From 7757d1c2586617175fd124c67920169b278d3b97 Mon Sep 17 00:00:00 2001
From: Matthew Dillon <dillon@apollo.backplane.com>
Date: Wed, 25 Aug 2010 11:44:11 -0700
Subject: [PATCH] kernel - unlock pbuf prior to acquiring a spinlock

* In relpbuf() move the BUF_UNLOCK() outside the spinlock.
---
 sys/vm/vm_pager.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/sys/vm/vm_pager.c b/sys/vm/vm_pager.c
index 6899f3ba70..b939a62008 100644
--- a/sys/vm/vm_pager.c
+++ b/sys/vm/vm_pager.c
@@ -477,9 +477,9 @@ relpbuf(struct buf *bp, int *pfreecnt)
 	KKASSERT(bp->b_flags & B_PAGING);
 	dsched_exit_buf(bp);
 
-	spin_lock_wr(&bswspin);
-
 	BUF_UNLOCK(bp);
+
+	spin_lock_wr(&bswspin);
 	if (bp->b_kvabase) {
 		TAILQ_INSERT_HEAD(&bswlist_kva, bp, b_freelist);
 		++pbuf_kva_count;
@@ -499,7 +499,6 @@ relpbuf(struct buf *bp, int *pfreecnt)
 		if (++*pfreecnt == 1)
 			wake_freecnt = 1;
 	}
-
 	spin_unlock_wr(&bswspin);
 
 	if (wake_bsw_kva)
-- 
2.41.0