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Instead of using an atomic operation to determine whether the devstat(9)

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device node has been created, pass MAKEDEV_CHECKNAME in so that the devfs
code will do the check.

Use a regular static variable as before, that's good enough to keep us from
calling into devfs most of the time.

Suggested by:	kib
MFC after:	1 week
Sponsored by:	Spectra Logic Corporation
This commit is contained in:
Kenneth D. Merry 2011-06-13 22:08:24 +00:00
parent 27c959cf05
commit 094efe753d
1 changed files with 5 additions and 3 deletions
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8
sys/kern/subr_devstat.c
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@ -470,9 +470,11 @@ devstat_alloc(void)
static int once;
mtx_assert(&devstat_mutex, MA_NOTOWNED);
if (!once && atomic_cmpset_int(&once, 0, 1)) {
make_dev_credf(MAKEDEV_ETERNAL, &devstat_cdevsw, 0, NULL,
UID_ROOT, GID_WHEEL, 0400, DEVSTAT_DEVICE_NAME);
if (!once) {
make_dev_credf(MAKEDEV_ETERNAL | MAKEDEV_CHECKNAME,
&devstat_cdevsw, 0, NULL, UID_ROOT, GID_WHEEL, 0400,
DEVSTAT_DEVICE_NAME);
once = 1;
}
spp2 = NULL;
mtx_lock(&devstat_mutex);