linux-kernel - [PATCH 4.19 30/84] genirq/msi: Ensure deactivation on teardown

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Date:   Tue, 24 Aug 2021 13:01:56 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Bixuan Cui <cuibixuan@...wei.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: [PATCH 4.19 30/84] genirq/msi: Ensure deactivation on teardown

From: Bixuan Cui <cuibixuan@...wei.com>

commit dbbc93576e03fbe24b365fab0e901eb442237a8a upstream.

msi_domain_alloc_irqs() invokes irq_domain_activate_irq(), but
msi_domain_free_irqs() does not enforce deactivation before tearing down
the interrupts.

This happens when PCI/MSI interrupts are set up and never used before being
torn down again, e.g. in error handling pathes. The only place which cleans
that up is the error handling path in msi_domain_alloc_irqs().

Move the cleanup from msi_domain_alloc_irqs() into msi_domain_free_irqs()
to cure that.

Fixes: f3b0946d629c ("genirq/msi: Make sure PCI MSIs are activated early")
Signed-off-by: Bixuan Cui <cuibixuan@...wei.com>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Cc: stable@...r.kernel.org
Link: https://lore.kernel.org/r/20210518033117.78104-1-cuibixuan@huawei.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 kernel/irq/msi.c | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/kernel/irq/msi.c b/kernel/irq/msi.c
index 604974f2afb1..88269dd5a8ca 100644
--- a/kernel/irq/msi.c
+++ b/kernel/irq/msi.c
@@ -477,11 +477,6 @@ skip_activate:
 	return 0;
 
 cleanup:
-	for_each_msi_vector(desc, i, dev) {
-		irq_data = irq_domain_get_irq_data(domain, i);
-		if (irqd_is_activated(irq_data))
-			irq_domain_deactivate_irq(irq_data);
-	}
 	msi_domain_free_irqs(domain, dev);
 	return ret;
 }
@@ -494,7 +489,15 @@ cleanup:
  */
 void msi_domain_free_irqs(struct irq_domain *domain, struct device *dev)
 {
+	struct irq_data *irq_data;
 	struct msi_desc *desc;
+	int i;
+
+	for_each_msi_vector(desc, i, dev) {
+		irq_data = irq_domain_get_irq_data(domain, i);
+		if (irqd_is_activated(irq_data))
+			irq_domain_deactivate_irq(irq_data);
+	}
 
 	for_each_msi_entry(desc, dev) {
 		/*
-- 
2.30.2