cpu_relax();
/* Ok, that indicated we're done: double-check carefully. */
- spin_lock_irqsave(&desc->lock, flags);
+ raw_spin_lock_irqsave(&desc->lock, flags);
status = desc->status;
- spin_unlock_irqrestore(&desc->lock, flags);
+ raw_spin_unlock_irqrestore(&desc->lock, flags);
/* Oops, that failed? */
} while (status & IRQ_INPROGRESS);
if (!desc->chip->set_affinity)
return -EINVAL;
- spin_lock_irqsave(&desc->lock, flags);
+ raw_spin_lock_irqsave(&desc->lock, flags);
#ifdef CONFIG_GENERIC_PENDING_IRQ
if (desc->status & IRQ_MOVE_PCNTXT) {
}
#endif
desc->status |= IRQ_AFFINITY_SET;
- spin_unlock_irqrestore(&desc->lock, flags);
+ raw_spin_unlock_irqrestore(&desc->lock, flags);
return 0;
}
unsigned long flags;
int ret;
- spin_lock_irqsave(&desc->lock, flags);
+ raw_spin_lock_irqsave(&desc->lock, flags);
ret = setup_affinity(irq, desc);
if (!ret)
irq_set_thread_affinity(desc);
- spin_unlock_irqrestore(&desc->lock, flags);
+ raw_spin_unlock_irqrestore(&desc->lock, flags);
return ret;
}
return;
chip_bus_lock(irq, desc);
- spin_lock_irqsave(&desc->lock, flags);
+ raw_spin_lock_irqsave(&desc->lock, flags);
__disable_irq(desc, irq, false);
- spin_unlock_irqrestore(&desc->lock, flags);
+ raw_spin_unlock_irqrestore(&desc->lock, flags);
chip_bus_sync_unlock(irq, desc);
}
EXPORT_SYMBOL(disable_irq_nosync);
return;
chip_bus_lock(irq, desc);
- spin_lock_irqsave(&desc->lock, flags);
+ raw_spin_lock_irqsave(&desc->lock, flags);
__enable_irq(desc, irq, false);
- spin_unlock_irqrestore(&desc->lock, flags);
+ raw_spin_unlock_irqrestore(&desc->lock, flags);
chip_bus_sync_unlock(irq, desc);
}
EXPORT_SYMBOL(enable_irq);
/* wakeup-capable irqs can be shared between drivers that
* don't need to have the same sleep mode behaviors.
*/
- spin_lock_irqsave(&desc->lock, flags);
+ raw_spin_lock_irqsave(&desc->lock, flags);
if (on) {
if (desc->wake_depth++ == 0) {
ret = set_irq_wake_real(irq, on);
}
}
- spin_unlock_irqrestore(&desc->lock, flags);
+ raw_spin_unlock_irqrestore(&desc->lock, flags);
return ret;
}
EXPORT_SYMBOL(set_irq_wake);
{
struct irq_desc *desc = irq_to_desc(irq);
struct irqaction *action;
+ unsigned long flags;
if (!desc)
return 0;
if (desc->status & IRQ_NOREQUEST)
return 0;
+ raw_spin_lock_irqsave(&desc->lock, flags);
action = desc->action;
if (action)
if (irqflags & action->flags & IRQF_SHARED)
action = NULL;
+ raw_spin_unlock_irqrestore(&desc->lock, flags);
+
return !action;
}
*/
static void irq_finalize_oneshot(unsigned int irq, struct irq_desc *desc)
{
+again:
chip_bus_lock(irq, desc);
- spin_lock_irq(&desc->lock);
+ raw_spin_lock_irq(&desc->lock);
+
+ /*
+ * Implausible though it may be we need to protect us against
+ * the following scenario:
+ *
+ * The thread is faster done than the hard interrupt handler
+ * on the other CPU. If we unmask the irq line then the
+ * interrupt can come in again and masks the line, leaves due
+ * to IRQ_INPROGRESS and the irq line is masked forever.
