netdev - Re: [net-next.git 4/9] stmmac: add the support for PTP hw clock driver

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Message-ID: <CAJ3bTp76BX-nbk5E_QVyx--EPAWbf3JtORVTbwjcd0skndzbKg@mail.gmail.com>
Date:	Tue, 12 Mar 2013 10:13:17 +0530
From:	Rayagond K <rayagond@...avyalabs.com>
To:	Richard Cochran <richardcochran@...il.com>
Cc:	Giuseppe CAVALLARO <peppe.cavallaro@...com>,
	netdev@...r.kernel.org, bh74.an@...sung.com
Subject: Re: [net-next.git 4/9] stmmac: add the support for PTP hw clock driver

On Tue, Mar 12, 2013 at 12:25 AM, Richard Cochran
<richardcochran@...il.com> wrote:
> On Sun, Mar 10, 2013 at 08:37:24PM +0530, Rayagond K wrote:
>> On Sun, Mar 10, 2013 at 5:40 PM, Richard Cochran <richardcochran@...il.com>wrote:
>
>> > Don't you need locking here to protect against concurrent callers of
>> > config_addend?
>> >
>>
>> Yes we need locking here too, will add it.
>>
>> But I can see no locking in this function in other two driver'e
>> ppt_ixp46x.c and gianfar_ptp.c. So I just followed these two driver.
>
> Those two drivers don't need locking, because setting the addend
> register is a single 32 bit write operation in both cases.
>
> In your driver, setting the addend involves a sequence of writes and
> reads, in addition to polling a status bit, so you do need to
> serialize access to those registers.

Okay, will take lock in our driver. Thank you.

>
> Thanks,
> Richard
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