diff --git a/sys/dev/sound/pcm/vchan.c b/sys/dev/sound/pcm/vchan.c
--- a/sys/dev/sound/pcm/vchan.c
+++ b/sys/dev/sound/pcm/vchan.c
@@ -497,9 +497,7 @@
 	KASSERT(direction == c->direction, ("%s(): invalid direction %d/%d",
 	    __func__, direction, c->direction));
 
-	CHN_LOCK(c);
-	newspd = c->speed;
-	CHN_UNLOCK(c);
+	newspd = *vchanrate;
 
 	ret = sysctl_handle_int(oidp, &newspd, 0, req);
 	if (ret != 0 || req->newptr == NULL) {
@@ -527,10 +525,10 @@
 			newspd = CHANNEL_SETSPEED(c->methods,
 			    c->devinfo, newspd);
 		}
+		*vchanrate = newspd;
 
 		ret = chn_reset(c, c->format, newspd);
 		if (ret == 0) {
-			*vchanrate = c->speed;
 			if (restart != 0) {
 				CHN_FOREACH(ch, c, children.busy) {
 					CHN_LOCK(ch);
@@ -605,15 +603,11 @@
 	KASSERT(direction == c->direction, ("%s(): invalid direction %d/%d",
 	    __func__, direction, c->direction));
 
-	CHN_LOCK(c);
-
 	bzero(fmtstr, sizeof(fmtstr));
 
-	if (snd_afmt2str(c->format, fmtstr, sizeof(fmtstr)) != c->format)
+	if (snd_afmt2str(*vchanformat, fmtstr, sizeof(fmtstr)) != *vchanformat)
 		strlcpy(fmtstr, "<ERROR>", sizeof(fmtstr));
 
-	CHN_UNLOCK(c);
-
 	ret = sysctl_handle_string(oidp, fmtstr, sizeof(fmtstr), req);
 	if (ret != 0 || req->newptr == NULL) {
 		PCM_RELEASE_QUICK(d);
@@ -634,10 +628,10 @@
 			restart = 1;
 		} else
 			restart = 0;
+		*vchanformat = newfmt;
 
 		ret = chn_reset(c, newfmt, c->speed);
 		if (ret == 0) {
-			*vchanformat = c->format;
 			if (restart != 0) {
 				CHN_FOREACH(ch, c, children.busy) {
 					CHN_LOCK(ch);