netdev - Re: [PATCHv2] smsc911x: power-up phydev before doing a software reset.

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Message-Id: <20141113.150956.1894676742782542194.davem@davemloft.net>
Date:	Thu, 13 Nov 2014 15:09:56 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	eballetbo@...ebcn.com
Cc:	netdev@...r.kernel.org, steve.glendinning@...well.net,
	javier@...hile0.org, ebutera@...il.com
Subject: Re: [PATCHv2] smsc911x: power-up phydev before doing a software
 reset.

From: Enric Balletbo i Serra <eballetbo@...ebcn.com>
Date: Thu, 13 Nov 2014 09:14:34 +0100

> With commit be9dad1f9f26604fb ("net: phy: suspend phydev when going
> to HALTED"), the PHY device will be put in a low-power mode using
> BMCR_PDOWN if the the interface is set down. The smsc911x driver does
> a software_reset opening the device driver (ndo_open). In such case,
> the PHY must be powered-up before access to any register and before
> calling the software_reset function. Otherwise, as the PHY is powered
> down the software reset fails and the interface can not be enabled
> again.
> 
> This patch fixes this scenario that is easy to reproduce setting down
> the network interface and setting up again.
> 
>     $ ifconfig eth0 down
>     $ ifconfig eth0 up
>     ifconfig: SIOCSIFFLAGS: Input/output error
> 
> Signed-off-by: Enric Balletbo i Serra <eballetbo@...ebcn.com>

Applied and queued up for -stable, thanks.
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