linux-kernel - [PATCH 3.18 090/120] r8169: Clear RTL_FLAG_TASK_*_PENDING when clearing RTL_FLAG_TASK

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Message-Id: <20181011152553.531483562@linuxfoundation.org>
Date:   Thu, 11 Oct 2018 17:34:31 +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, Heiner Kallweit <hkallweit1@...il.com>,
        Kai-Heng Feng <kai.heng.feng@...onical.com>,
        "David S. Miller" <davem@...emloft.net>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 3.18 090/120] r8169: Clear RTL_FLAG_TASK_*_PENDING when clearing RTL_FLAG_TASK_ENABLED

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

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

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

[ Upstream commit 6ad569019999300afd8e614d296fdc356550b77f ]

After system suspend, sometimes the r8169 doesn't work when ethernet
cable gets pluggued.

This issue happens because rtl_reset_work() doesn't get called from
rtl8169_runtime_resume(), after system suspend.

In rtl_task(), RTL_FLAG_TASK_* only gets cleared if this condition is
met:
if (!netif_running(dev) ||
    !test_bit(RTL_FLAG_TASK_ENABLED, tp->wk.flags))
    ...

If RTL_FLAG_TASK_ENABLED was cleared during system suspend while
RTL_FLAG_TASK_RESET_PENDING was set, the next rtl_schedule_task() won't
schedule task as the flag is still there.

So in addition to clearing RTL_FLAG_TASK_ENABLED, also clears other
flags.

Cc: Heiner Kallweit <hkallweit1@...il.com>
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 <alexander.levin@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/ethernet/realtek/r8169.c |    9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

--- a/drivers/net/ethernet/realtek/r8169.c
+++ b/drivers/net/ethernet/realtek/r8169.c
@@ -749,7 +749,7 @@ struct rtl8169_counters {
 };
 
 enum rtl_flag {
-	RTL_FLAG_TASK_ENABLED,
+	RTL_FLAG_TASK_ENABLED = 0,
 	RTL_FLAG_TASK_SLOW_PENDING,
 	RTL_FLAG_TASK_RESET_PENDING,
 	RTL_FLAG_TASK_PHY_PENDING,
@@ -7523,7 +7523,8 @@ static int rtl8169_close(struct net_devi
 	rtl8169_update_counters(dev);
 
 	rtl_lock_work(tp);
-	clear_bit(RTL_FLAG_TASK_ENABLED, tp->wk.flags);
+	/* Clear all task flags */
+	bitmap_zero(tp->wk.flags, RTL_FLAG_MAX);
 
 	rtl8169_down(dev);
 	rtl_unlock_work(tp);
@@ -7679,7 +7680,9 @@ static void rtl8169_net_suspend(struct n
 
 	rtl_lock_work(tp);
 	napi_disable(&tp->napi);
-	clear_bit(RTL_FLAG_TASK_ENABLED, tp->wk.flags);
+	/* Clear all task flags */
+	bitmap_zero(tp->wk.flags, RTL_FLAG_MAX);
+
 	rtl_unlock_work(tp);
 
 	rtl_pll_power_down(tp);