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From: Kurt Kanzenbach <kurt.kanzenbach@linutronix.de>
To: Andrew Lunn <andrew@lunn.ch>
Cc: Anirudha Sarangi <anirudh@xilinx.com>,
	John Linn <John.Linn@xilinx.com>,
	"David S. Miller" <davem@davemloft.net>,
	Michal Simek <michal.simek@xilinx.com>,
	Radhey Shyam Pandey <radhey.shyam.pandey@xilinx.com>,
	YueHaibing <yuehaibing@huawei.com>,
	netdev@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH 0/2] net: xlinx: mdio: recheck condition after timeout
Date: Tue, 30 Oct 2018 14:47:04 +0100	[thread overview]
Message-ID: <20181030134704.l673d7pm5mwysx2o@linutronix.de> (raw)
In-Reply-To: <20181030120831.GC27873@lunn.ch>

Hi Andrew,

On Tue, Oct 30, 2018 at 01:08:31PM +0100, Andrew Lunn wrote:
> On Tue, Oct 30, 2018 at 10:31:37AM +0100, Kurt Kanzenbach wrote:
> > Hi,
> >
> > the Xilinx mdio wait functions may return false positives under certain
> > circumstances: If the functions get preempted between reading the corresponding
> > mdio register and checking for the timeout, they could falsely indicate a
> > timeout.
>
> Hi Kurt
>
> I wonder if it would be possible to add a readx_poll_timeout() which
> passes two parameters to op()?

actually I was thinking about using readx_poll_timeout(). But as you
already pointed out, it expects only one parameter for op(). I'm not
sure about adding a new readx_poll_timeout() macro.

>
> I keep seeing this basic problem in various drivers, and try to point
> people towards readx_poll_timeout(), but it is not the best of fit.
>
> Otherwise, could you add a axienet_ior_read_mcr(lp), and use
> readx_poll_timeout() as is?

I guess that would work.

I'll use readx_poll_timeout() for both wait functions and send a v2.

Thanks,
Kurt

      reply	other threads:[~2018-10-30 13:47 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-10-30  9:31 [PATCH 0/2] net: xlinx: mdio: recheck condition after timeout Kurt Kanzenbach
2018-10-30  9:31 ` [PATCH 1/2] net: axienet: recheck condition after timeout in mdio_wait() Kurt Kanzenbach
2018-10-30 18:25   ` David Miller
2018-10-31 13:06     ` Kurt Kanzenbach
2018-11-05  9:16     ` Sebastian Andrzej Siewior
2018-10-30  9:31 ` [PATCH 2/2] net: xilinx_emaclite: " Kurt Kanzenbach
2018-10-30 12:10   ` Andrew Lunn
2018-10-30 12:58     ` Radhey Shyam Pandey
2018-10-30 18:25   ` David Miller
2018-10-30 12:08 ` [PATCH 0/2] net: xlinx: mdio: recheck condition after timeout Andrew Lunn
2018-10-30 13:47   ` Kurt Kanzenbach [this message]

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