linux-kernel - Re: [v2 PATCH 1/1] tg3: fix meaningless hw_stats reading after tg3_halt memset 0 hw

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Message-ID: <CACKFLinOzi+F9j+gbBHjkGdMdXTqpfMRLUwqx=zUpVg76zGxNA@mail.gmail.com>
Date:   Wed, 2 May 2018 10:32:52 -0700
From:   Michael Chan <michael.chan@...adcom.com>
To:     Zumeng Chen <zumeng.chen@...il.com>
Cc:     Netdev <netdev@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        Siva Reddy Kallam <siva.kallam@...adcom.com>,
        "prashant.sreedharan@...adcom.com" <prashant@...adcom.com>,
        David Miller <davem@...emloft.net>,
        Zumeng Chen <zumeng.chen@...driver.com>
Subject: Re: [v2 PATCH 1/1] tg3: fix meaningless hw_stats reading after
 tg3_halt memset 0 hw_stats

On Wed, May 2, 2018 at 3:27 AM, Zumeng Chen <zumeng.chen@...il.com> wrote:
> On 2018年05月02日 13:12, Michael Chan wrote:
>>
>> On Tue, May 1, 2018 at 5:42 PM, Zumeng Chen <zumeng.chen@...il.com> wrote:
>>
>>> diff --git a/drivers/net/ethernet/broadcom/tg3.h
>>> b/drivers/net/ethernet/broadcom/tg3.h
>>> index 3b5e98e..c61d83c 100644
>>> --- a/drivers/net/ethernet/broadcom/tg3.h
>>> +++ b/drivers/net/ethernet/broadcom/tg3.h
>>> @@ -3102,6 +3102,7 @@ enum TG3_FLAGS {
>>>          TG3_FLAG_ROBOSWITCH,
>>>          TG3_FLAG_ONE_DMA_AT_ONCE,
>>>          TG3_FLAG_RGMII_MODE,
>>> +       TG3_FLAG_HALT,
>>
>> I think you should be able to use the existing INIT_COMPLETE flag
>
>
> No,  it will bring the uncertain factors into the existed complicate logic
> of INIT_COMPLETE.
> And I think it's very simple logic here to fix the meaningless hw_stats
> reading and the problem
> of commit f5992b72. I even suspect if you have read INIT_COMPLETE related
> codes carefully.
>

We should use an existing flag whenever appropriate, instead of adding
yet another flag to do similar things. I've looked at the code briefly
and believe that INIT_COMPLETE will work.  If you think it won't work,
please be specific and point out why it won't work.  Thanks.