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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Netanel Belgazal <netanel@amazon.com>,
        "David S. Miller" <davem@davemloft.net>,
        Sasha Levin <alexander.levin@microsoft.com>
Subject: [PATCH 4.18 122/168] net: ena: fix missing lock during device destruction
Date:   Mon,  8 Oct 2018 20:31:42 +0200
Message-Id: <20181008175624.688478781@linuxfoundation.org>
In-Reply-To: <20181008175620.043587728@linuxfoundation.org>
References: <20181008175620.043587728@linuxfoundation.org>
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4.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Netanel Belgazal <netanel@amazon.com>

[ Upstream commit 944b28aa2982b4590d4d4dfc777cf85135dca2c0 ]

acquire the rtnl_lock during device destruction to avoid
using partially destroyed device.

ena_remove() shares almost the same logic as ena_destroy_device(),
so use ena_destroy_device() and avoid duplications.

Signed-off-by: Netanel Belgazal <netanel@amazon.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/net/ethernet/amazon/ena/ena_netdev.c |   20 +++++++-------------
 1 file changed, 7 insertions(+), 13 deletions(-)

--- a/drivers/net/ethernet/amazon/ena/ena_netdev.c
+++ b/drivers/net/ethernet/amazon/ena/ena_netdev.c
@@ -3420,24 +3420,18 @@ static void ena_remove(struct pci_dev *p
 
 	unregister_netdev(netdev);
 
-	/* Reset the device only if the device is running. */
+	/* If the device is running then we want to make sure the device will be
+	 * reset to make sure no more events will be issued by the device.
+	 */
 	if (test_bit(ENA_FLAG_DEVICE_RUNNING, &adapter->flags))
-		ena_com_dev_reset(ena_dev, adapter->reset_reason);
+		set_bit(ENA_FLAG_TRIGGER_RESET, &adapter->flags);
 
-	ena_free_mgmnt_irq(adapter);
-
-	ena_disable_msix(adapter);
+	rtnl_lock();
+	ena_destroy_device(adapter, true);
+	rtnl_unlock();
 
 	free_netdev(netdev);
 
-	ena_com_mmio_reg_read_request_destroy(ena_dev);
-
-	ena_com_abort_admin_commands(ena_dev);
-
-	ena_com_wait_for_abort_completion(ena_dev);
-
-	ena_com_admin_destroy(ena_dev);
-
 	ena_com_rss_destroy(ena_dev);
 
 	ena_com_delete_debug_area(ena_dev);