From 8e76f1cefa385812b9d3e31763425ef47ea98298 Mon Sep 17 00:00:00 2001
From: phk <phk@FreeBSD.org>
Date: Sun, 23 Mar 2003 23:01:40 +0000
Subject: [PATCH] Introduce g_cancel_events() and use it a couple of places
 where it makes sense.

---
 sys/geom/geom_event.c | 22 ++++++++++++++++++++++
 sys/geom/geom_int.h   |  1 +
 sys/geom/geom_subr.c  |  3 +++
 3 files changed, 26 insertions(+)

diff --git a/sys/geom/geom_event.c b/sys/geom/geom_event.c
index d726a0110304..5413a3429f3c 100644
--- a/sys/geom/geom_event.c
+++ b/sys/geom/geom_event.c
@@ -324,6 +324,28 @@ g_post_event(enum g_events ev, struct g_class *mp, struct g_geom *gp, struct g_p
 	wakeup(&g_wait_event);
 }
 
+void
+g_cancel_event(struct g_class *mp, struct g_geom *gp, struct g_provider *pp, struct g_consumer *cp)
+{
+	struct g_event *ep, *epn;
+
+	mtx_lock(&g_eventlock);
+	ep = TAILQ_FIRST(&g_events);
+	for (;ep != NULL;) {
+		epn = TAILQ_NEXT(ep, events);
+		if (
+		    (ep->class != NULL && ep->class == mp) ||
+		    (ep->geom != NULL && ep->geom == gp) ||
+		    (ep->provider != NULL && ep->provider == pp) ||
+		    (ep->consumer != NULL && ep->consumer == cp)) {
+			TAILQ_REMOVE(&g_events, ep, events);
+			g_free(ep);
+		}
+		ep = epn;
+	}
+	mtx_unlock(&g_eventlock);
+}
+
 int
 g_call_me(g_call_me_t *func, void *arg)
 {
diff --git a/sys/geom/geom_int.h b/sys/geom/geom_int.h
index b56895b3e712..26b3d7884be4 100644
--- a/sys/geom/geom_int.h
+++ b/sys/geom/geom_int.h
@@ -93,6 +93,7 @@ void g_conftxt(void *);
 /* geom_event.c */
 void g_event_init(void);
 void g_post_event(enum g_events ev, struct g_class *mp, struct g_geom *gp, struct g_provider *pp, struct g_consumer *cp);
+void g_cancel_event(struct g_class *mp, struct g_geom *gp, struct g_provider *pp, struct g_consumer *cp);
 void g_run_events(void);
 void g_stall_events(void);
 void g_release_events(void);
diff --git a/sys/geom/geom_subr.c b/sys/geom/geom_subr.c
index b5c1861edcc9..f047b59ca971 100644
--- a/sys/geom/geom_subr.c
+++ b/sys/geom/geom_subr.c
@@ -126,6 +126,7 @@ g_destroy_geom(struct g_geom *gp)
 	KASSERT(LIST_EMPTY(&gp->provider),
 	    ("g_destroy_geom(%s) with provider(s) [%p]",
 	    gp->name, LIST_FIRST(&gp->consumer)));
+	g_cancel_event(NULL, gp, NULL, NULL);
 	LIST_REMOVE(gp, geom);
 	TAILQ_REMOVE(&geoms, gp, geoms);
 	g_free(gp->name);
@@ -162,6 +163,7 @@ g_destroy_consumer(struct g_consumer *cp)
 	KASSERT (cp->acr == 0, ("g_destroy_consumer with acr"));
 	KASSERT (cp->acw == 0, ("g_destroy_consumer with acw"));
 	KASSERT (cp->ace == 0, ("g_destroy_consumer with ace"));
+	g_cancel_event(NULL, NULL, NULL, cp);
 	LIST_REMOVE(cp, consumer);
 	devstat_remove_entry(cp->stat);
 	g_free(cp);
@@ -216,6 +218,7 @@ g_destroy_provider(struct g_provider *pp)
 	KASSERT (pp->acr == 0, ("g_destroy_provider with acr"));
 	KASSERT (pp->acw == 0, ("g_destroy_provider with acw"));
 	KASSERT (pp->acw == 0, ("g_destroy_provider with ace"));
+	g_cancel_event(NULL, NULL, pp, NULL);
 	g_nproviders--;
 	LIST_REMOVE(pp, provider);
 	gp = pp->geom;