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genirq: PM: Use runtime PM for chained interrupts 

When requesting an interrupt, we correctly call into the runtime
PM framework to guarantee that the underlying interrupt controller
is up and running.

However, we fail to do so for chained interrupt controllers, as
the mux interrupt is not requested along the same path.

Augment __irq_do_set_handler() to call into the runtime PM code
in this case, making sure the PM flow is the same for all interrupts.

Reported-by: Lucas Stach <l.stach@pengutronix.de>
Tested-by: Liu Ying <victor.liu@nxp.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/26973cddee5f527ea17184c0f3fccb70bc8969a0.camel@pengutronix.de
This commit is contained in:
Marc Zyngier 2022-06-08 14:45:35 +01:00
parent f2906aa863
commit 668a9fe5c6
1 changed files with 4 additions and 1 deletions
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5
kernel/irq/chip.c
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@ -1006,8 +1006,10 @@ __irq_do_set_handler(struct irq_desc *desc, irq_flow_handler_t handle,
if (desc->irq_data.chip != &no_irq_chip)
mask_ack_irq(desc);
irq_state_set_disabled(desc);
if (is_chained)
if (is_chained) {
desc->action = NULL;
WARN_ON(irq_chip_pm_put(irq_desc_get_irq_data(desc)));
}
desc->depth = 1;
}
desc->handle_irq = handle;
@ -1033,6 +1035,7 @@ __irq_do_set_handler(struct irq_desc *desc, irq_flow_handler_t handle,
irq_settings_set_norequest(desc);
irq_settings_set_nothread(desc);
desc->action = &chained_action;
WARN_ON(irq_chip_pm_get(irq_desc_get_irq_data(desc)));
irq_activate_and_startup(desc, IRQ_RESEND);
}
}