynos_drm_ipp_cmd_ctrl(struct drm_device *drm_dev, void *data,
 
        c_node = ipp_find_obj(&ctx->prop_idr, &ctx->prop_lock,
                cmd_ctrl->prop_id);
-       if (!c_node) {
+       if (IS_ERR(c_node)) {
                DRM_ERROR("invalid command node list.\n");
-               return -EINVAL;
+               return PTR_ERR(c_node);
        }
 
        if (!exynos_drm_ipp_check_valid(ippdrv->dev, cmd_ctrl->ctrl,