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

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Message-ID: <CAMuHMdUJifhi+CrrGc4oMGCESyypSAjaEg+crDH_XFVnXd10Qw@mail.gmail.com>
Date:   Fri, 13 Apr 2018 12:40:22 +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 12:09 PM, Vinod Koul <vinod.koul@...el.com> wrote:
> On Fri, Apr 13, 2018 at 10:39:48AM +0200, Geert Uytterhoeven wrote:
>> 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()")
>
> Yeah but it this case it is the last element. But yes it helps to avoid such
> mistakes in future..

It was the last element in 74x164, too. Unless someone changed that.

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