linux-kernel - [PATCH AUTOSEL 5.18 01/22] genirq: PM: Use runtime PM for chained interrupts

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Date:   Tue, 21 Jun 2022 16:49:07 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Marc Zyngier <maz@...nel.org>,
        Lucas Stach <l.stach@...gutronix.de>,
        Liu Ying <victor.liu@....com>, Sasha Levin <sashal@...nel.org>,
        tglx@...utronix.de
Subject: [PATCH AUTOSEL 5.18 01/22] genirq: PM: Use runtime PM for chained interrupts

From: Marc Zyngier <maz@...nel.org>

[ Upstream commit 668a9fe5c6a1bcac6b65d5e9b91a9eca86f782a3 ]

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@...gutronix.de>
Tested-by: Liu Ying <victor.liu@....com>
Signed-off-by: Marc Zyngier <maz@...nel.org>
Link: https://lore.kernel.org/r/26973cddee5f527ea17184c0f3fccb70bc8969a0.camel@pengutronix.de
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 kernel/irq/chip.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c
index 54af0deb239b..f2611f0f1224 100644
--- a/kernel/irq/chip.c
+++ b/kernel/irq/chip.c
@@ -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);
 	}
 }
-- 
2.35.1