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Move the check for the MD_SHUTDOWN flag to before the tsleep() call

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in the per-device kthread. This ensures that synchronisation with
mddestroy() succeeds even if the kthread was not waiting in tsleep()
at the time of the wakeup(). Among other things, this fixes the
problem of mdconfig getting stuck when an attempt is made to use a
zero-length file as a vnode-type backing store.

Approved by:	re
This commit is contained in:
Ian Dowse 2002-11-30 22:03:53 +00:00
parent de5305d5b6
commit e176446dc8
1 changed files with 1 additions and 1 deletions
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2
sys/dev/md/md.c
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@ -577,12 +577,12 @@ md_kthread(void *arg)
bioq_remove(&sc->bio_queue, bp);
/* XXX: UNLOCK(unique unit numbers) */
if (!bp) {
tsleep(sc, PRIBIO, "mdwait", 0);
if (sc->flags & MD_SHUTDOWN) {
sc->procp = NULL;
wakeup(&sc->procp);
kthread_exit(0);
}
tsleep(sc, PRIBIO, "mdwait", 0);
continue;
}