Hi Ricardo,
On 21/01/2025 22:14, Ricardo Ribalda wrote:
> When we obtain a reference to of a platform_device, we need to release
> it via put_device.
>
> Found by cocci:
> ./platform/nuvoton/npcm-video.c:1677:3-9: ERROR: missing put_device; call of_find_device_by_node on line 1667, but without a corresponding object release within this function.
> ./platform/nuvoton/npcm-video.c:1684:3-9: ERROR: missing put_device; call of_find_device_by_node on line 1667, but without a corresponding object release within this function.
> ./platform/nuvoton/npcm-video.c:1690:3-9: ERROR: missing put_device; call of_find_device_by_node on line 1667, but without a corresponding object release within this function.
> ./platform/nuvoton/npcm-video.c:1694:1-7: ERROR: missing put_device; call of_find_device_by_node on line 1667, but without a corresponding object release within this function.
This driver uses this construct:
struct device *ece_dev __free(put_device) = &ece_pdev->dev;
to automatically call put_device. So this patch would 'put' the device twice.
Does cocci understand constructs like this? If I hadn't looked closely at the
code first, I would just have merged it.
Regards,
Hans
>
> Cc: stable@xxxxxxxxxxxxxxx
> Fixes: 46c15a4ff1f4 ("media: nuvoton: Add driver for NPCM video capture and encoding engine")
> Signed-off-by: Ricardo Ribalda <ribalda@xxxxxxxxxxxx>
> ---
> drivers/media/platform/nuvoton/npcm-video.c | 3 +++
> 1 file changed, 3 insertions(+)
>
> diff --git a/drivers/media/platform/nuvoton/npcm-video.c b/drivers/media/platform/nuvoton/npcm-video.c
> index 024cd8ee1709..7b4c23dbe709 100644
> --- a/drivers/media/platform/nuvoton/npcm-video.c
> +++ b/drivers/media/platform/nuvoton/npcm-video.c
> @@ -1673,6 +1673,7 @@ static int npcm_video_ece_init(struct npcm_video *video)
>
> regs = devm_platform_ioremap_resource(ece_pdev, 0);
> if (IS_ERR(regs)) {
> + put_device(&ece_pdev->dev);
> dev_err(dev, "Failed to parse ECE reg in DTS\n");
> return PTR_ERR(regs);
> }
> @@ -1680,11 +1681,13 @@ static int npcm_video_ece_init(struct npcm_video *video)
> video->ece.regmap = devm_regmap_init_mmio(dev, regs,
> &npcm_video_ece_regmap_cfg);
> if (IS_ERR(video->ece.regmap)) {
> + put_device(&ece_pdev->dev);
> dev_err(dev, "Failed to initialize ECE regmap\n");
> return PTR_ERR(video->ece.regmap);
> }
>
> video->ece.reset = devm_reset_control_get(&ece_pdev->dev, NULL);
> + put_device(&ece_pdev->dev);
> if (IS_ERR(video->ece.reset)) {
> dev_err(dev, "Failed to get ECE reset control in DTS\n");
> return PTR_ERR(video->ece.reset);
>
