diff mbox series

[11/13] drm/sun4i: Drop node references while building component list

Message ID 759c74e3a22b97ca066ef7910ca4b91b852011e6.1785772659.git.jernej.skrabec@gmail.com (mailing list archive)
State New
Headers
Series [01/13] drm/sun4i: Fix V3s YUV scanline size |

Commit Message

Jernej Škrabec Aug. 3, 2026, 4:10 p.m. UTC 
Two references are leaked every time the display pipeline is walked:
the output port node in sun4i_drv_traverse_endpoints(), which was never
released since the driver was introduced, and each node taken out of
the endpoint fifo in sun4i_drv_probe(), which stopped being released
when the fifo was introduced. The latter is still safe to drop right
after processing, since drm_of_component_match_add() takes its own
reference.

Fixes: 9026e0d122ac ("drm: Add Allwinner A10 Display Engine support")
Fixes: 8b11aaface2b ("drm/sun4i: Implement endpoint parsing using kfifo")
Signed-off-by: Jernej Skrabec <jernej.skrabec@gmail.com>
---
 drivers/gpu/drm/sun4i/sun4i_drv.c | 3 +++
 1 file changed, 3 insertions(+)

Comments

Chen-Yu Tsai Aug. 3, 2026, 5:10 p.m. UTC | #1 
On Tue, Aug 4, 2026 at 12:11 AM Jernej Skrabec <jernej.skrabec@gmail.com> wrote:
>
> Two references are leaked every time the display pipeline is walked:
> the output port node in sun4i_drv_traverse_endpoints(), which was never
> released since the driver was introduced, and each node taken out of
> the endpoint fifo in sun4i_drv_probe(), which stopped being released
> when the fifo was introduced. The latter is still safe to drop right
> after processing, since drm_of_component_match_add() takes its own
> reference.
>
> Fixes: 9026e0d122ac ("drm: Add Allwinner A10 Display Engine support")
> Fixes: 8b11aaface2b ("drm/sun4i: Implement endpoint parsing using kfifo")
> Signed-off-by: Jernej Skrabec <jernej.skrabec@gmail.com>

Acked-by: Chen-Yu Tsai <wens@kernel.org>

> ---
>  drivers/gpu/drm/sun4i/sun4i_drv.c | 3 +++
>  1 file changed, 3 insertions(+)
>
> diff --git a/drivers/gpu/drm/sun4i/sun4i_drv.c b/drivers/gpu/drm/sun4i/sun4i_drv.c
> index 8a409eee1dca..e9baca360160 100644
> --- a/drivers/gpu/drm/sun4i/sun4i_drv.c
> +++ b/drivers/gpu/drm/sun4i/sun4i_drv.c
> @@ -289,6 +289,8 @@ static void sun4i_drv_traverse_endpoints(struct endpoint_list *list,
>
>                 kfifo_put(&list->fifo, remote);
>         }
> +
> +       of_node_put(port);
>  }
>
>  static int sun4i_drv_add_endpoints(struct device *dev,
> @@ -394,6 +396,7 @@ static int sun4i_drv_probe(struct platform_device *pdev)
>                 /* process this endpoint */
>                 ret = sun4i_drv_add_endpoints(&pdev->dev, &list, &match,
>                                               endpoint);
> +               of_node_put(endpoint);
>
>                 /* sun4i_drv_add_endpoints can fail to allocate memory */
>                 if (ret < 0)
> --
> 2.43.0
>
diff mbox series

Patch

diff --git a/drivers/gpu/drm/sun4i/sun4i_drv.c b/drivers/gpu/drm/sun4i/sun4i_drv.c
index 8a409eee1dca..e9baca360160 100644
--- a/drivers/gpu/drm/sun4i/sun4i_drv.c
+++ b/drivers/gpu/drm/sun4i/sun4i_drv.c
@@ -289,6 +289,8 @@  static void sun4i_drv_traverse_endpoints(struct endpoint_list *list,
 
 		kfifo_put(&list->fifo, remote);
 	}
+
+	of_node_put(port);
 }
 
 static int sun4i_drv_add_endpoints(struct device *dev,
@@ -394,6 +396,7 @@  static int sun4i_drv_probe(struct platform_device *pdev)
 		/* process this endpoint */
 		ret = sun4i_drv_add_endpoints(&pdev->dev, &list, &match,
 					      endpoint);
+		of_node_put(endpoint);
 
 		/* sun4i_drv_add_endpoints can fail to allocate memory */
 		if (ret < 0)