linux-kernel - Re: [PATCH v3 1/3] dmaengine: imx-sdma: fix buffer ownership

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Date:   Thu, 19 Sep 2019 13:42:33 +0200
From:   Philipp Puschmann <philipp.puschmann@...ix.com>
To:     Fabio Estevam <festevam@...il.com>
Cc:     linux-kernel <linux-kernel@...r.kernel.org>,
        Robin Gong <yibin.gong@....com>,
        Fugang Duan <fugang.duan@....com>,
        Lucas Stach <l.stach@...gutronix.de>,
        Dan Williams <dan.j.williams@...el.com>,
        Vinod <vkoul@...nel.org>, Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Sascha Hauer <kernel@...gutronix.de>,
        NXP Linux Team <linux-imx@....com>, dmaengine@...r.kernel.or,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v3 1/3] dmaengine: imx-sdma: fix buffer ownership

Hi Fabio,


Am 19.09.19 um 13:37 schrieb Fabio Estevam:
> Hi Philipp,
> 
> On Thu, Sep 19, 2019 at 7:45 AM Philipp Puschmann
> <philipp.puschmann@...ix.com> wrote:
>>
>> BD_DONE flag marks ownership of the buffer. When 1 SDMA owns the
>> buffer, when 0 ARM owns it. When processing the buffers in
>> sdma_update_channel_loop the ownership of the currently processed
>> buffer was set to SDMA again before running the callback function of
>> the buffer and while the sdma script may be running in parallel. So
>> there was the possibility to get the buffer overwritten by SDMA before
>> it has been processed by kernel leading to kind of random errors in the
>> upper layers, e.g. bluetooth.
>>
>> Fixes: broken since start
> 
> The Fixes tag requires a commit ID like this:
> 
> Fixes: 1ec1e82f2510 ("dmaengine: Add Freescale i.MX SDMA support")
> 
> Same applies to the other patch.
> 
oh okay, thanks. I will fix this with v4.

Regards,
Philipp