irqdomain: Avoid activating interrupts more than once

Since commit f3b0946d629c ("genirq/msi: Make sure PCI MSIs are
activated early"), we can end-up activating a PCI/MSI twice (once
at allocation time, and once at startup time).

This is normally of no consequences, except that there is some
HW out there that may misbehave if activate is used more than once
(the GICv3 ITS, for example, uses the activate callback
to issue the MAPVI command, and the architecture spec says that
"If there is an existing mapping for the EventID-DeviceID
combination, behavior is UNPREDICTABLE").

While this could be worked around in each individual driver, it may
make more sense to tackle the issue at the core level. In order to
avoid getting in that situation, let's have a per-interrupt flag
to remember if we have already activated that interrupt or not.

Fixes: f3b0946d629c ("genirq/msi: Make sure PCI MSIs are activated early")
Reported-and-tested-by: Andre Przywara <andre.przywara@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Cc: stable@vger.kernel.org
Link: http://lkml.kernel.org/r/1484668848-24361-1-git-send-email-marc.zyngier@arm.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 30 insertions, 14 deletions

diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c
index 8c0a0ae43521..b59e6768c5e9 100644
--- a/kernel/irq/irqdomain.c
+++ b/kernel/irq/irqdomain.c
@@ -1346,6 +1346,30 @@ void irq_domain_free_irqs_parent(struct irq_domain *domain,
 }
 EXPORT_SYMBOL_GPL(irq_domain_free_irqs_parent);
 
+static void __irq_domain_activate_irq(struct irq_data *irq_data)
+{
+        if (irq_data && irq_data->domain) {
+                struct irq_domain *domain = irq_data->domain;
+
+                if (irq_data->parent_data)
+                        __irq_domain_activate_irq(irq_data->parent_data);
+                if (domain->ops->activate)
+                        domain->ops->activate(domain, irq_data);
+        }
+}
+
+static void __irq_domain_deactivate_irq(struct irq_data *irq_data)
+{
+        if (irq_data && irq_data->domain) {
+                struct irq_domain *domain = irq_data->domain;
+
+                if (domain->ops->deactivate)
+                        domain->ops->deactivate(domain, irq_data);
+                if (irq_data->parent_data)
+                        __irq_domain_deactivate_irq(irq_data->parent_data);
+        }
+}
+
 /**
  * irq_domain_activate_irq - Call domain_ops->activate recursively to activate
  *                           interrupt
@@ -1356,13 +1380,9 @@ EXPORT_SYMBOL_GPL(irq_domain_free_irqs_parent);
  */
 void irq_domain_activate_irq(struct irq_data *irq_data)
 {
-        if (irq_data && irq_data->domain) {
-                struct irq_domain *domain = irq_data->domain;
-
-                if (irq_data->parent_data)
-                        irq_domain_activate_irq(irq_data->parent_data);
-                if (domain->ops->activate)
-                        domain->ops->activate(domain, irq_data);
+        if (!irqd_is_activated(irq_data)) {
+                __irq_domain_activate_irq(irq_data);
+                irqd_set_activated(irq_data);
         }
 }
 
@@ -1376,13 +1396,9 @@ void irq_domain_activate_irq(struct irq_data *irq_data)
  */
 void irq_domain_deactivate_irq(struct irq_data *irq_data)
 {
-        if (irq_data && irq_data->domain) {
-                struct irq_domain *domain = irq_data->domain;
-
-                if (domain->ops->deactivate)
-                        domain->ops->deactivate(domain, irq_data);
-                if (irq_data->parent_data)
-                        irq_domain_deactivate_irq(irq_data->parent_data);
+        if (irqd_is_activated(irq_data)) {
+                __irq_domain_deactivate_irq(irq_data);
+                irqd_clr_activated(irq_data);
         }
 }