netdev - Re: [PATCH net-next] drivers: net: davinci

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Message-ID: <20180508124856.GA2888@lunn.ch>
Date:   Tue, 8 May 2018 14:48:56 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Sekhar Nori <nsekhar@...com>
Cc:     Grygorii Strashko <grygorii.strashko@...com>,
        "David S . Miller" <davem@...emloft.net>,
        linux-omap@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH net-next] drivers: net: davinci_mdio: prevent sprious
 timeout

On Tue, May 08, 2018 at 01:56:38PM +0530, Sekhar Nori wrote:
> A well timed kernel preemption in the time_after() loop
> in wait_for_idle() can result in a spurious timeout
> error to be returned.
> 
> Fix it by checking for status of hardware before returning
> timeout error.
> 
> Signed-off-by: Sekhar Nori <nsekhar@...com>

I've seen this with other drivers as well.

I suggest you make use of readx_poll_timeout(), or one of its
cousins. They get this right.

	 Andrew