linux-kernel - Re: [PATCHv2 8/8] videobuf2: handle non-contiguous DMA allocations

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Message-ID: <YOf4vH24LFhUcL9Q@google.com>
Date:   Fri, 9 Jul 2021 16:20:28 +0900
From:   Sergey Senozhatsky <senozhatsky@...omium.org>
To:     Tomasz Figa <tfiga@...omium.org>
Cc:     Sergey Senozhatsky <senozhatsky@...omium.org>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Ricardo Ribalda <ribalda@...omium.org>,
        Christoph Hellwig <hch@....de>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCHv2 8/8] videobuf2: handle non-contiguous DMA allocations

On (21/07/07 23:10), Tomasz Figa wrote:
> > > >
> > > > I guess this should address the case when
> > > >
> > > > "after allocating the buffer, the buffer is exported as a dma_buf and
> > > > another device calls dma_buf_ops vb2_dc_dmabuf_ops_vmap, which in turn
> > > > calls dma_buf_map_set_vaddr(map, buf->vaddr); with a NULL buf->vaddr"
> > >
> > > Sorry, I fail to get what this is about. Where does this quote come from?
> >
> > Bottom half of https://lore.kernel.org/lkml/10a0903a-e295-5cba-683a-1eb89a0804ed@xs4all.nl/
> 
> I see, thanks for the pointer. Yes, vb2_dc_dmabuf_ops_vmap() needs to
> be changed so that it calls vb2_dc_vaddr() internally instead of
> relying on buf->vaddr directly.

Done.