From b148bb238c02f0c7797efed026e9bba5892d2172 Mon Sep 17 00:00:00 2001 From: Michael Chan Date: Wed, 26 Aug 2020 01:08:36 -0400 Subject: [PATCH] bnxt_en: Fix possible crash in bnxt_fw_reset_task(). bnxt_fw_reset_task() is run from a delayed workqueue. The current code is not cancelling the workqueue in the driver's .remove() method and it can potentially crash if the device is removed with the workqueue still pending. The fix is to clear the BNXT_STATE_IN_FW_RESET flag and then cancel the delayed workqueue in bnxt_remove_one(). bnxt_queue_fw_reset_work() also needs to check that this flag is set before scheduling. This will guarantee that no rescheduling will be done after it is cancelled. Fixes: 230d1f0de754 ("bnxt_en: Handle firmware reset.") Reviewed-by: Vasundhara Volam Signed-off-by: Michael Chan Signed-off-by: David S. Miller --- drivers/net/ethernet/broadcom/bnxt/bnxt.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c index 4389a74..d6f3592 100644 --- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c +++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c @@ -1141,6 +1141,9 @@ static int bnxt_discard_rx(struct bnxt *bp, struct bnxt_cp_ring_info *cpr, static void bnxt_queue_fw_reset_work(struct bnxt *bp, unsigned long delay) { + if (!(test_bit(BNXT_STATE_IN_FW_RESET, &bp->state))) + return; + if (BNXT_PF(bp)) queue_delayed_work(bnxt_pf_wq, &bp->fw_reset_task, delay); else @@ -1157,10 +1160,12 @@ static void bnxt_queue_sp_work(struct bnxt *bp) static void bnxt_cancel_sp_work(struct bnxt *bp) { - if (BNXT_PF(bp)) + if (BNXT_PF(bp)) { flush_workqueue(bnxt_pf_wq); - else + } else { cancel_work_sync(&bp->sp_task); + cancel_delayed_work_sync(&bp->fw_reset_task); + } } static void bnxt_sched_reset(struct bnxt *bp, struct bnxt_rx_ring_info *rxr) @@ -11761,6 +11766,7 @@ static void bnxt_remove_one(struct pci_dev *pdev) unregister_netdev(dev); bnxt_dl_unregister(bp); bnxt_shutdown_tc(bp); + clear_bit(BNXT_STATE_IN_FW_RESET, &bp->state); bnxt_cancel_sp_work(bp); bp->sp_event = 0; -- 2.7.4