irq: Warn when shared interrupts do not match on NO_SUSPEND

When suspend_device_irqs() iterates all descriptors, its pointless if
one has NO_SUSPEND set while another has not.

Validate on request_irq() that NO_SUSPEND state maches for SHARED
interrupts.

Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Acked-by: "Rafael J. Wysocki" <rjw@rjwysocki.net>
Link: http://lkml.kernel.org/r/20140724133921.GY6758@twins.programming.kicks-ass.net
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index 88657d7..27a1fe0 100644 (file)
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -1077,9 +1077,12 @@ __setup_irq(unsigned int irq, struct irq_desc *desc, struct irqaction *new)
                 * set the trigger type must match. Also all must
                 * agree on ONESHOT.
                 */
+
+#define IRQF_MISMATCH \
+       (IRQF_TRIGGER_MASK | IRQF_ONESHOT | IRQF_NO_SUSPEND)
+
                if (!((old->flags & new->flags) & IRQF_SHARED) ||
-                   ((old->flags ^ new->flags) & IRQF_TRIGGER_MASK) ||
-                   ((old->flags ^ new->flags) & IRQF_ONESHOT))
+                   ((old->flags ^ new->flags) & IRQF_MISMATCH))
                        goto mismatch;
 
                /* All handlers must agree on per-cpuness */