linux-kernel - Re: [PATCH] dmaengine: qcom_hidma: release the descriptor before the callback

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Message-ID: <20160819170208.GC9343@localhost>
Date:   Fri, 19 Aug 2016 22:32:08 +0530
From:   Vinod Koul <vinod.koul@...el.com>
To:     okaya@...eaurora.org
Cc:     Russell King - ARM Linux <linux@...linux.org.uk>,
        linux-arm-msm@...r.kernel.org, timur@...eaurora.org,
        linux-kernel@...r.kernel.org,
        Christopher Covington <cov@...eaurora.org>,
        dmaengine@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] dmaengine: qcom_hidma: release the descriptor before the
 callback

On Fri, Aug 19, 2016 at 07:13:43AM -0400, okaya@...eaurora.org wrote:
> On 2016-08-19 01:52, Vinod Koul wrote:
> >On Thu, Aug 18, 2016 at 11:48:52PM -0400, Sinan Kaya wrote:
> >>On 8/18/2016 11:42 PM, Vinod Koul wrote:
> >>> On Thu, Aug 18, 2016 at 11:26:28PM -0400, Sinan Kaya wrote:
> >>>> On 8/18/2016 10:48 PM, Vinod Koul wrote:
> >>>>>> Keep a size limited list with error cookies and flush them in terminate all?
> >>>>> I think so, terminate_all anyway cleans up the channel. Btw what is the
> >>>>> behaviour on error? Do you terminate or somthing else?
> >>>>>
> >>>>
> >>>> On error, I flush all outstanding transactions with an error code and I reset
> >>>> the channel. After the reset, the DMA channel is functional again. The client
> >>>> doesn't need to shutdown anything.
> >>>
> >>> You mean from the client context or driver?
> >>>
> >>
> >>The client doesn't need to call device_free_chan_resources and
> >>device_terminate_all
> >>to be specific. Client can certainly call these if it needs to
> >>but it is not
> >>required to recover the channel.
> >
> >You didn't answer my question!
> >
> >On error you said you flush, so who does that?
> 
> This is done by the driver in interrupt context when an error
> interrupt is received. All transactions are posted and hw is reset.

Hmmm, waht about the txn which are pending? DO you clear them..?

-- 
~Vinod