[PATCH] powerpc/52xx/media5200: Consolidate chained IRQ handler install/remove

[Chen Ni]

The driver currently sets the handler data and the chained handler in
two separate steps. This creates a theoretical race window where an
interrupt could fire after the handler is set but before the data is
assigned, leading to a NULL pointer dereference.

Replace the two calls with irq_set_chained_handler_and_data() to set
both the handler and its data atomically under the irq_desc->lock.

Signed-off-by: Chen Ni <nichen at iscas.ac.cn>
---
 arch/powerpc/platforms/52xx/media5200.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/powerpc/platforms/52xx/media5200.c b/arch/powerpc/platforms/52xx/media5200.c
index bc7f83cfec1d..c20ac8010f6d 100644
--- a/arch/powerpc/platforms/52xx/media5200.c
+++ b/arch/powerpc/platforms/52xx/media5200.c
@@ -176,8 +176,8 @@ static void __init media5200_init_irq(void)
 
 	of_node_put(fpga_np);
 
-	irq_set_handler_data(cascade_virq, &media5200_irq);
-	irq_set_chained_handler(cascade_virq, media5200_irq_cascade);
+	irq_set_chained_handler_and_data(cascade_virq, media5200_irq_cascade,
+					 &media5200_irq);
 
 	return;
 
-- 
2.25.1