linux-kernel - Re: [PATCH v4 2/2] dma: Add Xilinx zynqmp dma engine driver support

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Date:	Sun, 23 Aug 2015 20:24:16 +0530
From:	punnaiah choudary kalluri <punnaia@...inx.com>
To:	Vinod Koul <vinod.koul@...el.com>
Cc:	Punnaiah Choudary Kalluri <punnaiah.choudary.kalluri@...inx.com>,
	"robh+dt@...nel.org" <robh+dt@...nel.org>,
	"pawel.moll@....com" <pawel.moll@....com>,
	"mark.rutland@....com" <mark.rutland@....com>,
	"ijc+devicetree@...lion.org.uk" <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	"michal.simek@...inx.com" <michal.simek@...inx.com>,
	dan.j.williams@...el.com, dmaengine@...r.kernel.org,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Punnaiah Choudary <kpc528@...il.com>
Subject: Re: [PATCH v4 2/2] dma: Add Xilinx zynqmp dma engine driver support

On Sun, Aug 23, 2015 at 7:38 PM, Vinod Koul <vinod.koul@...el.com> wrote:
> On Thu, Aug 20, 2015 at 12:01:27PM +0530, punnaiah choudary kalluri wrote:
>> On Thu, Aug 20, 2015 at 11:43 AM, Vinod Koul <vinod.koul@...el.com> wrote:
>> > On Thu, Aug 06, 2015 at 08:49:33AM +0530, Punnaiah Choudary Kalluri wrote:
>> >
>> >> +     list_for_each_entry_safe(desc, next, &chan->done_list, node) {
>> >> +             dma_async_tx_callback callback;
>> >> +             void *callback_param;
>> >> +
>> >> +             list_del(&desc->node);
>> >> +
>> >> +             callback = desc->async_tx.callback;
>> >> +             callback_param = desc->async_tx.callback_param;
>> >> +             if (callback) {
>> >> +                     if (in_interrupt())
>> >> +                             spin_unlock_bh(&chan->lock);
>> >> +                     else
>> >> +                             spin_unlock(&chan->lock);
>> >
>> > This looks bad!
>> > Why would callback be called from different context. It should only be
>> > invoked from your tasklet
>>
>> During the terminate call, driver need to clean up the existing BDs so that time
>> this function will be called from the thread or process context in
>> addition to the
>> tasklet context.
>>
>> DO you have any suggestion here ?
>
> Yes you need to terminate but you don't need to invoke user for terminate
> flow. It is not expected.
> Terminate flow expect youu to clean the channels

Ok. Thanks. I will fix this and send v5 soon.

Regards,
Punnaiah
>
> --
> ~Vinod
> --
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