linux-kernel - Re: [PATCH 05/17] spi: dw: Discard static DW DMA slave structures

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Message-ID: <20200508194441.GB185537@smile.fi.intel.com>
Date:   Fri, 8 May 2020 22:44:41 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Serge Semin <Sergey.Semin@...kalelectronics.ru>
Cc:     Mark Brown <broonie@...nel.org>,
        Serge Semin <fancer.lancer@...il.com>,
        Georgy Vlasov <Georgy.Vlasov@...kalelectronics.ru>,
        Ramil Zaripov <Ramil.Zaripov@...kalelectronics.ru>,
        Alexey Malahov <Alexey.Malahov@...kalelectronics.ru>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Paul Burton <paulburton@...nel.org>,
        Ralf Baechle <ralf@...ux-mips.org>,
        Allison Randal <allison@...utok.net>,
        Gareth Williams <gareth.williams.jx@...esas.com>,
        Arnd Bergmann <arnd@...db.de>,
        Rob Herring <robh+dt@...nel.org>, linux-mips@...r.kernel.org,
        devicetree@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
        "wuxu.wu" <wuxu.wu@...wei.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        linux-spi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 05/17] spi: dw: Discard static DW DMA slave structures

On Fri, May 08, 2020 at 04:29:30PM +0300, Serge Semin wrote:
> Having them declared is redundant since each struct dw_dma_chan has
> the same structure embedded and the structure from the passed dma_chan
> private pointer will be copied there as a result of the next calls
> chain:
> dma_request_channel() -> find_candidate() -> dma_chan_get() ->
> device_alloc_chan_resources() = dwc_alloc_chan_resources() ->
> dw_dma_filter().
> So just remove the static dw_dma_chan structures and use a locally
> declared data instance with dst_id/src_id set to the same values as
> the static copies used to have.

I'm not against it, but you may leave if for the future (see spi/for-next).

-- 
With Best Regards,
Andy Shevchenko