netdev - Re: [PATCH] net/ethernet/freescale: rework quiesce/activate for ucc

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Message-Id: <20200522.155054.352367636201826991.davem@davemloft.net>
Date:   Fri, 22 May 2020 15:50:54 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     valentin@...gchamp.me
Cc:     linuxppc-dev@...ts.ozlabs.org, netdev@...r.kernel.org,
        kuba@...nel.org, hkallweit1@...il.com, matteo.ghidoni@...abb.com
Subject: Re: [PATCH] net/ethernet/freescale: rework quiesce/activate for
 ucc_geth

From: Valentin Longchamp <valentin@...gchamp.me>
Date: Wed, 20 May 2020 17:53:50 +0200

> ugeth_quiesce/activate are used to halt the controller when there is a
> link change that requires to reconfigure the mac.
> 
> The previous implementation called netif_device_detach(). This however
> causes the initial activation of the netdevice to fail precisely because
> it's detached. For details, see [1].
> 
> A possible workaround was the revert of commit
> net: linkwatch: add check for netdevice being present to linkwatch_do_dev
> However, the check introduced in the above commit is correct and shall be
> kept.
> 
> The netif_device_detach() is thus replaced with
> netif_tx_stop_all_queues() that prevents any tranmission. This allows to
> perform mac config change required by the link change, without detaching
> the corresponding netdevice and thus not preventing its initial
> activation.
> 
> [1] https://lists.openwall.net/netdev/2020/01/08/201
> 
> Signed-off-by: Valentin Longchamp <valentin@...gchamp.me>
> Acked-by: Matteo Ghidoni <matteo.ghidoni@...abb.com>

Applied, thanks.