On 21/02/2025 10:04, Hans Verkuil wrote:
> 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.
Oh wait, now that I am reading the following patches I see that it was those later
patches that add the __free code.
This is far too confusing. Please post a v2 that just combines the 'fix references'
and 'use cleanup.h macros' in a single patch. It makes no sense to have this two-phase
approach.
Regards,
Hans
>
> 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);
>>
>
>
