RDMA/bnxt_re: Fix system crash during load/unload

During driver unload, the driver proceeds with cleanup
without waiting for the scheduled events. So the device
pointers get freed up and driver crashes when the events
are scheduled later.

Flush the bnxt_re_task work queue before starting
device removal.

Signed-off-by: Selvin Xavier <selvin.xavier@broadcom.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

diff --git a/drivers/infiniband/hw/bnxt_re/main.c b/drivers/infiniband/hw/bnxt_re/main.c
index 508d00a5a1066cabd3e6ac7fc4855abbf19235e8..7f9298db507b41cde9803ad111d7c75b7932adea 100644 (file)
--- a/drivers/infiniband/hw/bnxt_re/main.c
+++ b/drivers/infiniband/hw/bnxt_re/main.c
@@ -1578,6 +1578,11 @@ static void __exit bnxt_re_mod_exit(void)
        */
        list_for_each_entry_safe_reverse(rdev, next, &to_be_deleted, list) {
                dev_info(rdev_to_dev(rdev), "Unregistering Device");
+               /*
+                * Flush out any scheduled tasks before destroying the
+                * resources
+                */
+               flush_workqueue(bnxt_re_wq);
                bnxt_re_dev_stop(rdev);
                bnxt_re_ib_unreg(rdev, true);
                bnxt_re_remove_one(rdev);