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Make kldunload cbb work:

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o Implement the thread killing interlock as described by jhb in arch@
  while talking to markm.
o Hold Giant around cbb_insert()/cbb_remove().  Deep in the belly of
  the vm code we panic if we don't hold this when we activate the memory
  for reading the CIS.
o If we had to do the kludge alloc, then do a kludge free.
This commit is contained in:
imp 2002-10-08 03:53:52 +00:00
parent cb71b7bb07
commit 2af88da4a8
1 changed files with 17 additions and 22 deletions
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39
sys/dev/pccbb/pccbb.c
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@ -732,20 +732,18 @@ cbb_detach(device_t brdev)
sc->flags |= CBB_KTHREAD_DONE;
if (sc->flags & CBB_KTHREAD_RUNNING) {
cv_broadcast(&sc->cv);
mtx_unlock(&sc->mtx);
DEVPRINTF((brdev, "waiting for kthread exit..."));
error = tsleep(sc, PWAIT, "cbb-detach-wait", 60 * hz);
if (error)
DPRINTF(("timeout\n"));
else
DPRINTF(("done\n"));
} else {
mtx_unlock(&sc->mtx);
msleep(sc->event_thread, &sc->mtx, PWAIT, "cbbun", 0);
}
mtx_unlock(&sc->mtx);
bus_release_resource(brdev, SYS_RES_IRQ, 0, sc->irq_res);
bus_release_resource(brdev, SYS_RES_MEMORY, CBBR_SOCKBASE,
sc->base_res);
if (sc->flags & CBB_KLUDGE_ALLOC)
bus_generic_release_resource(device_get_parent(brdev),
brdev, SYS_RES_MEMORY, CBBR_SOCKBASE,
sc->base_res);
else
bus_release_resource(brdev, SYS_RES_MEMORY,
CBBR_SOCKBASE, sc->base_res);
mtx_destroy(&sc->mtx);
cv_destroy(&sc->cv);
return (0);
@ -898,10 +896,11 @@ cbb_event_thread(void *arg)
int err;
/*
* We take out Giant here because we drop it in tsleep
* and need it for kthread_exit, which drops it.
* We take out Giant here because we need it deep, down in
* the bowels of the vm system for mapping the memory we need
* to read the CIS. We also need it for kthread_exit, which
* drops it.
*/
mtx_lock(&Giant);
sc->flags |= CBB_KTHREAD_RUNNING;
while (1) {
/*
@ -913,10 +912,13 @@ cbb_event_thread(void *arg)
break;
status = cbb_get(sc, CBB_SOCKET_STATE);
mtx_lock(&Giant);
if ((status & CBB_SOCKET_STAT_CD) == 0)
cbb_insert(sc);
else
cbb_removal(sc);
mtx_unlock(&Giant);
/*
* Wait until it has been 1s since the last time we
* get an interrupt. We handle the rest of the interrupt
@ -931,14 +933,7 @@ cbb_event_thread(void *arg)
mtx_unlock(&sc->mtx);
}
sc->flags &= ~CBB_KTHREAD_RUNNING;
/*
* XXX I think there's a race here. If we wakeup in the other
* thread before kthread_exit is called and this routine returns,
* and that thread causes us to be unmapped, then we are setting
* ourselves up for a panic. Make sure that I check out
* jhb's crash.c for a fix.
*/
wakeup(sc);
mtx_lock(&Giant);
kthread_exit(0);
}