linux-kernel - [PATCH v2] r8169: Clear RTL_FLAG_TASK_*_PENDING when clearing RTL_FLAG_TASK

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Date:   Tue, 11 Sep 2018 01:51:43 +0800
From:   Kai-Heng Feng <kai.heng.feng@...onical.com>
To:     nic_swsd@...ltek.com
Cc:     davem@...emloft.net, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Kai-Heng Feng <kai.heng.feng@...onical.com>,
        Heiner Kallweit <hkallweit1@...il.com>
Subject: [PATCH v2] r8169: Clear RTL_FLAG_TASK_*_PENDING when clearing RTL_FLAG_TASK_ENABLED

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>
---
v2:
- Use bitmap_zero(), suggested by Florian Fainelli.
- Assign zero to first enum member in rtl_flag, just in case.

 drivers/net/ethernet/realtek/r8169.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/realtek/r8169.c b/drivers/net/ethernet/realtek/r8169.c
index b08d51bf7a20..a1bc6404d1d4 100644
--- a/drivers/net/ethernet/realtek/r8169.c
+++ b/drivers/net/ethernet/realtek/r8169.c
@@ -631,7 +631,7 @@ struct rtl8169_tc_offsets {
 };
 
 enum rtl_flag {
-	RTL_FLAG_TASK_ENABLED,
+	RTL_FLAG_TASK_ENABLED = 0,
 	RTL_FLAG_TASK_SLOW_PENDING,
 	RTL_FLAG_TASK_RESET_PENDING,
 	RTL_FLAG_MAX
@@ -6655,7 +6655,8 @@ static int rtl8169_close(struct net_device *dev)
 	rtl8169_update_counters(tp);
 
 	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);
@@ -6838,7 +6839,9 @@ static void rtl8169_net_suspend(struct net_device *dev)
 
 	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);
-- 
2.17.1