linux-kernel - Re: [PATCH 07/10] dmaengine: amba-pl08x: Use vchan_terminate_vdesc() instead of desc

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Date:   Wed, 15 Nov 2017 08:48:50 +0100
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Peter Ujfalusi <peter.ujfalusi@...com>
Cc:     Vinod Koul <vinod.koul@...el.com>,
        linux-arm-kernel@...ts.infradead.org, dmaengine@...r.kernel.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Lars-Peter Clausen <lars@...afoo.de>
Subject: Re: [PATCH 07/10] dmaengine: amba-pl08x: Use vchan_terminate_vdesc()
 instead of desc_free

On Tue, Nov 14, 2017 at 3:32 PM, Peter Ujfalusi <peter.ujfalusi@...com> wrote:

> To avoid race with vchan_complete, use the race free way to terminate
> running transfer.
>
> Implement the device_synchronize callback to make sure that the terminated
> descriptor is freed.
>
> CC: Linus Walleij <linus.walleij@...aro.org>
> Signed-off-by: Peter Ujfalusi <peter.ujfalusi@...com>

I had to read patch 1 before I understood how the descriptor
gets free:ed now, but now I see it :)
Reviewed-by: Linus Walleij <linus.walleij@...aro.org>

(Good work with hunting down these corner cases, I'm
very happy you're doing this!)

Yours,
Linus Walleij