[SPARC64]: Let irq_install_pre_handler() get called multiple times.

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 4 insertions, 0 deletions

diff --git a/arch/sparc64/kernel/irq.c b/arch/sparc64/kernel/irq.c
index ab9e640df228..eebe02f3f4cb 100644
--- a/arch/sparc64/kernel/irq.c
+++ b/arch/sparc64/kernel/irq.c
@@ -414,6 +414,10 @@ void irq_install_pre_handler(int virt_irq,
         data->pre_handler_arg1 = arg1;
         data->pre_handler_arg2 = arg2;
 
+        if (desc->chip == &sun4u_irq_ack ||
+            desc->chip == &sun4v_irq_ack)
+                return;
+
         desc->chip = (desc->chip == &sun4u_irq ?
                       &sun4u_irq_ack : &sun4v_irq_ack);
 }