[PATCH 5.7 108/166] IB/hfi1: Do not destroy link_wq when the device is shut down

[Greg Kroah-Hartman]

From: Kaike Wan <kaike.wan@xxxxxxxxx>

commit 2315ec12ee8e8257bb335654c62e0cae71dc278d upstream.

The workqueue link_wq should only be destroyed when the hfi1 driver is
unloaded, not when the device is shut down.

Fixes: 71d47008ca1b ("IB/hfi1: Create workqueue for link events")
Link: https://lore.kernel.org/r/20200623204053.107638.70315.stgit@xxxxxxxxxxxxxxxxxxxx
Cc: <stable@xxxxxxxxxxxxxxx>
Reviewed-by: Mike Marciniszyn <mike.marciniszyn@xxxxxxxxx>
Signed-off-by: Kaike Wan <kaike.wan@xxxxxxxxx>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@xxxxxxxxx>
Signed-off-by: Jason Gunthorpe <jgg@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 drivers/infiniband/hw/hfi1/init.c |   10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

--- a/drivers/infiniband/hw/hfi1/init.c
+++ b/drivers/infiniband/hw/hfi1/init.c
@@ -844,6 +844,10 @@ static void destroy_workqueues(struct hf
 			destroy_workqueue(ppd->hfi1_wq);
 			ppd->hfi1_wq = NULL;
 		}
+		if (ppd->link_wq) {
+			destroy_workqueue(ppd->link_wq);
+			ppd->link_wq = NULL;
+		}
 	}
 }
 
@@ -1120,14 +1124,10 @@ static void shutdown_device(struct hfi1_
 		 * We can't count on interrupts since we are stopping.
 		 */
 		hfi1_quiet_serdes(ppd);
-
 		if (ppd->hfi1_wq)
 			flush_workqueue(ppd->hfi1_wq);
-		if (ppd->link_wq) {
+		if (ppd->link_wq)
 			flush_workqueue(ppd->link_wq);
-			destroy_workqueue(ppd->link_wq);
-			ppd->link_wq = NULL;
-		}
 	}
 	sdma_exit(dd);
 }