+ */
+ if (unlikely(desc->status & IRQ_INPROGRESS)) {
+ raw_spin_unlock_irq(&desc->lock);
+ chip_bus_sync_unlock(irq, desc);
+ cpu_relax();
+ goto again;
+ }
+
if (!(desc->status & IRQ_DISABLED) && (desc->status & IRQ_MASKED)) {
desc->status &= ~IRQ_MASKED;
desc->chip->unmask(irq);
}
- spin_unlock_irq(&desc->lock);
+ raw_spin_unlock_irq(&desc->lock);
chip_bus_sync_unlock(irq, desc);
}
return;
}
- spin_lock_irq(&desc->lock);
+ raw_spin_lock_irq(&desc->lock);
cpumask_copy(mask, desc->affinity);
- spin_unlock_irq(&desc->lock);
+ raw_spin_unlock_irq(&desc->lock);
set_cpus_allowed_ptr(current, mask);
free_cpumask_var(mask);
atomic_inc(&desc->threads_active);
- spin_lock_irq(&desc->lock);
+ raw_spin_lock_irq(&desc->lock);
if (unlikely(desc->status & IRQ_DISABLED)) {
/*
* CHECKME: We might need a dedicated
* retriggers the interrupt itself --- tglx
*/
desc->status |= IRQ_PENDING;
- spin_unlock_irq(&desc->lock);
+ raw_spin_unlock_irq(&desc->lock);
} else {
- spin_unlock_irq(&desc->lock);
+ raw_spin_unlock_irq(&desc->lock);
action->thread_fn(action->irq, action->dev_id);
/*
* The following block of code has to be executed atomically
*/
- spin_lock_irqsave(&desc->lock, flags);
+ raw_spin_lock_irqsave(&desc->lock, flags);
old_ptr = &desc->action;
old = *old_ptr;
if (old) {
if (new->flags & IRQF_ONESHOT)
desc->status |= IRQ_ONESHOT;
+ /*
+ * Force MSI interrupts to run with interrupts
+ * disabled. The multi vector cards can cause stack
+ * overflows due to nested interrupts when enough of
+ * them are directed to a core and fire at the same
+ * time.
+ */
+ if (desc->msi_desc)
+ new->flags |= IRQF_DISABLED;
+
if (!(desc->status & IRQ_NOAUTOEN)) {
desc->depth = 0;
desc->status &= ~IRQ_DISABLED;
__enable_irq(desc, irq, false);
}
- spin_unlock_irqrestore(&desc->lock, flags);
+ raw_spin_unlock_irqrestore(&desc->lock, flags);
/*
* Strictly no need to wake it up, but hung_task complains
ret = -EBUSY;
out_thread:
- spin_unlock_irqrestore(&desc->lock, flags);
+ raw_spin_unlock_irqrestore(&desc->lock, flags);
if (new->thread) {
struct task_struct *t = new->thread;
if (!desc)
return NULL;
- spin_lock_irqsave(&desc->lock, flags);
+ raw_spin_lock_irqsave(&desc->lock, flags);
/*
* There can be multiple actions per IRQ descriptor, find the right
if (!action) {
WARN(1, "Trying to free already-free IRQ %d\n", irq);
- spin_unlock_irqrestore(&desc->lock, flags);
+ raw_spin_unlock_irqrestore(&desc->lock, flags);
return NULL;
}
desc->chip->disable(irq);
}
- spin_unlock_irqrestore(&desc->lock, flags);
+ raw_spin_unlock_irqrestore(&desc->lock, flags);
unregister_handler_proc(irq, action);
kfree(action);
#ifdef CONFIG_DEBUG_SHIRQ
- if (irqflags & IRQF_SHARED) {
+ if (!retval && (irqflags & IRQF_SHARED)) {
/*
* It's a shared IRQ -- the driver ought to be prepared for it
* to happen immediately, so let's make sure....
return retval;
}
EXPORT_SYMBOL(request_threaded_irq);
+
+/**
+ * request_any_context_irq - allocate an interrupt line
+ * @irq: Interrupt line to allocate
+ * @handler: Function to be called when the IRQ occurs.
+ * Threaded handler for threaded interrupts.
+ * @flags: Interrupt type flags
+ * @name: An ascii name for the claiming device
+ * @dev_id: A cookie passed back to the handler function
+ *
+ * This call allocates interrupt resources and enables the
+ * interrupt line and IRQ handling. It selects either a
+ * hardirq or threaded handling method depending on the
+ * context.
+ *
+ * On failure, it returns a negative value. On success,
+ * it returns either IRQC_IS_HARDIRQ or IRQC_IS_NESTED.
+ */
+int request_any_context_irq(unsigned int irq, irq_handler_t handler,
+ unsigned long flags, const char *name, void *dev_id)
+{
+ struct irq_desc *desc = irq_to_desc(irq);
+ int ret;
+
+ if (!desc)
+ return -EINVAL;
+
+ if (desc->status & IRQ_NESTED_THREAD) {
+ ret = request_threaded_irq(irq, NULL, handler,
+ flags, name, dev_id);
+ return !ret ? IRQC_IS_NESTED : ret;
+ }
+
+ ret = request_irq(irq, handler, flags, name, dev_id);
+ return !ret ? IRQC_IS_HARDIRQ : ret;
+}
+EXPORT_SYMBOL_GPL(request_any_context_irq);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff