Re: [PATCH,v2] drm/panel: Fix return value check in nt35950_probe()

[AngeloGioacchino Del Regno]

Il 17/03/22 09:37, Lu Wei ha scritto:

In function nt35950_probe(), mipi_dsi_device_register_full() is called
to create a MIPI DSI device. If it fails, a pointer encoded with an error
will be returned, so use IS_ERR() to check the return value. Besides, use
PTR_ERR to return the actual errno.

Fixes: 623a3531e9cf ("drm/panel: Add driver for Novatek NT35950 DSI DriverIC 
panels")
Signed-off-by: Lu Wei <luwe...@huawei.com>

Reviewed-by: AngeloGioacchino Del Regno 
<angelogioacchino.delre...@somainline.org>

Thanks!

---
  drivers/gpu/drm/panel/panel-novatek-nt35950.c | 4 ++--
  1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/panel/panel-novatek-nt35950.c 
b/drivers/gpu/drm/panel/panel-novatek-nt35950.c
index 288c7fa83ecc..d252e5e56228 100644
--- a/drivers/gpu/drm/panel/panel-novatek-nt35950.c
+++ b/drivers/gpu/drm/panel/panel-novatek-nt35950.c
@@ -579,9 +579,9 @@ static int nt35950_probe(struct mipi_dsi_device *dsi)
                }

nt->dsi[1] = mipi_dsi_device_register_full(dsi_r_host, info);

-               if (!nt->dsi[1]) {
+               if (IS_ERR(nt->dsi[1])) {
                        dev_err(dev, "Cannot get secondary DSI node\n");
-                       return -ENODEV;
+                       return PTR_ERR(nt->dsi[1]);
                }
                num_dsis++;
        }