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Enable loadable modules to be unloaded on alphas with shared isa

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interrupts  by only disabling the interrupt in hardware if
the handler being removed is the only handler.
This commit is contained in:
Andrew Gallatin 2003-04-10 20:32:29 +00:00
parent d8fed0f0f2
commit cbd0150530
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=113344
1 changed files with 20 additions and 8 deletions
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28
sys/alpha/isa/isa.c
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@ -389,17 +389,29 @@ isa_teardown_intr(device_t dev, device_t child,
struct resource *irq, void *cookie)
{
struct isa_intr *ii = cookie;
struct intrhand *ih, *handler = (struct intrhand *)ii->ih;
struct ithd *ithread = handler->ih_ithread;
int num_handlers = 0;
mtx_lock_spin(&icu_lock);
isa_intr_disable(irq->r_start);
mtx_unlock_spin(&icu_lock);
mtx_lock(&ithread->it_lock);
TAILQ_FOREACH(ih, &ithread->it_handlers, ih_next)
num_handlers++;
mtx_unlock(&ithread->it_lock);
/* only disable the interrupt in hardware if there are no
other handlers sharing it */
if (num_handlers == 1) {
mtx_lock_spin(&icu_lock);
isa_intr_disable(irq->r_start);
mtx_unlock_spin(&icu_lock);
if (platform.isa_teardown_intr) {
platform.isa_teardown_intr(dev, child, irq,
cookie);
return 0;
}
if (platform.isa_teardown_intr) {
platform.isa_teardown_intr(dev, child, irq, cookie);
return 0;
}
alpha_teardown_intr(ii->ih);
return 0;
}