[PATCH 5.10 152/663] drm: rcar-du: Fix the return check of of_parse_phandle and of_find_device_by_node

[Greg Kroah-Hartman]

From: Wang Xiaojun <wangxiaojun11@xxxxxxxxxx>

[ Upstream commit 8d7d33f6be06f929ac2c5e8ea2323fec272790d4 ]

of_parse_phandle and of_find_device_by_node may return NULL
which cannot be checked by IS_ERR.

Fixes: 8de707aeb452 ("drm: rcar-du: kms: Initialize CMM instances")
Signed-off-by: Wang Xiaojun <wangxiaojun11@xxxxxxxxxx>
Reported-by: Hulk Robot <hulkci@xxxxxxxxxx>
Acked-by: Jacopo Mondi <jacopo+renesas@xxxxxxxxxx>
Reviewed-by: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>
Reviewed-by: Kieran Bingham <kieran.bingham+renesas@xxxxxxxxxxxxxxxx>

[Replace -ENODEV with -EINVAL]

Reviewed-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@xxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 drivers/gpu/drm/rcar-du/rcar_du_kms.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/rcar-du/rcar_du_kms.c b/drivers/gpu/drm/rcar-du/rcar_du_kms.c
index 72dda446355fe..7015e22872bbe 100644
--- a/drivers/gpu/drm/rcar-du/rcar_du_kms.c
+++ b/drivers/gpu/drm/rcar-du/rcar_du_kms.c
@@ -700,10 +700,10 @@ static int rcar_du_cmm_init(struct rcar_du_device *rcdu)
 		int ret;
 
 		cmm = of_parse_phandle(np, "renesas,cmms", i);
-		if (IS_ERR(cmm)) {
+		if (!cmm) {
 			dev_err(rcdu->dev,
 				"Failed to parse 'renesas,cmms' property\n");
-			return PTR_ERR(cmm);
+			return -EINVAL;
 		}
 
 		if (!of_device_is_available(cmm)) {
@@ -713,10 +713,10 @@ static int rcar_du_cmm_init(struct rcar_du_device *rcdu)
 		}
 
 		pdev = of_find_device_by_node(cmm);
-		if (IS_ERR(pdev)) {
+		if (!pdev) {
 			dev_err(rcdu->dev, "No device found for CMM%u\n", i);
 			of_node_put(cmm);
-			return PTR_ERR(pdev);
+			return -EINVAL;
 		}
 
 		of_node_put(cmm);
-- 
2.27.0