linux-kernel - Re: [PATCH v2 2/2] dmaengine: stm32-mdma: Fix incomplete Hw descriptors allocator

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Message-ID: <CAMuHMdWNyvveQ73SDrVy=EwkkO6Gd_4hmOkdstpcgzOL44a_mA@mail.gmail.com>
Date:   Fri, 13 Apr 2018 10:39:48 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Vinod Koul <vinod.koul@...el.com>
Cc:     Pierre-Yves MORDRET <pierre-yves.mordret@...com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        dmaengine@...r.kernel.org,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        "M'boumba Cedric Madianga" <cedric.madianga@...il.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v2 2/2] dmaengine: stm32-mdma: Fix incomplete Hw
 descriptors allocator

Hi Vinod,

On Fri, Apr 13, 2018 at 6:02 AM, Vinod Koul <vinod.koul@...el.com> wrote:
> On Wed, Apr 11, 2018 at 04:44:39PM +0200, Pierre-Yves MORDRET wrote:
>
>>  struct stm32_mdma_desc {
>>       struct virt_dma_desc vdesc;
>>       u32 ccr;
>> -     struct stm32_mdma_hwdesc *hwdesc;
>> -     dma_addr_t hwdesc_phys;
>>       bool cyclic;
>>       u32 count;
>> +     struct stm32_mdma_desc_node node[];
>
> some ppl use node[0] for this but i think either is fine..

node[] is the correct one, node[0] may hide future bugs, cfr. commit
a158531f3c92467d ("gpio: 74x164: Fix crash during .remove()")

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