linux-kernel - [PATCH] drm/rockchip: return ERR

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Date:   Thu, 10 Nov 2016 22:10:56 +0100
From:   Julia Lawall <Julia.Lawall@...6.fr>
To:     Mark Yao <mark.yao@...k-chips.com>
Cc:     kernel-janitors@...r.kernel.org, David Airlie <airlied@...ux.ie>,
        Heiko Stuebner <heiko@...ech.de>,
        dri-devel@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>
Subject: [PATCH] drm/rockchip: return ERR_PTR instead of NULL

rockchip_drm_framebuffer_init is only used in one case, in
rockchip_drm_fbdev.c, where its return value is tested using IS_ERR.  To
enable propagating the reason for the error, change the definition so that
it returns an ERR_PTR value.

Problem found with the help of Coccinelle.

Signed-off-by: Julia Lawall <Julia.Lawall@...6.fr>

---
 drivers/gpu/drm/rockchip/rockchip_drm_fb.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_fb.c b/drivers/gpu/drm/rockchip/rockchip_drm_fb.c
index 0f6eda0..01e11bf 100644
--- a/drivers/gpu/drm/rockchip/rockchip_drm_fb.c
+++ b/drivers/gpu/drm/rockchip/rockchip_drm_fb.c
@@ -213,7 +213,7 @@ struct drm_framebuffer *
 
 	rockchip_fb = rockchip_fb_alloc(dev, mode_cmd, &obj, 1);
 	if (IS_ERR(rockchip_fb))
-		return NULL;
+		return ERR_CAST(rockchip_fb);
 
 	return &rockchip_fb->fb;
 }