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

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Message-ID: <20161209112142.GA22710@amd>
Date:   Fri, 9 Dec 2016 12:21:42 +0100
From:   Pavel Machek <pavel@....cz>
To:     Francois Romieu <romieu@...zoreil.com>
Cc:     Lino Sanfilippo <LinoSanfilippo@....de>, 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 Fri 2016-12-09 00:19:43, Francois Romieu wrote:
> Lino Sanfilippo <LinoSanfilippo@....de> :
> [...]
> > OTOH Pavel said that he actually could produce a deadlock. Now I wonder if
> > this is caused by that locking scheme (in a way I have not figured out yet)
> > or if it is a different issue.
> 
> stmmac_tx_err races with stmmac_xmit.

Umm, yes, that looks real.

And that means that removing tx_lock will not be completely trivial
:-(. Lino, any ideas there?

netif_tx_lock_irqsave() would help, but afaict that one does not
exist.

Plus, does someone know how to trigger the status == tx_hard_error? I
tried powering down the switch, but that did not do it.

Thanks,								Pavel

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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