linux-kernel - [tip: irq/core] irqchip/gic-v3-its: Free collection mapping on device teardown

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Date:   Wed, 20 Nov 2019 13:21:05 -0000
From:   "tip-bot2 for Marc Zyngier" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Marc Zyngier <maz@...nel.org>, Zenghui Yu <yuzenghui@...wei.com>,
        Ingo Molnar <mingo@...nel.org>, Borislav Petkov <bp@...en8.de>,
        linux-kernel@...r.kernel.org
Subject: [tip: irq/core] irqchip/gic-v3-its: Free collection mapping on device
 teardown

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

Commit-ID:     898aa5ce6158c5ccfc256bfc17963bc81981eef8
Gitweb:        https://git.kernel.org/tip/898aa5ce6158c5ccfc256bfc17963bc81981eef8
Author:        Marc Zyngier <maz@...nel.org>
AuthorDate:    Fri, 08 Nov 2019 16:57:55 
Committer:     Marc Zyngier <maz@...nel.org>
CommitterDate: Sun, 10 Nov 2019 18:47:50 

irqchip/gic-v3-its: Free collection mapping on device teardown

We allocate the collection mapping on device creation, but somehow
free it on the irqdomain free path, which is pretty inconsistent
and has led to bugs in the past.

Move it to the point where we teardown the device, making the
alloc/free symetric.

Signed-off-by: Marc Zyngier <maz@...nel.org>
Reviewed-by: Zenghui Yu <yuzenghui@...wei.com>
Link: https://lore.kernel.org/r/20191108165805.3071-2-maz@kernel.org
---
 drivers/irqchip/irq-gic-v3-its.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c
index 021e0c7..d5d8f8f 100644
--- a/drivers/irqchip/irq-gic-v3-its.c
+++ b/drivers/irqchip/irq-gic-v3-its.c
@@ -2474,6 +2474,7 @@ static void its_free_device(struct its_device *its_dev)
 	raw_spin_lock_irqsave(&its_dev->its->lock, flags);
 	list_del(&its_dev->entry);
 	raw_spin_unlock_irqrestore(&its_dev->its->lock, flags);
+	kfree(its_dev->event_map.col_map);
 	kfree(its_dev->itt);
 	kfree(its_dev);
 }
@@ -2682,7 +2683,6 @@ static void its_irq_domain_free(struct irq_domain *domain, unsigned int virq,
 		its_lpi_free(its_dev->event_map.lpi_map,
 			     its_dev->event_map.lpi_base,
 			     its_dev->event_map.nr_lpis);
-		kfree(its_dev->event_map.col_map);
 
 		/* Unmap device/itt */
 		its_send_mapd(its_dev, 0);