linux-kernel - [PATCH v2 2/2] net: phy: Don't miss phy_suspend() on PHY

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Message-ID: <1490180524-28675-3-git-send-email-rogerq@ti.com>
Date:   Wed, 22 Mar 2017 13:02:04 +0200
From:   Roger Quadros <rogerq@...com>
To:     <f.fainelli@...il.com>
CC:     <andrew@...n.ch>, <davem@...emloft.net>, <kyle.roeschley@...com>,
        <nsekhar@...com>, <netdev@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, Roger Quadros <rogerq@...com>,
        "stable # v4 . 9+" <stable@...r.kernel.org>
Subject: [PATCH v2 2/2] net: phy: Don't miss phy_suspend() on PHY_HALTED for PHYs with interrupts

phy_suspend() doesn't get called as part of phy_stop() for PHYs
using interrupts because the phy state machine is never triggered
after a phy_stop().

Explicitly trigger the PHY state machine in phy_stop() so that it can
see the new PHY state (HALTED) and suspend the PHY.

As most PHYLIB consumers will call phy_stop() with rtnl_lock() held
from ndo_close() so we use don't wait for workqueue cancellation in
phy_trigger_machine() by passing false for the 'sync' argument.

Fixes: 3c293f4e08b5 ("net: phy: Trigger state machine on state change and not polling.")
Cc: stable <stable@...r.kernel.org> # v4.9+
Signed-off-by: Roger Quadros <rogerq@...com>
---
 drivers/net/phy/phy.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/phy/phy.c b/drivers/net/phy/phy.c
index 49dedf8..ab14e7b 100644
--- a/drivers/net/phy/phy.c
+++ b/drivers/net/phy/phy.c
@@ -907,6 +907,7 @@ void phy_stop(struct phy_device *phydev)
 	 * of rtnl_lock(), but PHY_HALTED shall guarantee phy_change()
 	 * will not reenable interrupts.
 	 */
+	phy_trigger_machine(phydev, false);
 }
 EXPORT_SYMBOL(phy_stop);
 
-- 
2.7.4