From: Arthur Kiyanovski <akiyano@amazon.com>
Date: Tue, 9 Oct 2018 11:21:28 +0300
Subject: net: ena: fix rare bug when failed restart/resume is followed by
 driver removal
Patch-mainline: v4.19-rc8
Git-commit: d7703ddbd7c9cb1ab7c08e1b85b314ff8cea38e9
References: bsc#1111696 bsc#1117561

In a rare scenario when ena_device_restore() fails, followed by device
remove, an FLR will not be issued. In this case, the device will keep
sending asynchronous AENQ keep-alive events, even after driver removal,
leading to memory corruption.

Fixes: 8c5c7abdeb2d ("net: ena: add power management ops to the ENA driver")
Signed-off-by: Arthur Kiyanovski <akiyano@amazon.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/net/ethernet/amazon/ena/ena_netdev.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/drivers/net/ethernet/amazon/ena/ena_netdev.c
+++ b/drivers/net/ethernet/amazon/ena/ena_netdev.c
@@ -2618,7 +2618,11 @@ err_disable_msix:
 	ena_free_mgmnt_irq(adapter);
 	ena_disable_msix(adapter);
 err_device_destroy:
+	ena_com_abort_admin_commands(ena_dev);
+	ena_com_wait_for_abort_completion(ena_dev);
 	ena_com_admin_destroy(ena_dev);
+	ena_com_mmio_reg_read_request_destroy(ena_dev);
+	ena_com_dev_reset(ena_dev, ENA_REGS_RESET_DRIVER_INVALID_STATE);
 err:
 	clear_bit(ENA_FLAG_DEVICE_RUNNING, &adapter->flags);
 	clear_bit(ENA_FLAG_ONGOING_RESET, &adapter->flags);