From: Alexander Duyck <alexander.h.duyck@xxxxxxxxxxxxxxx>
We are seeing a deadlock in e1000 down when NAPI is being disabled. Looking
over the kernel function trace of the system it appears that the interface
is being closed and then a reset is hitting which deadlocks the interface
as the NAPI interface is already disabled.
To prevent this from happening I am disabling the reset task when
__E1000_DOWN is already set. In addition code has been added so that we set
the __E1000_DOWN while holding the __E1000_RESET flag in e1000_close in
order to guarantee that the reset task will not run after we have started
the close call.
CC: stable <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Alexander Duyck <alexander.h.duyck@xxxxxxxxxxxxxxx>
Tested-by: Maxim Zhukov <mussitantesmortem@xxxxxxxxx>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@xxxxxxxxx>
---
drivers/net/ethernet/intel/e1000/e1000_main.c | 18 ++++++++++++++----
1 file changed, 14 insertions(+), 4 deletions(-)
diff --git a/drivers/net/ethernet/intel/e1000/e1000_main.c b/drivers/net/ethernet/intel/e1000/e1000_main.c
index 05bc6e216bca..d9fa4600f745 100644
--- a/drivers/net/ethernet/intel/e1000/e1000_main.c
+++ b/drivers/net/ethernet/intel/e1000/e1000_main.c
@@ -542,8 +542,13 @@ void e1000_reinit_locked(struct e1000_adapter *adapter)
WARN_ON(in_interrupt());
while (test_and_set_bit(__E1000_RESETTING, &adapter->flags))
msleep(1);
- e1000_down(adapter);
- e1000_up(adapter);
+
+ /* only run the task if not already down */
+ if (!test_bit(__E1000_DOWN, &adapter->flags)) {
+ e1000_down(adapter);
+ e1000_up(adapter);
+ }
+
clear_bit(__E1000_RESETTING, &adapter->flags);
}
@@ -1433,10 +1438,15 @@ int e1000_close(struct net_device *netdev)
struct e1000_hw *hw = &adapter->hw;
int count = E1000_CHECK_RESET_COUNT;
- while (test_bit(__E1000_RESETTING, &adapter->flags) && count--)
+ while (test_and_set_bit(__E1000_RESETTING, &adapter->flags) && count--)
usleep_range(10000, 20000);
- WARN_ON(test_bit(__E1000_RESETTING, &adapter->flags));
+ WARN_ON(count < 0);
+
+ /* signal that we're down so that the reset task will no longer run */
+ set_bit(__E1000_DOWN, &adapter->flags);
+ clear_bit(__E1000_RESETTING, &adapter->flags);
+
e1000_down(adapter);
e1000_power_down_phy(adapter);
e1000_free_irq(adapter);
--
2.26.2
