linux-kernel - [PATCH AUTOSEL 4.14 19/21] r8152: Set macpassthru in reset

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Message-Id: <20191009170615.32750-19-sashal@kernel.org>
Date:   Wed,  9 Oct 2019 13:06:12 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Kai-Heng Feng <kai.heng.feng@...onical.com>,
        "David S . Miller" <davem@...emloft.net>,
        Sasha Levin <sashal@...nel.org>, linux-usb@...r.kernel.org,
        netdev@...r.kernel.org
Subject: [PATCH AUTOSEL 4.14 19/21] r8152: Set macpassthru in reset_resume callback

From: Kai-Heng Feng <kai.heng.feng@...onical.com>

[ Upstream commit a54cdeeb04fc719e4c7f19d6e28dba7ea86cee5b ]

r8152 may fail to establish network connection after resume from system
suspend.

If the USB port connects to r8152 lost its power during system suspend,
the MAC address was written before is lost. The reason is that The MAC
address doesn't get written again in its reset_resume callback.

So let's set MAC address again in reset_resume callback. Also remove
unnecessary lock as no other locking attempt will happen during
reset_resume.

Signed-off-by: Kai-Heng Feng <kai.heng.feng@...onical.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/usb/r8152.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/net/usb/r8152.c b/drivers/net/usb/r8152.c
index 455eec3c46942..c0964281ab983 100644
--- a/drivers/net/usb/r8152.c
+++ b/drivers/net/usb/r8152.c
@@ -4465,10 +4465,9 @@ static int rtl8152_reset_resume(struct usb_interface *intf)
 	struct r8152 *tp = usb_get_intfdata(intf);
 
 	clear_bit(SELECTIVE_SUSPEND, &tp->flags);
-	mutex_lock(&tp->control);
 	tp->rtl_ops.init(tp);
 	queue_delayed_work(system_long_wq, &tp->hw_phy_work, 0);
-	mutex_unlock(&tp->control);
+	set_ethernet_addr(tp);
 	return rtl8152_resume(intf);
 }
 
-- 
2.20.1