RDMA/bnxt_re: Fix system crash during load/unload

BugLink: http://bugs.launchpad.net/bugs/1786352
[ Upstream commit dcdaba08062b4726500b9456f8664bfda896c664 ]

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>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Khalid Elmously <khalid.elmously@canonical.com>

diff --git a/drivers/infiniband/hw/bnxt_re/main.c b/drivers/infiniband/hw/bnxt_re/main.c
index aafc19aa5de18537bb86cea9e2f28168e9238e2f..e31946b98f8097518339ef29b3ff62a77a7404b9 100644 (file)
--- a/drivers/infiniband/hw/bnxt_re/main.c
+++ b/drivers/infiniband/hw/bnxt_re/main.c
@@ -1411,6 +1411,11 @@ static void __exit bnxt_re_mod_exit(void)
 
        list_for_each_entry(rdev, &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);