drm/msm/dsi: Fix an error code in msm_dsi_modeset_init()

stable inclusion
from stable-5.10.75
commit 2c5658717428ae4f7c0ef8706b45f0d00821d744
bugzilla: 182987 https://gitee.com/openeuler/kernel/issues/I4I3MP

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=2c5658717428ae4f7c0ef8706b45f0d00821d744

--------------------------------

commit 739b4e77 upstream.

Return an error code if msm_dsi_manager_validate_current_config().
Don't return success.

Fixes: 8b03ad30 ("drm/msm/dsi: Use one connector for dual DSI mode")
Signed-off-by: NDan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: NDmitry Baryshkov <dmitry.baryshkov@linaro.org>
Link: https://lore.kernel.org/r/20211001123308.GF2283@kiliSigned-off-by: NDmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: NRob Clark <robdclark@chromium.org>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: NChen Jun <chenjun102@huawei.com>
Acked-by: NWeilong Chen <chenweilong@huawei.com>
Signed-off-by: NChen Jun <chenjun102@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>

drivers/gpu/drm/msm/dsi/dsi.c

@@ -208,8 +208,10 @@ int msm_dsi_modeset_init(struct msm_dsi *msm_dsi, struct drm_device *dev,
 		goto fail;
 	}
 
-	if (!msm_dsi_manager_validate_current_config(msm_dsi->id))
+	if (!msm_dsi_manager_validate_current_config(msm_dsi->id)) {
+		ret = -EINVAL;
 		goto fail;
+	}
 
 	msm_dsi->encoder = encoder;