linux-kernel - [patch 3/4] genirq: Split up irq_pm_check

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Message-ID: <20250718185312.012392426@linutronix.de>
Date: Fri, 18 Jul 2025 20:54:10 +0200 (CEST)
From: Thomas Gleixner <tglx@...utronix.de>
To: LKML <linux-kernel@...r.kernel.org>
Cc: Liangyan <liangyan.peng@...edance.com>,
 Yicong Shen <shenyicong.1023@...edance.com>,
 Jiri Slaby <jirislaby@...nel.org>
Subject: [patch 3/4] genirq: Split up irq_pm_check_wakeup()

Let the calling code check for the IRQD_WAKEUP_ARMED flag to prepare for a
live lock mitigation in the edge type handler.

No functional change.

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
---
 kernel/irq/chip.c      |    4 +++-
 kernel/irq/internals.h |    4 ++--
 kernel/irq/pm.c        |   16 ++++++----------
 3 files changed, 11 insertions(+), 13 deletions(-)

--- a/kernel/irq/chip.c
+++ b/kernel/irq/chip.c
@@ -478,8 +478,10 @@ static bool irq_can_handle_pm(struct irq
 	 * and suspended, disable it and notify the pm core about the
 	 * event.
 	 */
-	if (irq_pm_check_wakeup(desc))
+	if (unlikely(irqd_has_set(irqd, IRQD_WAKEUP_ARMED))) {
+		irq_pm_handle_wakeup(desc);
 		return false;
+	}
 
 	/* Check whether the interrupt is polled on another CPU */
 	if (unlikely(desc->istate & IRQS_POLL_INPROGRESS)) {
--- a/kernel/irq/internals.h
+++ b/kernel/irq/internals.h
@@ -277,11 +277,11 @@ static inline bool irq_is_nmi(struct irq
 }
 
 #ifdef CONFIG_PM_SLEEP
-bool irq_pm_check_wakeup(struct irq_desc *desc);
+void irq_pm_handle_wakeup(struct irq_desc *desc);
 void irq_pm_install_action(struct irq_desc *desc, struct irqaction *action);
 void irq_pm_remove_action(struct irq_desc *desc, struct irqaction *action);
 #else
-static inline bool irq_pm_check_wakeup(struct irq_desc *desc) { return false; }
+static inline void irq_pm_handle_wakeup(struct irq_desc *desc) { }
 static inline void
 irq_pm_install_action(struct irq_desc *desc, struct irqaction *action) { }
 static inline void
--- a/kernel/irq/pm.c
+++ b/kernel/irq/pm.c
@@ -13,17 +13,13 @@
 
 #include "internals.h"
 
-bool irq_pm_check_wakeup(struct irq_desc *desc)
+void irq_pm_handle_wakeup(struct irq_desc *desc)
 {
-	if (irqd_is_wakeup_armed(&desc->irq_data)) {
-		irqd_clear(&desc->irq_data, IRQD_WAKEUP_ARMED);
-		desc->istate |= IRQS_SUSPENDED | IRQS_PENDING;
-		desc->depth++;
-		irq_disable(desc);
-		pm_system_irq_wakeup(irq_desc_get_irq(desc));
-		return true;
-	}
-	return false;
+	irqd_clear(&desc->irq_data, IRQD_WAKEUP_ARMED);
+	desc->istate |= IRQS_SUSPENDED | IRQS_PENDING;
+	desc->depth++;
+	irq_disable(desc);
+	pm_system_irq_wakeup(irq_desc_get_irq(desc));
 }
 
 /*