[PATCH net V2 4/7] net: ena: fix potential double ena_destroy_device()

[netanel]

From: Netanel Belgazal <neta...@amazon.com>

ena_destroy_device() can potentially be called twice.
To avoid this, check that the device is running and
only then proceed destroying it.

Signed-off-by: Netanel Belgazal <neta...@amazon.com>
---
 drivers/net/ethernet/amazon/ena/ena_netdev.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/net/ethernet/amazon/ena/ena_netdev.c 
b/drivers/net/ethernet/amazon/ena/ena_netdev.c
index 035d47d2179a..a68c2a8d4da2 100644
--- a/drivers/net/ethernet/amazon/ena/ena_netdev.c
+++ b/drivers/net/ethernet/amazon/ena/ena_netdev.c
@@ -2556,6 +2556,9 @@ static void ena_destroy_device(struct ena_adapter 
*adapter, bool graceful)
        struct ena_com_dev *ena_dev = adapter->ena_dev;
        bool dev_up;
 
+       if (!test_bit(ENA_FLAG_DEVICE_RUNNING, &adapter->flags))
+               return;
+
        netif_carrier_off(netdev);
 
        del_timer_sync(&adapter->timer_service);
@@ -2592,6 +2595,7 @@ static void ena_destroy_device(struct ena_adapter 
*adapter, bool graceful)
        adapter->reset_reason = ENA_REGS_RESET_NORMAL;
 
        clear_bit(ENA_FLAG_TRIGGER_RESET, &adapter->flags);
+       clear_bit(ENA_FLAG_DEVICE_RUNNING, &adapter->flags);
 }
 
 static int ena_restore_device(struct ena_adapter *adapter)
@@ -2636,6 +2640,7 @@ static int ena_restore_device(struct ena_adapter *adapter)
                }
        }
 
+       set_bit(ENA_FLAG_DEVICE_RUNNING, &adapter->flags);
        mod_timer(&adapter->timer_service, round_jiffies(jiffies + HZ));
        dev_err(&pdev->dev, "Device reset completed successfully\n");
 
-- 
2.15.2.AMZN