From 5dd2cd84fe935437286d31918a2e395dd887d352 Mon Sep 17 00:00:00 2001
From: phk <phk@FreeBSD.org>
Date: Fri, 24 Sep 2004 08:12:41 +0000
Subject: Hold thread reference while we frob cdevsw.

---
 sys/dev/snp/snp.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

(limited to 'sys/dev/snp')

diff --git a/sys/dev/snp/snp.c b/sys/dev/snp/snp.c
index 6103a5d..a414d7c 100644
--- a/sys/dev/snp/snp.c
+++ b/sys/dev/snp/snp.c
@@ -184,11 +184,17 @@ snpdevtotty(dev)
 	struct cdev *dev;
 {
 	struct cdevsw *cdp;
+	struct tty *tp;
 
-	cdp = devsw(dev);
-	if (cdp == NULL || (cdp->d_flags & D_TTY) == 0)
+	cdp = dev_refthread(dev);
+	if (cdp == NULL)
 		return (NULL);
-	return (dev->si_tty);
+	if (!(cdp->d_flags & D_TTY))
+		tp = NULL;
+	else
+		tp = dev->si_tty;
+	dev_relthread(dev);
+	return (tp);
 }
 
 #define SNP_INPUT_BUF	5	/* This is even too much, the maximal
-- 
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