From: Mason <slash.tmp@free.fr>
To: Florian Fainelli <f.fainelli@gmail.com>,
David Daney <ddaney.cavm@gmail.com>
Cc: Marc Gonzalez <marc_gonzalez@sigmadesigns.com>,
netdev <netdev@vger.kernel.org>,
Geert Uytterhoeven <geert+renesas@glider.be>,
David Miller <davem@davemloft.net>, Andrew Lunn <andrew@lunn.ch>,
Mans Rullgard <mans@mansr.com>
Subject: Re: [PATCH net] Revert "net: phy: Correctly process PHY_HALTED in phy_stop_machine()"
Date: Thu, 31 Aug 2017 19:49:47 +0200 [thread overview]
Message-ID: <d6a6b552-95a7-8353-54c8-fa804f9366a1@free.fr> (raw)
In-Reply-To: <931bf454-81ff-94dc-82e6-bc2b889bd43a@gmail.com>
On 31/08/2017 18:57, Florian Fainelli wrote:
> And the race is between phy_detach() setting phydev->attached_dev = NULL
> and phy_state_machine() running in PHY_HALTED state and calling
> netif_carrier_off().
I must be missing something.
(Since a thread cannot race against itself.)
phy_disconnect calls phy_stop_machine which
1) stops the work queue from running in a separate thread
2) calls phy_state_machine *synchronously*
which runs the PHY_HALTED case with everything well-defined
end of phy_stop_machine
phy_disconnect only then calls phy_detach()
which makes future calls of phy_state_machine perilous.
This all happens in the same thread, so I'm not yet
seeing where the race happens?
Regards.
next prev parent reply other threads:[~2017-08-31 17:49 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-08-31 0:49 [PATCH net] Revert "net: phy: Correctly process PHY_HALTED in phy_stop_machine()" Florian Fainelli
2017-08-31 1:47 ` David Miller
2017-08-31 12:29 ` Marc Gonzalez
2017-08-31 14:21 ` Marc Gonzalez
2017-08-31 16:36 ` David Daney
2017-08-31 16:57 ` Florian Fainelli
2017-08-31 17:49 ` Mason [this message]
2017-08-31 17:53 ` Florian Fainelli
2017-08-31 18:12 ` Mason
2017-08-31 18:29 ` Florian Fainelli
2017-09-06 14:33 ` Mason
2017-09-06 17:53 ` David Daney
2017-09-06 18:00 ` David Daney
2017-09-06 18:59 ` Florian Fainelli
2017-09-06 20:49 ` David Daney
2017-09-06 22:51 ` David Daney
2017-09-06 23:14 ` Florian Fainelli
2017-09-07 0:10 ` David Daney
2017-09-07 1:41 ` Florian Fainelli
2017-09-06 19:14 ` Mason
2017-08-31 17:35 ` Mason
2017-08-31 17:03 ` Florian Fainelli
2017-08-31 19:09 ` Mason
2017-08-31 19:18 ` Florian Fainelli
2017-09-06 14:55 ` Mason
2017-09-06 19:28 ` Florian Fainelli
2017-09-06 15:51 ` Mason
2017-09-06 19:42 ` Florian Fainelli
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