linux-kernel - [PATCH v2 RESEND 3/3] irqchip/gic-v5: Fix error handling in gicv5_its_irq_domain

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Message-ID: <20250908082745.113718-4-lpieralisi@kernel.org>
Date: Mon,  8 Sep 2025 10:27:45 +0200
From: Lorenzo Pieralisi <lpieralisi@...nel.org>
To: linux-kernel@...r.kernel.org
Cc: linux-arm-kernel@...ts.infradead.org,
	Dan Carpenter <dan.carpenter@...aro.org>,
	Zenghui Yu <yuzenghui@...wei.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Marc Zyngier <maz@...nel.org>
Subject: [PATCH v2 RESEND 3/3] irqchip/gic-v5: Fix error handling in gicv5_its_irq_domain_alloc()

From: Dan Carpenter <dan.carpenter@...aro.org>

Code in gicv5_its_irq_domain_alloc() has two issues:

- it checks the wrong return value/variable when calling gicv5_alloc_lpi()
- The cleanup code does not take previous loop iterations into account

Fix both issues at once by adding the right gicv5_alloc_lpi() variable
check and by reworking the function cleanup code to take into account
current and previous iterations.

[lpieralisi: reworded commit log]

Fixes: 57d72196dfc8 ("irqchip/gic-v5: Add GICv5 ITS support")
Signed-off-by: Dan Carpenter <dan.carpenter@...aro.org>
Signed-off-by: Lorenzo Pieralisi <lpieralisi@...nel.org>
Reviewed-by: Zenghui Yu <yuzenghui@...wei.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Marc Zyngier <maz@...nel.org>
---
 drivers/irqchip/irq-gic-v5-its.c | 20 ++++++++++++++------
 1 file changed, 14 insertions(+), 6 deletions(-)

diff --git a/drivers/irqchip/irq-gic-v5-its.c b/drivers/irqchip/irq-gic-v5-its.c
index 4701ef62b8b2..2fb58d76f521 100644
--- a/drivers/irqchip/irq-gic-v5-its.c
+++ b/drivers/irqchip/irq-gic-v5-its.c
@@ -949,15 +949,18 @@ static int gicv5_its_irq_domain_alloc(struct irq_domain *domain, unsigned int vi
 	device_id = its_dev->device_id;
 
 	for (i = 0; i < nr_irqs; i++) {
-		lpi = gicv5_alloc_lpi();
+		ret = gicv5_alloc_lpi();
 		if (ret < 0) {
 			pr_debug("Failed to find free LPI!\n");
-			goto out_eventid;
+			goto out_free_irqs;
 		}
+		lpi = ret;
 
 		ret = irq_domain_alloc_irqs_parent(domain, virq + i, 1, &lpi);
-		if (ret)
-			goto out_free_lpi;
+		if (ret) {
+			gicv5_free_lpi(lpi);
+			goto out_free_irqs;
+		}
 
 		/*
 		 * Store eventid and deviceid into the hwirq for later use.
@@ -977,8 +980,13 @@ static int gicv5_its_irq_domain_alloc(struct irq_domain *domain, unsigned int vi
 
 	return 0;
 
-out_free_lpi:
-	gicv5_free_lpi(lpi);
+out_free_irqs:
+	while (--i >= 0) {
+		irqd = irq_domain_get_irq_data(domain, virq + i);
+		gicv5_free_lpi(irqd->parent_data->hwirq);
+		irq_domain_reset_irq_data(irqd);
+		irq_domain_free_irqs_parent(domain, virq + i, 1);
+	}
 out_eventid:
 	gicv5_its_free_eventid(its_dev, event_id_base, nr_irqs);
 	return ret;
-- 
2.48.0