linux-kernel - Re: [PATCH v2 2/3] media: uapi: Add VP9 stateless decoder controls

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Message-ID: <20200502203707.402ea3cd@collabora.com>
Date:   Sat, 2 May 2020 20:37:07 +0200
From:   Boris Brezillon <boris.brezillon@...labora.com>
To:     Ezequiel Garcia <ezequiel@...labora.com>
Cc:     Hans Verkuil <hverkuil@...all.nl>, linux-media@...r.kernel.org,
        linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Tomasz Figa <tfiga@...omium.org>, kernel@...labora.com,
        Jonas Karlman <jonas@...boo.se>,
        Heiko Stuebner <heiko@...ech.de>,
        Alexandre Courbot <acourbot@...omium.org>,
        Jeffrey Kardatzke <jkardatzke@...omium.org>
Subject: Re: [PATCH v2 2/3] media: uapi: Add VP9 stateless decoder controls

On Fri, 01 May 2020 13:57:49 -0300
Ezequiel Garcia <ezequiel@...labora.com> wrote:

> > > +
> > > +.. tabularcolumns:: |p{1.5cm}|p{6.3cm}|p{9.4cm}|
> > > +
> > > +.. flat-table:: enum v4l2_vp9_reset_frame_context
> > > +    :header-rows:  0
> > > +    :stub-columns: 0
> > > +    :widths:       1 2
> > > +
> > > +    * - ``V4L2_VP9_RESET_FRAME_CTX_NONE``
> > > +      - Do not reset any frame context.
> > > +    * - ``V4L2_VP9_RESET_FRAME_CTX_NONE_ALT``
> > > +      - Do not reset any frame context. This is an alternative value for
> > > +        V4L2_VP9_RESET_FRAME_CTX_NONE.  
> > 
> > Add `` around V4L2_VP9_RESET_FRAME_CTX_NONE.
> >   
> 
> Hm, now that I look closer, what's the point
> of having the NONE_ALT in our uAPI if it
> has same meaning as NONE?
> 
> I think it can be removed.

The intent was to match the spec so that one can pass the value
extracted from the bitstream directly.

> > 
> > I got several smatch warnings:
> > 
> > smatch: ERRORS
> > drivers/media/v4l2-core/v4l2-ctrls.c:1880 validate_vp9_frame_decode_params() warn: was && intended here instead of ||?
> > 
> > (Commented on this ^^^ one above)
> > 
> > drivers/staging/media/rkvdec/rkvdec-vp9.c:426 init_intra_only_probs() error: buffer overflow 'ptr' 9 <= 69
> > drivers/staging/media/rkvdec/rkvdec-vp9.c:1478 rkvdec_vp9_done() error: potentially dereferencing uninitialized 'ctrl'.
> > drivers/staging/media/rkvdec/rkvdec-vp9.c:1483 rkvdec_vp9_done() error: uninitialized symbol 'dec_dst_buf'.
> > drivers/staging/media/rkvdec/rkvdec-vp9.c:941:6: warning: variable 'ret' set but not used [-Wunused-but-set-variable]
> > drivers/staging/media/rkvdec/rkvdec-vp9.c:1466:40: warning: variable 'fctx' set but not used [-Wunused-but-set-variable]
> >   
> 
> Oh, I'll run smatch and fix them all.

Oops!