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Merge from vmlocking: in cdev_tty() check d_tty != NULL.

This commit is contained in:
ad 2007-10-08 16:54:09 +00:00
parent 1d7050e5e2
commit d50d28b794
1 changed files with 6 additions and 2 deletions
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8
sys/kern/subr_devsw.c
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@ -1,4 +1,4 @@
/* $NetBSD: subr_devsw.c,v 1.11 2007/07/09 21:10:55 ad Exp $ */
/* $NetBSD: subr_devsw.c,v 1.12 2007/10/08 16:54:09 ad Exp $ */
/*-
* Copyright (c) 2001, 2002, 2007 The NetBSD Foundation, Inc.
@ -76,7 +76,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: subr_devsw.c,v 1.11 2007/07/09 21:10:55 ad Exp $");
__KERNEL_RCSID(0, "$NetBSD: subr_devsw.c,v 1.12 2007/10/08 16:54:09 ad Exp $");
#include <sys/param.h>
#include <sys/conf.h>
@ -795,6 +795,10 @@ cdev_tty(dev_t dev)
if ((d = cdevsw_lookup(dev)) == NULL)
return NULL;
/* XXX Check if necessary. */
if (d->d_tty == NULL)
return NULL;
DEV_LOCK(d);
rv = (*d->d_tty)(dev);
DEV_UNLOCK(d);