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From: Pavel Machek <pavel@ucw.cz>
To: Lino Sanfilippo <LinoSanfilippo@gmx.de>
Cc: Francois Romieu <romieu@fr.zoreil.com>,
	bh74.an@samsung.com, ks.giri@samsung.com,
	vipul.pandya@samsung.com, peppe.cavallaro@st.com,
	alexandre.torgue@st.com, davem@davemloft.net,
	linux-kernel@vger.kernel.org, netdev@vger.kernel.org
Subject: Re: [PATCH 1/2] net: ethernet: sxgbe: remove private tx queue lock
Date: Sun, 18 Dec 2016 21:16:35 +0100	[thread overview]
Message-ID: <20161218201635.GB7886@amd> (raw)
In-Reply-To: <a2cbcfcd-f377-565c-a21c-3daa3abce519@gmx.de>

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Hi!

> > For the same reason it's broken if it races with the transmit path: it
> > can release driver resources while the transmit path uses these.
> > 
> > Btw the points below may not matter/hurt much for a proof a concept
> > but they would need to be addressed as well:
> > 1) unchecked (and avoidable) extra error paths due to stmmac_release()
> > 2) racy cancel_work_sync. Low probability as it is, an irq + error could
> >    take place right after cancel_work_sync
> 
> It was indeed only meant as a proof of concept. Nevertheless the race is not 
> good, since one can run into it when faking the tx error for testings purposes.
> So below is a slightly improved version of the restart handling.
> Its not meant as a final version either. But maybe we can use it as a starting
> point.

Certainly works better than version we currently have in tree. I'm
running it in a loop, and it survived 10 minutes of testing so
far. (Previous version killed the hardware at first iteration.)

> Again the patch is only compile tested.

Tested-by: Pavel Machek <pavel@denx.de>

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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  parent reply	other threads:[~2016-12-18 20:16 UTC|newest]

Thread overview: 36+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-12-07 20:05 Remove private locks to avoid possible deadlock Lino Sanfilippo
2016-12-07 20:05 ` [PATCH 1/2] net: ethernet: sxgbe: remove private tx queue lock Lino Sanfilippo
2016-12-07 23:15   ` Francois Romieu
2016-12-08 20:32     ` Lino Sanfilippo
2016-12-08 21:54       ` Pavel Machek
2016-12-08 22:12         ` Lino Sanfilippo
2016-12-08 22:18           ` Pavel Machek
2016-12-08 22:45             ` Lino Sanfilippo
2016-12-08 23:19       ` Francois Romieu
2016-12-09 11:21         ` Pavel Machek
2016-12-10  2:25           ` Lino Sanfilippo
2016-12-11 20:11             ` Pavel Machek
2016-12-15 19:27               ` Lino Sanfilippo
2016-12-15 21:03                 ` Pavel Machek
2016-12-15 21:32                   ` Lino Sanfilippo
2016-12-15 22:33                     ` Lino Sanfilippo
2016-12-17 17:31                       ` Pavel Machek
2016-12-18  0:15                         ` Francois Romieu
2016-12-18 16:15                           ` Lino Sanfilippo
2016-12-18 17:23                             ` Pavel Machek
2016-12-18 18:30                             ` Pavel Machek
2016-12-19 22:49                               ` Lino Sanfilippo
2016-12-18 20:16                             ` Pavel Machek [this message]
2016-12-19 10:02                           ` Pavel Machek
2016-12-20  0:05                             ` Francois Romieu
2016-12-07 20:05 ` [PATCH 2/2] net: ethernet: stmmac: " Lino Sanfilippo
2016-12-07 20:55   ` Pavel Machek
2016-12-07 20:59   ` Pavel Machek
2016-12-07 21:37   ` Pavel Machek
2016-12-07 21:43     ` Lino Sanfilippo
2016-12-07 22:34       ` Lino Sanfilippo
2016-12-07 23:21         ` Pavel Machek
2016-12-07 23:41     ` David Miller
2016-12-08 14:08       ` Pavel Machek
2016-12-08 15:26         ` David Miller
2016-12-08 15:46           ` Pavel Machek

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