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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@iscas.ac.cn> Link: https://lore.kernel.org/r/20260119055715.889001-1-nichen@iscas.ac.cn Signed-off-by: Christophe Leroy (CS GROUP) <chleroy@kernel.org>