Re: [PATCH v5] net: ethernet: add driver for Aurora VLSI NB8800 Ethernet controller

From	Andy Shevchenko <andy.shevchenko@gmail.com>
Newsgroups	linux.kernel
Subject	Re: [PATCH v5] net: ethernet: add driver for Aurora VLSI NB8800 Ethernet controller
Date	2015-11-10 23:50 +0100
Message-ID	<qtpTH-2Jl-13@gated-at.bofh.it> (permalink)
References	<qtjOi-7kQ-23@gated-at.bofh.it> <qtph1-2up-21@gated-at.bofh.it> <qtpK2-2FJ-19@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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On Wed, Nov 11, 2015 at 12:34 AM, Måns Rullgård <mans@mansr.com> wrote:
> Andy Shevchenko <andy.shevchenko@gmail.com> writes:
>
>>> +static inline void nb8800_maskb(struct nb8800_priv *priv, int reg,
>>> +                               u32 mask, u32 val)
>>> +{
>>> +       u32 old = nb8800_readb(priv, reg);
>>> +       u32 new = (old & ~mask) | val;
>>
>> Shoudn't be "… | (val & mask);" ?
>
> No, it's meant to replace the bits in mask with the corresponding bits
> from val.

But you unconditionally use entire val value which might bring bits
outside of mask.

>> Block comments usually
>> /*
>>  * text
>>  */
>
> Documentation/CodingStyle says net/ and drivers/net/ are special, though
> currently a mix of styles can be found.  Personally, I don't
> particularly care.

OK.

>>> +       nb8800_writel(priv, NB8800_TX_DESC_ADDR, txb->dma_desc);
>>> +       wmb();          /* ensure desc addr is written before starting DMA */
>>
>> Hm… Have I missed corresponding rmb() ? If it's about MMIO, perhaps mmiowb() ?
>
> Possibly.

Standalone wmb() doesn't make sense.

-- 
With Best Regards,
Andy Shevchenko
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Thread

Re: [PATCH v5] net: ethernet: add driver for Aurora VLSI NB8800 Ethernet controller Måns Rullgård <mans@mansr.com> - 2015-11-10 23:40 +0100
  Re: [PATCH v5] net: ethernet: add driver for Aurora VLSI NB8800  Ethernet controller Andy Shevchenko <andy.shevchenko@gmail.com> - 2015-11-10 23:50 +0100
    Re: [PATCH v5] net: ethernet: add driver for Aurora VLSI NB8800 Ethernet controller Måns Rullgård <mans@mansr.com> - 2015-11-11 00:10 +0100
      Re: [PATCH v5] net: ethernet: add driver for Aurora VLSI NB8800  Ethernet controller Andy Shevchenko <andy.shevchenko@gmail.com> - 2015-11-11 01:40 +0100
        Re: [PATCH v5] net: ethernet: add driver for Aurora VLSI NB8800 Ethernet controller Måns Rullgård <mans@mansr.com> - 2015-11-11 01:50 +0100

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