linux-kernel - Re: [Mjpeg-users] [PATCH] media: zoran: move to dma-mapping interface

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Message-ID: <9841d9a0-fd2e-96a6-3092-d12efa92ea6c@utanet.at>
Date:   Wed, 25 Apr 2018 19:27:49 +0200
From:   Bernhard Praschinger <shadowlord@...net.at>
To:     MJPEG-tools user list <mjpeg-users@...ts.sourceforge.net>,
        Arnd Bergmann <arnd@...db.de>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Christoph Hellwig <hch@...radead.org>,
        Hans Verkuil <hans.verkuil@...co.com>,
        Arvind Yadav <arvind.yadav.cs@...il.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Linux Media Mailing List <linux-media@...r.kernel.org>
Subject: Re: [Mjpeg-users] [PATCH] media: zoran: move to dma-mapping interface

Hallo

Christoph Hellwig wrote:
> On Wed, Apr 25, 2018 at 09:08:13AM +0200, Arnd Bergmann wrote:
>>> That probably also means it can use dma_mmap_coherent instead of the
>>> handcrafted remap_pfn_range loop and the PageReserved abuse.
>>
>> I'd rather not touch that code. How about adding a comment about
>> the fact that it should use dma_mmap_coherent()?
>
> Maybe the real question is if there is anyone that actually cares
> for this driver, or if we are better off just removing it?
>
> Same is true for various other virt_to_bus using drivers, e.g. the
> grotty atm drivers.

I would appreciate if somebody would removes the driver from the linux 
kernel. I suggested that some years ago 2014-06-23 (just scroll down):
https://sourceforge.net/p/mjpeg/mailman/mjpeg-users/?viewmonth=201406

You should also find that thread in the kernel-janitors@...r.kernel.org 
and linux-media@...r.kernel.org Mailinglist archive.

I know of one person that is still using this old type of card's but he 
uses a 2.6.x Kernel on a old machine, using old software releases.
https://sourceforge.net/p/mjpeg/mailman/mjpeg-users/?viewmonth=201709

That type of card were introduced about ~20 years ago. I think it is a 
good moment to say goodbye to that type of cards.

auf hoffentlich bald,

Berni the Chaos of Woodquarter

Email: shadowlord@...net.at
www: http://www.lysator.liu.se/~gz/bernhard