[PATCH 5.8 28/70] bnxt_en: Fix regression in workqueue cleanup logic in bnxt_remove_one().

[Greg Kroah-Hartman]

From: Vasundhara Volam <vasundhara-v.vo...@broadcom.com>

[ Upstream commit 21d6a11e2cadfb8446265a3efff0e2aad206e15e ]

A recent patch has moved the workqueue cleanup logic before
calling unregister_netdev() in bnxt_remove_one().  This caused a
regression because the workqueue can be restarted if the device is
still open.  Workqueue cleanup must be done after unregister_netdev().
The workqueue will not restart itself after the device is closed.

Call bnxt_cancel_sp_work() after unregister_netdev() and
call bnxt_dl_fw_reporters_destroy() after that.  This fixes the
regession and the original NULL ptr dereference issue.

Fixes: b16939b59cc0 ("bnxt_en: Fix NULL ptr dereference crash in 
bnxt_fw_reset_task()")
Signed-off-by: Vasundhara Volam <vasundhara-v.vo...@broadcom.com>
Signed-off-by: Michael Chan <michael.c...@broadcom.com>
Signed-off-by: Jakub Kicinski <k...@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
 drivers/net/ethernet/broadcom/bnxt/bnxt.c |    9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
@@ -11508,15 +11508,16 @@ static void bnxt_remove_one(struct pci_d
        if (BNXT_PF(bp))
                bnxt_sriov_disable(bp);
 
+       if (BNXT_PF(bp))
+               devlink_port_type_clear(&bp->dl_port);
+       pci_disable_pcie_error_reporting(pdev);
+       unregister_netdev(dev);
        clear_bit(BNXT_STATE_IN_FW_RESET, &bp->state);
+       /* Flush any pending tasks */
        bnxt_cancel_sp_work(bp);
        bp->sp_event = 0;
 
        bnxt_dl_fw_reporters_destroy(bp, true);
-       if (BNXT_PF(bp))
-               devlink_port_type_clear(&bp->dl_port);
-       pci_disable_pcie_error_reporting(pdev);
-       unregister_netdev(dev);
        bnxt_dl_unregister(bp);
        bnxt_shutdown_tc(bp);