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Message-ID: <a62d30fb-4a97-4edc-a0de-dbe442449818@xs4all.nl>
Date: Tue, 7 Jan 2025 13:11:56 +0100
From: Hans Verkuil <hverkuil@...all.nl>
To: Sakari Ailus <sakari.ailus@...ux.intel.com>,
 Lubomir Rintel <lrintel@...hat.com>
Cc: Mauro Carvalho Chehab <mchehab@...nel.org>, linux-media@...r.kernel.org,
 linux-kernel@...r.kernel.org, Lubomir Rintel <lkundrak@...sk>,
 stable@...r.kernel.org
Subject: Re: [PATCH] media/mmp: Bring back registration of the device

On 07/01/2025 12:30, Sakari Ailus wrote:
> Hi Lubomir,
> 
> Thanks for the patch.
> 
> On Tue, Dec 31, 2024 at 08:04:34PM +0100, Lubomir Rintel wrote:
>> In commit 4af65141e38e ("media: marvell: cafe: Register V4L2 device
>> earlier"), a call to v4l2_device_register() was moved away from
>> mccic_register() into its caller, marvell/cafe's cafe_pci_probe().
>> This is not the only caller though -- there's also marvell/mmp.
>>
>> Add v4l2_device_register() into mmpcam_probe() to unbreak the MMP camera
>> driver, in a fashion analogous to what's been done to the Cafe driver.
>> Same for the teardown path.
>>
>> Fixes: 4af65141e38e ("media: marvell: cafe: Register V4L2 device earlier")
>> Signed-off-by: Lubomir Rintel <lkundrak@...sk>
>> Cc: stable@...r.kernel.org # v6.6+
>> ---
>>  drivers/media/platform/marvell/mmp-driver.c | 21 +++++++++++++++++----
>>  1 file changed, 17 insertions(+), 4 deletions(-)
>>
>> diff --git a/drivers/media/platform/marvell/mmp-driver.c b/drivers/media/platform/marvell/mmp-driver.c
>> index 3fd4fc1b9c48..d3da7ebb4a2b 100644
>> --- a/drivers/media/platform/marvell/mmp-driver.c
>> +++ b/drivers/media/platform/marvell/mmp-driver.c
>> @@ -231,13 +231,23 @@ static int mmpcam_probe(struct platform_device *pdev)
>>  
>>  	mcam_init_clk(mcam);
>>  
>> +	/*
>> +	 * Register with V4L.
>> +	 */
>> +
>> +	ret = v4l2_device_register(mcam->dev, &mcam->v4l2_dev);
> 
> I'd do this just before initialising the notifier (as in the patch in
> Fixes: tag): registering the V4L2 device requires probably severe memory
> pressure while it's entirely plausible there's no endpoint for the device.

Actually, v4l2_device_register does very little. No memory allocation is involved.

I was planning to take this patch as-is.

Regards,

	Hans

> 
>> +	if (ret)
>> +		return ret;
>> +
>>  	/*
>>  	 * Create a match of the sensor against its OF node.
>>  	 */
>>  	ep = fwnode_graph_get_next_endpoint(of_fwnode_handle(pdev->dev.of_node),
>>  					    NULL);
>> -	if (!ep)
>> -		return -ENODEV;
>> +	if (!ep) {
>> +		ret = -ENODEV;
>> +		goto out_v4l2_device_unregister;
>> +	}
>>  
>>  	v4l2_async_nf_init(&mcam->notifier, &mcam->v4l2_dev);
>>  
>> @@ -246,7 +256,7 @@ static int mmpcam_probe(struct platform_device *pdev)
>>  	fwnode_handle_put(ep);
>>  	if (IS_ERR(asd)) {
>>  		ret = PTR_ERR(asd);
>> -		goto out;
>> +		goto out_v4l2_device_unregister;
>>  	}
>>  
>>  	/*
>> @@ -254,7 +264,7 @@ static int mmpcam_probe(struct platform_device *pdev)
>>  	 */
>>  	ret = mccic_register(mcam);
>>  	if (ret)
>> -		goto out;
>> +		goto out_v4l2_device_unregister;
>>  
>>  	/*
>>  	 * Add OF clock provider.
>> @@ -283,6 +293,8 @@ static int mmpcam_probe(struct platform_device *pdev)
>>  	return 0;
>>  out:
> 
> For clarity, it'd be best to rename the out label to something more
> specific, i.e. out_mccic_shutdown. Either way,
> 
> Reviewed-by: Sakari Ailus <sakari.ailus@...ux.intel.com>
> 
>>  	mccic_shutdown(mcam);
>> +out_v4l2_device_unregister:
>> +	v4l2_device_unregister(&mcam->v4l2_dev);
>>  
>>  	return ret;
>>  }
>> @@ -293,6 +305,7 @@ static void mmpcam_remove(struct platform_device *pdev)
>>  	struct mcam_camera *mcam = &cam->mcam;
>>  
>>  	mccic_shutdown(mcam);
>> +	v4l2_device_unregister(&mcam->v4l2_dev);
>>  	pm_runtime_force_suspend(mcam->dev);
>>  }
>>  
> 


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