linux-kernel - [PATCH] genirq/PM: Always unlock IRQ descriptor in rearm_wake

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Message-Id: <20200811180001.80203-1-linux@roeck-us.net>
Date:   Tue, 11 Aug 2020 11:00:01 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     linux-kernel@...r.kernel.org, Guenter Roeck <linux@...ck-us.net>,
        "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>
Subject: [PATCH] genirq/PM: Always unlock IRQ descriptor in rearm_wake_irq

rearm_wake_irq() does not unlock the irq descriptor if the interrupt
is not suspended or if wakeup is not enabled on it. Fix it.

Fixes: 3a79bc63d9075 ("PCI: irq: Introduce rearm_wake_irq()")
Cc: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
Signed-off-by: Guenter Roeck <linux@...ck-us.net>
---
 kernel/irq/pm.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/kernel/irq/pm.c b/kernel/irq/pm.c
index 8f557fa1f4fe..c6c7e187ae74 100644
--- a/kernel/irq/pm.c
+++ b/kernel/irq/pm.c
@@ -185,14 +185,18 @@ void rearm_wake_irq(unsigned int irq)
 	unsigned long flags;
 	struct irq_desc *desc = irq_get_desc_buslock(irq, &flags, IRQ_GET_DESC_CHECK_GLOBAL);
 
-	if (!desc || !(desc->istate & IRQS_SUSPENDED) ||
-	    !irqd_is_wakeup_set(&desc->irq_data))
+	if (!desc)
 		return;
 
+	if (!(desc->istate & IRQS_SUSPENDED) ||
+	    !irqd_is_wakeup_set(&desc->irq_data))
+		goto unlock;
+
 	desc->istate &= ~IRQS_SUSPENDED;
 	irqd_set(&desc->irq_data, IRQD_WAKEUP_ARMED);
 	__enable_irq(desc);
 
+unlock:
 	irq_put_desc_busunlock(desc, flags);
 }
 
-- 
2.17.1