linux-kernel - [PATCH 4.16 081/279] net: phy: marvell: clear wol event before setting it

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Message-Id: <20180618080612.159657869@linuxfoundation.org>
Date:   Mon, 18 Jun 2018 10:11:06 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Jingju Hou <Jingju.Hou@...aptics.com>,
        Jisheng Zhang <Jisheng.Zhang@...aptics.com>,
        "David S. Miller" <davem@...emloft.net>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 4.16 081/279] net: phy: marvell: clear wol event before setting it

4.16-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Jingju Hou <Jingju.Hou@...aptics.com>

[ Upstream commit b6a930fa88083b41d26ddf1cab95cbd740936c22 ]

If WOL event happened once, the LED[2] interrupt pin will not be
cleared unless we read the CSISR register. If interrupts are in use,
the normal interrupt handling will clear the WOL event. Let's clear the
WOL event before enabling it if !phy_interrupt_is_valid().

Signed-off-by: Jingju Hou <Jingju.Hou@...aptics.com>
Signed-off-by: Jisheng Zhang <Jisheng.Zhang@...aptics.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/phy/marvell.c |    9 +++++++++
 1 file changed, 9 insertions(+)

--- a/drivers/net/phy/marvell.c
+++ b/drivers/net/phy/marvell.c
@@ -1377,6 +1377,15 @@ static int m88e1318_set_wol(struct phy_d
 		if (err < 0)
 			goto error;
 
+		/* If WOL event happened once, the LED[2] interrupt pin
+		 * will not be cleared unless we reading the interrupt status
+		 * register. If interrupts are in use, the normal interrupt
+		 * handling will clear the WOL event. Clear the WOL event
+		 * before enabling it if !phy_interrupt_is_valid()
+		 */
+		if (!phy_interrupt_is_valid(phydev))
+			phy_read(phydev, MII_M1011_IEVENT);
+
 		/* Enable the WOL interrupt */
 		err = __phy_modify(phydev, MII_88E1318S_PHY_CSIER, 0,
 				   MII_88E1318S_PHY_CSIER_WOL_EIE);