[PATCH v1] e1000e: Replace schedule_work with delayed workqueue for watchdog.

[Jagadeesh Yalapalli]

From: Jagadeesh <jagadeesh.yalapalli@xxxxxxxxxxxxxx>

    Replace direct schedule_work() usage with queue_delayed_work() to allow
    better timing control for the watchdog task. This resolves potential
    race conditions during interface reset operations.

    - Added watchdog_wq workqueue_struct and watchdog_dq delayed_work
    - Updated e1000_watchdog() to use queue_delayed_work()
    - Removed obsolete TODO comment about delayed workqueue

    Tested in Qemu :
    / # for i in {1..1000}; do
    >     echo 1 > /sys/class/net/eth0/device/reset
    >     sleep 0.1
    > done
    [  726.357499] e1000e 0000:00:02.0: resetting
    [  726.390737] e1000e 0000:00:02.0: reset done

Signed-off-by: Jagadeesh <jagadeesh.yalapalli@xxxxxxxxxxxxxx>
---
 drivers/net/ethernet/intel/e1000e/e1000.h  | 2 ++
 drivers/net/ethernet/intel/e1000e/netdev.c | 3 +--
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/intel/e1000e/e1000.h b/drivers/net/ethernet/intel/e1000e/e1000.h
index ba9c19e6994c..1e7b365c4f31 100644
--- a/drivers/net/ethernet/intel/e1000e/e1000.h
+++ b/drivers/net/ethernet/intel/e1000e/e1000.h
@@ -194,6 +194,8 @@ struct e1000_adapter {
 	struct timer_list blink_timer;
 
 	struct work_struct reset_task;
+	struct workqueue_struct *watchdog_wq;
+	struct delayed_work watchdog_dq;
 	struct work_struct watchdog_task;
 
 	const struct e1000_info *ei;
diff --git a/drivers/net/ethernet/intel/e1000e/netdev.c b/drivers/net/ethernet/intel/e1000e/netdev.c
index 8ebcb6a7d608..87a915d09f4e 100644
--- a/drivers/net/ethernet/intel/e1000e/netdev.c
+++ b/drivers/net/ethernet/intel/e1000e/netdev.c
@@ -5178,9 +5178,8 @@ static void e1000_watchdog(struct timer_list *t)
 	struct e1000_adapter *adapter = from_timer(adapter, t, watchdog_timer);
 
 	/* Do the rest outside of interrupt context */
-	schedule_work(&adapter->watchdog_task);
+	queue_delayed_work(adapter->watchdog_wq, &adapter->watchdog_dq, 0);
 
-	/* TODO: make this use queue_delayed_work() */
 }
 
 static void e1000_watchdog_task(struct work_struct *work)
-- 
2.43.0