From: Miquel Raynal <miquel.raynal@bootlin.com>
To: Vivien Didelot <vivien.didelot@gmail.com>
Cc: Andrew Lunn <andrew@lunn.ch>,
Florian Fainelli <f.fainelli@gmail.com>,
"David S. Miller" <davem@davemloft.net>,
netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
Thomas Petazzoni <thomas.petazzoni@bootlin.com>,
Gregory Clement <gregory.clement@bootlin.com>,
Antoine Tenart <antoine.tenart@bootlin.com>,
Maxime Chevallier <maxime.chevallier@bootlin.com>,
Nadav Haklai <nadavh@marvell.com>
Subject: Re: [PATCH net-next v2 1/2] net: dsa: mv88e6xxx: Save switch rules
Date: Fri, 1 Feb 2019 12:01:19 +0100 [thread overview]
Message-ID: <20190201120119.752e7ed6@xps13> (raw)
In-Reply-To: <20190130194608.GB28098@t480s.localdomain>
Hi Vivien,
Vivien Didelot <vivien.didelot@gmail.com> wrote on Wed, 30 Jan 2019
19:46:08 -0500:
> Hi Miquèl,
>
> On Wed, 30 Jan 2019 10:46:06 +0100, Miquel Raynal <miquel.raynal@bootlin.com> wrote:
>
> > > > > Today, there is no S2RAM support for switches. First, I proposed to add
> > > > > suspend/resume callbacks to the mv88e6xxx driver - just enough to avoid
> > > > > crashing the kernel.
> > > >
> > > > Then i would suggest the mv88e6xxx refuses the suspend. Actually that
> > > > probably is the first correct step. We don't have suspend support, so
> > > > stop the suspend happening, so preventing the kernel crash.
>
> Actually can you show me the crash that is happening?
Sure, here it is: http://code.bulix.org/swwb11-569137
Actually it is a silent crash but the platform never resumes. I am
pretty sure this is due to the kthread_queue_delayed_work() loop which
might access registers before it is allowed to do so. In my proposal I
just canceled it at suspend and restarted it at resume.
Next week I will send a patch to refuse the suspend as you both
suggested and if people want to suspend, they will have to remove the
switch support.
Thanks,
Miquèl
next prev parent reply other threads:[~2019-02-01 11:01 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-25 9:55 [PATCH net-next v2 0/2] mv88e6xxx DSA suspend to RAM support Miquel Raynal
2019-01-25 9:55 ` [PATCH net-next v2 1/2] net: dsa: mv88e6xxx: Save switch rules Miquel Raynal
2019-01-25 18:37 ` Florian Fainelli
2019-01-28 14:24 ` Miquel Raynal
2019-01-28 14:44 ` Andrew Lunn
2019-01-28 15:57 ` Miquel Raynal
2019-01-28 17:42 ` Andrew Lunn
2019-01-29 9:01 ` Miquel Raynal
2019-01-29 14:51 ` Andrew Lunn
2019-01-29 15:46 ` Vivien Didelot
2019-01-30 9:46 ` Miquel Raynal
2019-01-30 14:54 ` Andrew Lunn
2019-01-31 0:46 ` Vivien Didelot
2019-02-01 11:01 ` Miquel Raynal [this message]
2019-02-01 14:08 ` Andrew Lunn
2019-02-01 14:43 ` Miquel Raynal
2019-01-25 9:55 ` [PATCH net-next v2 2/2] net: dsa: mv88e6xxx: Add suspend to RAM support Miquel Raynal
2019-01-27 21:22 ` [PATCH net-next v2 0/2] mv88e6xxx DSA " David Miller
2019-01-27 21:46 ` Andrew Lunn
2019-01-28 3:44 ` David Miller
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