drm/rcar-du: Fix return value check in rcar_du_lvdsenc_get_resources()

In case of error, the function devm_ioremap_resource() returns ERR_PTR()
and never returns NULL. The NULL test in the return value check should be
replaced with IS_ERR(). Also remove the dev_err call to avoid redundant
error message.

Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn>
[Remove the unneeded mem == NULL check]
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 2 insertions, 11 deletions

diff --git a/drivers/gpu/drm/rcar-du/rcar_du_lvdsenc.c b/drivers/gpu/drm/rcar-du/rcar_du_lvdsenc.c
index a0f6a1781925..fe1f6f59f539 100644
--- a/drivers/gpu/drm/rcar-du/rcar_du_lvdsenc.c
+++ b/drivers/gpu/drm/rcar-du/rcar_du_lvdsenc.c
@@ -144,18 +144,9 @@ static int rcar_du_lvdsenc_get_resources(struct rcar_du_lvdsenc *lvds,
         sprintf(name, "lvds.%u", lvds->index);
 
         mem = platform_get_resource_byname(pdev, IORESOURCE_MEM, name);
-        if (mem == NULL) {
-                dev_err(&pdev->dev, "failed to get memory resource for %s\n",
-                        name);
-                return -EINVAL;
-        }
-
         lvds->mmio = devm_ioremap_resource(&pdev->dev, mem);
-        if (lvds->mmio == NULL) {
-                dev_err(&pdev->dev, "failed to remap memory resource for %s\n",
-                        name);
-                return -ENOMEM;
-        }
+        if (IS_ERR(lvds->mmio))
+                return PTR_ERR(lvds->mmio);
 
         lvds->clock = devm_clk_get(&pdev->dev, name);
         if (IS_ERR(lvds->clock)) {