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

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Date:   Thu, 15 Dec 2016 23:33:22 +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 22:32, Lino Sanfilippo wrote:

> 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
> 

And this is the "sledgehammer" approach: Do a complete shutdown and restart
of the hardware in case of tx error (against net-next and only compile tested).


View attachment "0001-Sledgehammer.patch" of type "text/x-patch" (4141 bytes)