commit a156db2a69e615edacda5d283412a00a8db6cfb1
Author: Nick Hudson <skrll@netbsd.org>
Date:   Mon Jul 4 16:47:19 2022 +0100

    Turn a locking botch into a KASSERT

diff --git a/sys/dev/pci/if_wm.c b/sys/dev/pci/if_wm.c
index 66eef26fb826..5c90fdaa6cc4 100644
--- a/sys/dev/pci/if_wm.c
+++ b/sys/dev/pci/if_wm.c
@@ -8927,11 +8927,7 @@ wm_deferred_start_locked(struct wm_txqueue *txq)
 	int qid = wmq->wmq_id;
 
 	KASSERT(mutex_owned(txq->txq_lock));
-
-	if (txq->txq_stopping) {
-		mutex_exit(txq->txq_lock);
-		return;
-	}
+	KASSERT(!txq->txq_stopping);
 
 	if ((sc->sc_flags & WM_F_NEWQUEUE) != 0) {
 		/* XXX need for ALTQ or one CPU system */