soc: fsl: qe: qe_ports_ic: Consolidate chained IRQ handler install/remove

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 <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Christophe Leroy (CS GROUP) <[email protected]>

Author: Chen Ni

drivers/soc/fsl/qe/qe_ports_ic.c

@@ -114,8 +114,7 @@ static int qepic_probe(struct platform_device *pdev)
 	if (!data->host)
 		return -ENODEV;
 
-	irq_set_handler_data(irq, data);
-	irq_set_chained_handler(irq, qepic_cascade);
+	irq_set_chained_handler_and_data(irq, qepic_cascade, data);
 
 	return 0;
 }