From: Marc Zyngier <maz@kernel.org>
To: linux-kernel@vger.kernel.org
Cc: Thomas Gleixner <tglx@linutronix.de>,
Jason Cooper <jason@lakedaemon.net>,
lorenzo.pieralisi@arm.com, Andrew.Murray@arm.com,
yuzenghui@huawei.com, Heyi Guo <guoheyi@huawei.com>
Subject: [PATCH v2 10/11] irqchip/irq-gic-v3-its: Lock VLPI map array before translating it
Date: Fri, 8 Nov 2019 16:58:04 +0000 [thread overview]
Message-ID: <20191108165805.3071-11-maz@kernel.org> (raw)
In-Reply-To: <20191108165805.3071-1-maz@kernel.org>
Obtaining the mapping ivformation for a VLPI should always be
done with the vlpi_lock for this device held. Otherwise, we
expose ourselves to races against a concurrent unmap.
Signed-off-by: Marc Zyngier <maz@kernel.org>
---
drivers/irqchip/irq-gic-v3-its.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c
index a83828e983ff..ae4acd13f97a 100644
--- a/drivers/irqchip/irq-gic-v3-its.c
+++ b/drivers/irqchip/irq-gic-v3-its.c
@@ -1489,12 +1489,14 @@ static int its_vlpi_map(struct irq_data *d, struct its_cmd_info *info)
static int its_vlpi_get(struct irq_data *d, struct its_cmd_info *info)
{
struct its_device *its_dev = irq_data_get_irq_chip_data(d);
- struct its_vlpi_map *map = get_vlpi_map(d);
+ struct its_vlpi_map *map;
int ret = 0;
mutex_lock(&its_dev->event_map.vlpi_lock);
- if (!its_dev->event_map.vm || !map->vm) {
+ map = get_vlpi_map(d);
+
+ if (!its_dev->event_map.vm || !map) {
ret = -EINVAL;
goto out;
}
--
2.20.1
next prev parent reply other threads:[~2019-11-08 17:02 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-08 16:57 [PATCH v2 00/11] irqchip/gic-v3-its: Cleanup and fixes for Linux 5.5 Marc Zyngier
2019-11-08 16:57 ` [PATCH v2 01/11] irqchip/gic-v3-its: Free collection mapping on device teardown Marc Zyngier
2019-11-09 8:26 ` Zenghui Yu
2019-11-20 13:21 ` [tip: irq/core] " tip-bot2 for Marc Zyngier
2019-11-08 16:57 ` [PATCH v2 02/11] irqchip/gic-v3-its: Factor out wait_for_syncr primitive Marc Zyngier
2019-11-08 16:57 ` [PATCH v2 03/11] irqchip/gic-v3-its: Allow LPI invalidation via the DirectLPI interface Marc Zyngier
2019-11-09 8:26 ` Zenghui Yu
2019-11-08 16:57 ` [PATCH v2 04/11] irqchip/gic-v3-its: Make is_v4 use a TYPER copy Marc Zyngier
2019-11-08 16:57 ` [PATCH v2 05/11] irqchip/gic-v3-its: Kill its->ite_size and use TYPER copy instead Marc Zyngier
2019-11-08 16:58 ` [PATCH v2 06/11] irqchip/gic-v3-its: Kill its->device_ids " Marc Zyngier
2019-11-08 16:58 ` [PATCH v2 07/11] irqchip/gic-v3-its: Add its_vlpi_map helpers Marc Zyngier
2019-11-10 14:46 ` Marc Zyngier
2019-11-08 16:58 ` [PATCH v2 08/11] irqchip/gic-v3-its: Synchronise INV command targetting a VLPI using VSYNC Marc Zyngier
2019-11-20 13:21 ` [tip: irq/core] " tip-bot2 for Marc Zyngier
2019-11-08 16:58 ` [PATCH v2 09/11] irqchip/gic-v3-its: Synchronise INT/CLEAR commands " Marc Zyngier
2019-11-20 13:21 ` [tip: irq/core] " tip-bot2 for Marc Zyngier
2019-11-08 16:58 ` Marc Zyngier [this message]
2019-11-20 13:21 ` [tip: irq/core] irqchip/gic-v3-its: Lock VLPI map array before translating it tip-bot2 for Marc Zyngier
2019-11-08 16:58 ` [PATCH v2 11/11] irqchip/gic-v3-its: Make vlpi_lock a spinlock Marc Zyngier
2019-11-20 13:21 ` [tip: irq/core] " tip-bot2 for Marc Zyngier
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