linux-kernel - Re: [PATCH 5/7] i2c: rcar: : use proper DMAENGINE API for termination

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Date:   Wed, 23 Jun 2021 16:02:19 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Wolfram Sang <wsa+renesas@...g-engineering.com>
Cc:     Linux MMC List <linux-mmc@...r.kernel.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        Linux I2C <linux-i2c@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 5/7] i2c: rcar: : use proper DMAENGINE API for termination

Hi Wolfram,

On Wed, Jun 23, 2021 at 12:01 PM Wolfram Sang
<wsa+renesas@...g-engineering.com> wrote:
> dmaengine_terminate_all() is deprecated in favor of explicitly saying if
> it should be sync or async. Here, we want dmaengine_terminate_sync()
> because there is no other synchronization code in the driver to handle
> an async case.
>
> Signed-off-by: Wolfram Sang <wsa+renesas@...g-engineering.com>

Thanks for your patch!

Is this safe? The driver is not using a threaded irq, and DMA termination
may be called from the interrupt handler.

Have you tried triggering DMA termination, with lockdep enabled?

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds