linux-kernel - Re: [RESEND net-next 1/2] net: hns3: add support for PTP

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Message-ID: <20210605155143.GA10328@localhost>
Date:   Sat, 5 Jun 2021 08:51:43 -0700
From:   Richard Cochran <richardcochran@...il.com>
To:     "huangguangbin (A)" <huangguangbin2@...wei.com>
Cc:     davem@...emloft.net, kuba@...nel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, salil.mehta@...wei.com,
        lipeng321@...wei.com, tanhuazhong@...wei.com
Subject: Re: [RESEND net-next 1/2] net: hns3: add support for PTP

On Sat, Jun 05, 2021 at 05:54:45PM +0800, huangguangbin (A) wrote:
> > This won't work.  After all, the ISR thread might already be running.
> > Use a proper spinlock instead.
> > 
> Thanks for review. Using spinlock in irq_handler looks heavy, what about
> adding a new flag HCLGE_STATE_PTP_CLEANING_TX_HWTS for hclge_ptp_clean_tx_hwts()?
> Function hclge_ptp_clean_tx_hwts() test and set this flag at the beginning
> and clean it in the end. Do you think it is Ok?

No, I don't.  Use a proper lock.  Don't make vague arguments about how
it "looks heavy".

Thanks,
Richard