e1000: fix possible reset_task running after adapter down

commit 74a1b1ea8a30b035aaad833bbd6b9263e72acfac upstream.

On e1000_down(), we should ensure every asynchronous work is canceled
before proceeding. Since the watchdog_task can schedule other works
apart from itself, it should be stopped first, but currently it is
stopped after the reset_task. This can result in the following race
leading to the reset_task running after the module unload:

e1000_down_and_stop():			e1000_watchdog():
----------------------			-----------------

cancel_work_sync(reset_task)
					schedule_work(reset_task)
cancel_delayed_work_sync(watchdog_task)

The patch moves cancel_delayed_work_sync(watchdog_task) at the beginning
of e1000_down_and_stop() thus ensuring the race is impossible.

Cc: Tushar Dave <tushar.n.dave@intel.com>
Cc: Patrick McHardy <kaber@trash.net>
Signed-off-by: Vladimir Davydov <vdavydov@parallels.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>

diff --git a/drivers/net/ethernet/intel/e1000/e1000_main.c b/drivers/net/ethernet/intel/e1000/e1000_main.c
index 4ca676cb7f045c68d719d5eab142792d76604ce8..15c85d4f3774d2897885defb93bdd98b705e93fa 100644 (file)
--- a/drivers/net/ethernet/intel/e1000/e1000_main.c
+++ b/drivers/net/ethernet/intel/e1000/e1000_main.c
@@ -494,13 +494,20 @@ static void e1000_down_and_stop(struct e1000_adapter *adapter)
 {
        set_bit(__E1000_DOWN, &adapter->flags);
 
-       /* Only kill reset task if adapter is not resetting */
-       if (!test_bit(__E1000_RESETTING, &adapter->flags))
-               cancel_work_sync(&adapter->reset_task);
-
        cancel_delayed_work_sync(&adapter->watchdog_task);
+
+       /*
+        * Since the watchdog task can reschedule other tasks, we should cancel
+        * it first, otherwise we can run into the situation when a work is
+        * still running after the adapter has been turned down.
+        */
+
        cancel_delayed_work_sync(&adapter->phy_info_task);
        cancel_delayed_work_sync(&adapter->fifo_stall_task);
+
+       /* Only kill reset task if adapter is not resetting */
+       if (!test_bit(__E1000_RESETTING, &adapter->flags))
+               cancel_work_sync(&adapter->reset_task);
 }
 
 void e1000_down(struct e1000_adapter *adapter)