netdev - Re: [PATCH 1/2] net: ethernet: sxgbe: remove private tx queue lock

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Date:   Thu, 15 Dec 2016 22:32:59 +0100
From:   Lino Sanfilippo <LinoSanfilippo@....de>
To:     Pavel Machek <pavel@....cz>
Cc:     Francois Romieu <romieu@...zoreil.com>, bh74.an@...sung.com,
        ks.giri@...sung.com, vipul.pandya@...sung.com,
        peppe.cavallaro@...com, alexandre.torgue@...com,
        davem@...emloft.net, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org
Subject: Re: [PATCH 1/2] net: ethernet: sxgbe: remove private tx queue lock

On 15.12.2016 22:03, Pavel Machek wrote:

> 
> I actually did experiment with adding locking there, too, and no, no
> luck. It seems stmmac_tx_err() is more broken than just locking.
> 

Ah ok. Then maybe priv->hw->dma->stop_tx() does not do the job correctly (stop the
tx path properly) and the HW is still active on the tx path while the tx buffers are
freed. OTOH stmmac_release() also stops the phy before the tx (and rx) paths are stopped.
Did you try to stop the phy fist in stmmac_tx_err_work(), too?

Regards,
Lino