From 46b79678a884735323084fdea993485fe44175c6 Mon Sep 17 00:00:00 2001 From: imp Date: Wed, 19 Dec 2007 22:05:07 +0000 Subject: When devclass_get_maxunit is passed a NULL, return -1 to indicate that there's nothing allocated at all yet. --- sys/kern/subr_bus.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) (limited to 'sys/kern/subr_bus.c') diff --git a/sys/kern/subr_bus.c b/sys/kern/subr_bus.c index 420834a..89876d227 100644 --- a/sys/kern/subr_bus.c +++ b/sys/kern/subr_bus.c @@ -1220,13 +1220,16 @@ devclass_get_count(devclass_t dc) * @brief Get the maximum unit number used in a devclass * * Note that this is one greater than the highest currently-allocated - * unit. + * unit. If a null devclass_t is passed in, -1 is returned to indicate + * that not even the devclass has been allocated yet. * * @param dc the devclass to examine */ int devclass_get_maxunit(devclass_t dc) { + if (dc == NULL) + return (-1); return (dc->maxunit); } -- cgit v1.1