linux-kernel - [tip: irq/core] genirq/manage: Rework irq_set

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Message-ID: <174660884395.406.11099834875422739763.tip-bot2@tip-bot2>
Date: Wed, 07 May 2025 09:07:23 -0000
From: "tip-bot2 for Thomas Gleixner" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: Thomas Gleixner <tglx@...utronix.de>,
 "Peter Zijlstra (Intel)" <peterz@...radead.org>, x86@...nel.org,
 linux-kernel@...r.kernel.org, maz@...nel.org
Subject: [tip: irq/core] genirq/manage: Rework irq_set_parent()

The following commit has been merged into the irq/core branch of tip:

Commit-ID:     90140d08ac7a1e1ea3136132e1fab9baec174c25
Gitweb:        https://git.kernel.org/tip/90140d08ac7a1e1ea3136132e1fab9baec174c25
Author:        Thomas Gleixner <tglx@...utronix.de>
AuthorDate:    Tue, 29 Apr 2025 08:55:43 +02:00
Committer:     Thomas Gleixner <tglx@...utronix.de>
CommitterDate: Wed, 07 May 2025 09:08:15 +02:00

genirq/manage: Rework irq_set_parent()

Use the new guards to get and lock the interrupt descriptor and tidy up the
code.

No functional change.

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Acked-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Link: https://lore.kernel.org/all/20250429065422.258216558@linutronix.de


---
 kernel/irq/manage.c | 15 +++++----------
 1 file changed, 5 insertions(+), 10 deletions(-)

diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index b6f057a..a08bbad 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -959,16 +959,11 @@ int __irq_set_trigger(struct irq_desc *desc, unsigned long flags)
 #ifdef CONFIG_HARDIRQS_SW_RESEND
 int irq_set_parent(int irq, int parent_irq)
 {
-	unsigned long flags;
-	struct irq_desc *desc = irq_get_desc_lock(irq, &flags, 0);
-
-	if (!desc)
-		return -EINVAL;
-
-	desc->parent_irq = parent_irq;
-
-	irq_put_desc_unlock(desc, flags);
-	return 0;
+	scoped_irqdesc_get_and_lock(irq, 0) {
+		scoped_irqdesc->parent_irq = parent_irq;
+		return 0;
+	}
+	return -EINVAL;
 }
 EXPORT_SYMBOL_GPL(irq_set_parent);
 #endif