From 10f4a9f3c9138dcce37fdcab0c32ac619a0f86c9 Mon Sep 17 00:00:00 2001
From: Taylor R Campbell <riastradh@NetBSD.org>
Date: Wed, 19 Jan 2022 01:56:05 +0000
Subject: [PATCH 22/37] specfs: Omit needless vdead_check in spec_fdiscard.
The vnode lock is held, so the vnode cannot be revoked without also
changing v_op so subsequent uses under the vnode lock will go to
deadfs's VOP_FDISCARD instead (which is genfs_eopnotsupp).
---
sys/miscfs/specfs/spec_vnops.c | 12 +-----------
1 file changed, 1 insertion(+), 11 deletions(-)
diff --git a/sys/miscfs/specfs/spec_vnops.c b/sys/miscfs/specfs/spec_vnops.c
index d3e848e60e2c..480e0ec606e9 100644
--- a/sys/miscfs/specfs/spec_vnops.c
+++ b/sys/miscfs/specfs/spec_vnops.c
@@ -946,17 +946,7 @@ spec_fdiscard(void *v)
dev_t dev;
vp = ap->a_vp;
- dev = NODEV;
-
- mutex_enter(vp->v_interlock);
- if (vdead_check(vp, VDEAD_NOWAIT) == 0 && vp->v_specnode != NULL) {
- dev = vp->v_rdev;
- }
- mutex_exit(vp->v_interlock);
-
- if (dev == NODEV) {
- return ENXIO;
- }
+ dev = vp->v_rdev;
switch (vp->v_type) {
case VCHR: