[PATCH for-4.5 2/8] xen/arm: setup_dt_irq: don't enable the IRQ if the creation has failed

[Julien Grall <julien.grall@linaro.org>]

For now __setup_dt_irq can only fail if the action is already set. If in the
future, the function is updated we don't want to enable the IRQ.

Assuming the function can fail with action = NULL, when Xen will receive the
IRQ it will segfault because do_IRQ doesn't check if action is NULL.

Signed-off-by: Julien Grall <julien.grall@linaro.org>
---
 xen/arch/arm/gic.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/xen/arch/arm/gic.c b/xen/arch/arm/gic.c
index 1943f92..55e7622 100644
--- a/xen/arch/arm/gic.c
+++ b/xen/arch/arm/gic.c
@@ -608,8 +608,8 @@ int __init setup_dt_irq(const struct dt_irq *irq, struct irqaction *new)
     rc = __setup_irq(desc, irq->irq, new);
     spin_unlock_irqrestore(&desc->lock, flags);
 
-    desc->handler->startup(desc);
-
+    if ( !rc )
+        desc->handler->startup(desc);
 
     return rc;
 }
-- 
1.7.10.4