irqchip/stm32-exti: Fix irq_mask/irq_unmask for direct events

The driver has to mask/unmask the corresponding flag in the
Interrupt Mask Register (IMR).
This is already done for configurable event, while direct events
only forward the mask/unmask request to the parent.

Use the existing stm32_exti_h_mask()/stm32_exti_h_unmask() for
direct events too.
Signed-off-by: Loic Pallardy <loic.pallardy@foss.st.com>
Signed-off-by: Antonio Borneo <antonio.borneo@foss.st.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20220606162757.415354-3-antonio.borneo@foss.st.com

drivers/irqchip/irq-stm32-exti.c

@@ -691,8 +691,8 @@ static struct irq_chip stm32_exti_h_chip_direct = {
 	.name			= "stm32-exti-h-direct",
 	.irq_eoi		= irq_chip_eoi_parent,
 	.irq_ack		= irq_chip_ack_parent,
-	.irq_mask		= irq_chip_mask_parent,
-	.irq_unmask		= irq_chip_unmask_parent,
+	.irq_mask		= stm32_exti_h_mask,
+	.irq_unmask		= stm32_exti_h_unmask,
 	.irq_retrigger		= irq_chip_retrigger_hierarchy,
 	.irq_set_type		= irq_chip_set_type_parent,
 	.irq_set_wake		= stm32_exti_h_set_wake,