genirq: revert lazy irq disable for simple irqs

rostedt · Ingo Molnar · commit 971e5b35fb02 · 2007-12-18T18:05:58.000+01:00
In commit 76d2160 lazy irq disabling was implemented, and the simple irq handler had a masking set to it. Remy Bohmer discovered that some devices in the ARM architecture would trigger the mask, but never unmask it. His patch to do the unmasking was questioned by Russell King about masking simple irqs to begin with. Looking further, it was discovered that the problems Remy was seeing was due to improper use of the simple handler by devices, and he later submitted patches to fix those. But the issue that was uncovered was that the simple handler should never mask. This patch reverts the masking in the simple handler. Signed-off-by: Steven Rostedt <srostedt@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c
@@ -297,18 +297,13 @@ handle_simple_irq(unsigned int irq, struct irq_desc *desc)
 
 	if (unlikely(desc->status & IRQ_INPROGRESS))
 		goto out_unlock;
+	desc->status &= ~(IRQ_REPLAY | IRQ_WAITING);
 	kstat_cpu(cpu).irqs[irq]++;
 
 	action = desc->action;
-	if (unlikely(!action || (desc->status & IRQ_DISABLED))) {
-		if (desc->chip->mask)
-			desc->chip->mask(irq);
-		desc->status &= ~(IRQ_REPLAY | IRQ_WAITING);
-		desc->status |= IRQ_PENDING;
+	if (unlikely(!action || (desc->status & IRQ_DISABLED)))
 		goto out_unlock;
-	}
 
-	desc->status &= ~(IRQ_REPLAY | IRQ_WAITING | IRQ_PENDING);
 	desc->status |= IRQ_INPROGRESS;
 	spin_unlock(&desc->lock);
 
