linux-kernel - Re: [RFC PATCH 4/5] media: ov6650: Fix frame scaling not reset on crop

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Message-ID: <20190602203657.jirbekewlh7tykmj@valkosipuli.retiisi.org.uk>
Date:   Sun, 2 Jun 2019 23:36:57 +0300
From:   Sakari Ailus <sakari.ailus@....fi>
To:     Janusz Krzysztofik <jmkrzyszt@...il.com>
Cc:     Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 4/5] media: ov6650: Fix frame scaling not reset on
 crop

Hi Janusz,

On Sun, Jun 02, 2019 at 11:58:23AM +0200, Janusz Krzysztofik wrote:
> Hi Sakari,
> 
> On Sunday, June 2, 2019 12:37:55 AM CEST Sakari Ailus wrote:
> > 
> > ... I realised that the subtle effect of "media:
> > ov6650: Register with asynchronous subdevice framework" is that the driver
> > is now responsible for serialising the access to its own data structures
> > now. 
> 
> Indeed, I must have been not thinking much while preparing it, only following 
> patterns from other implementations blindly, sorry.

No worries. I missed it at the time, too...

> 
> > And it doesn't do that. Could you submit a fix, please? It'd be good to
> > get that to 5.2 through the fixes branch.
> 
> How about dropping that V4L2_SUBDEV_FL_HAS_DEVNODE flag for now?  I think that 
> will be the most safe approach for a quick fix.  I'd then re-add it together 
> with proper locking in a separate patch later.  What do yo think?

Sure. Then we just re-introduce the flag when the driver is ready for that.

-- 
Regards,

Sakari Ailus