From 9a7f7c26c5b280924072e2d9947ad39ef4cc022c Mon Sep 17 00:00:00 2001
From: Mitchell Horne <mhorne@FreeBSD.org>
Date: Wed, 22 Feb 2023 11:11:15 -0400
Subject: [PATCH] lockmgr: upgrade panic return checks

We short-circuit lockmgr functions in the face of a kernel panic. Other
lock implementations do this with a SCHEDULER_STOPPED() check, which
covers the additional case where the debugger is active but the system
has not panicked. Update this code to match that behaviour.

Reviewed by:	mjg, kib, markj
MFC after:	1 week
Differential Revision:	https://reviews.freebsd.org/D38655
---
 sys/kern/kern_lock.c | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/sys/kern/kern_lock.c b/sys/kern/kern_lock.c
index 2eb4feb7c4b5..ee34e03188a5 100644
--- a/sys/kern/kern_lock.c
+++ b/sys/kern/kern_lock.c
@@ -603,7 +603,7 @@ lockmgr_slock_hard(struct lock *lk, u_int flags, struct lock_object *ilk,
 #endif
 	struct lock_delay_arg lda;
 
-	if (KERNEL_PANICKED())
+	if (SCHEDULER_STOPPED())
 		goto out;
 
 	tid = (uintptr_t)curthread;
@@ -789,7 +789,7 @@ lockmgr_xlock_hard(struct lock *lk, u_int flags, struct lock_object *ilk,
 #endif
 	struct lock_delay_arg lda;
 
-	if (KERNEL_PANICKED())
+	if (SCHEDULER_STOPPED())
 		goto out;
 
 	tid = (uintptr_t)curthread;
@@ -985,7 +985,7 @@ lockmgr_upgrade(struct lock *lk, u_int flags, struct lock_object *ilk,
 	int error = 0;
 	int op;
 
-	if (KERNEL_PANICKED())
+	if (SCHEDULER_STOPPED())
 		goto out;
 
 	tid = (uintptr_t)curthread;
@@ -1046,7 +1046,7 @@ lockmgr_lock_flags(struct lock *lk, u_int flags, struct lock_object *ilk,
 	u_int op;
 	bool locked;
 
-	if (KERNEL_PANICKED())
+	if (SCHEDULER_STOPPED())
 		return (0);
 
 	op = flags & LK_TYPE_MASK;
@@ -1109,7 +1109,7 @@ lockmgr_sunlock_hard(struct lock *lk, uintptr_t x, u_int flags, struct lock_obje
 {
 	int wakeup_swapper = 0;
 
-	if (KERNEL_PANICKED())
+	if (SCHEDULER_STOPPED())
 		goto out;
 
 	wakeup_swapper = wakeupshlk(lk, file, line);
@@ -1128,7 +1128,7 @@ lockmgr_xunlock_hard(struct lock *lk, uintptr_t x, u_int flags, struct lock_obje
 	u_int realexslp;
 	int queue;
 
-	if (KERNEL_PANICKED())
+	if (SCHEDULER_STOPPED())
 		goto out;
 
 	tid = (uintptr_t)curthread;
@@ -1320,7 +1320,7 @@ __lockmgr_args(struct lock *lk, u_int flags, struct lock_object *ilk,
 	int contested = 0;
 #endif
 
-	if (KERNEL_PANICKED())
+	if (SCHEDULER_STOPPED())
 		return (0);
 
 	error = 0;
@@ -1729,7 +1729,7 @@ _lockmgr_assert(const struct lock *lk, int what, const char *file, int line)
 {
 	int slocked = 0;
 
-	if (KERNEL_PANICKED())
+	if (SCHEDULER_STOPPED())
 		return;
 	switch (what) {
 	case KA_SLOCKED: