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Message-Id: <20230209132323.4599-7-johan+linaro@kernel.org>
Date: Thu, 9 Feb 2023 14:23:10 +0100
From: Johan Hovold <johan+linaro@...nel.org>
To: Marc Zyngier <maz@...nel.org>, Thomas Gleixner <tglx@...utronix.de>
Cc: x86@...nel.org, platform-driver-x86@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, linux-mips@...r.kernel.org,
linux-kernel@...r.kernel.org,
Johan Hovold <johan+linaro@...nel.org>, stable@...r.kernel.org,
Dmitry Torokhov <dtor@...omium.org>,
Jon Hunter <jonathanh@...dia.com>,
Hsin-Yi Wang <hsinyi@...omium.org>,
Mark-PK Tsai <mark-pk.tsai@...iatek.com>
Subject: [PATCH v5 06/19] irqdomain: Fix mapping-creation race
Parallel probing of devices that share interrupts (e.g. when a driver
uses asynchronous probing) can currently result in two mappings for the
same hardware interrupt to be created due to missing serialisation.
Make sure to hold the irq_domain_mutex when creating mappings so that
looking for an existing mapping before creating a new one is done
atomically.
Fixes: 765230b5f084 ("driver-core: add asynchronous probing support for drivers")
Fixes: b62b2cf5759b ("irqdomain: Fix handling of type settings for existing mappings")
Link: https://lore.kernel.org/r/YuJXMHoT4ijUxnRb@hovoldconsulting.com
Cc: stable@...r.kernel.org # 4.8
Cc: Dmitry Torokhov <dtor@...omium.org>
Cc: Jon Hunter <jonathanh@...dia.com>
Tested-by: Hsin-Yi Wang <hsinyi@...omium.org>
Tested-by: Mark-PK Tsai <mark-pk.tsai@...iatek.com>
Signed-off-by: Johan Hovold <johan+linaro@...nel.org>
---
kernel/irq/irqdomain.c | 55 ++++++++++++++++++++++++++++++------------
1 file changed, 40 insertions(+), 15 deletions(-)
diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c
index 7b57949bc79c..1ddb01bd49a4 100644
--- a/kernel/irq/irqdomain.c
+++ b/kernel/irq/irqdomain.c
@@ -25,6 +25,9 @@ static DEFINE_MUTEX(irq_domain_mutex);
static struct irq_domain *irq_default_domain;
+static int irq_domain_alloc_irqs_locked(struct irq_domain *domain, int irq_base,
+ unsigned int nr_irqs, int node, void *arg,
+ bool realloc, const struct irq_affinity_desc *affinity);
static void irq_domain_check_hierarchy(struct irq_domain *domain);
struct irqchip_fwid {
@@ -682,9 +685,9 @@ unsigned int irq_create_direct_mapping(struct irq_domain *domain)
EXPORT_SYMBOL_GPL(irq_create_direct_mapping);
#endif
-static unsigned int __irq_create_mapping_affinity(struct irq_domain *domain,
- irq_hw_number_t hwirq,
- const struct irq_affinity_desc *affinity)
+static unsigned int irq_create_mapping_affinity_locked(struct irq_domain *domain,
+ irq_hw_number_t hwirq,
+ const struct irq_affinity_desc *affinity)
{
struct device_node *of_node = irq_domain_get_of_node(domain);
int virq;
@@ -699,7 +702,7 @@ static unsigned int __irq_create_mapping_affinity(struct irq_domain *domain,
return 0;
}
- if (irq_domain_associate(domain, virq, hwirq)) {
+ if (irq_domain_associate_locked(domain, virq, hwirq)) {
irq_free_desc(virq);
return 0;
}
@@ -735,14 +738,20 @@ unsigned int irq_create_mapping_affinity(struct irq_domain *domain,
return 0;
}
+ mutex_lock(&irq_domain_mutex);
+
/* Check if mapping already exists */
virq = irq_find_mapping(domain, hwirq);
if (virq) {
pr_debug("existing mapping on virq %d\n", virq);
- return virq;
+ goto out;
}
- return __irq_create_mapping_affinity(domain, hwirq, affinity);
+ virq = irq_create_mapping_affinity_locked(domain, hwirq, affinity);
+out:
+ mutex_unlock(&irq_domain_mutex);
+
+ return virq;
}
EXPORT_SYMBOL_GPL(irq_create_mapping_affinity);
@@ -809,6 +818,8 @@ unsigned int irq_create_fwspec_mapping(struct irq_fwspec *fwspec)
if (WARN_ON(type & ~IRQ_TYPE_SENSE_MASK))
type &= IRQ_TYPE_SENSE_MASK;
+ mutex_lock(&irq_domain_mutex);
+
/*
* If we've already configured this interrupt,
* don't do it again, or hell will break loose.
@@ -821,7 +832,7 @@ unsigned int irq_create_fwspec_mapping(struct irq_fwspec *fwspec)
* interrupt number.
*/
if (type == IRQ_TYPE_NONE || type == irq_get_trigger_type(virq))
- return virq;
+ goto out;
/*
* If the trigger type has not been set yet, then set
@@ -830,36 +841,43 @@ unsigned int irq_create_fwspec_mapping(struct irq_fwspec *fwspec)
if (irq_get_trigger_type(virq) == IRQ_TYPE_NONE) {
irq_data = irq_get_irq_data(virq);
if (!irq_data)
- return 0;
+ goto err;
irqd_set_trigger_type(irq_data, type);
- return virq;
+ goto out;
}
pr_warn("type mismatch, failed to map hwirq-%lu for %s!\n",
hwirq, of_node_full_name(to_of_node(fwspec->fwnode)));
- return 0;
+ goto err;
}
if (irq_domain_is_hierarchy(domain)) {
- virq = irq_domain_alloc_irqs(domain, 1, NUMA_NO_NODE, fwspec);
+ virq = irq_domain_alloc_irqs_locked(domain, -1, 1, NUMA_NO_NODE,
+ fwspec, false, NULL);
if (virq <= 0)
- return 0;
+ goto err;
} else {
/* Create mapping */
- virq = __irq_create_mapping_affinity(domain, hwirq, NULL);
+ virq = irq_create_mapping_affinity_locked(domain, hwirq, NULL);
if (!virq)
- return virq;
+ goto err;
}
irq_data = irq_get_irq_data(virq);
if (WARN_ON(!irq_data))
- return 0;
+ goto err;
/* Store trigger type */
irqd_set_trigger_type(irq_data, type);
+out:
+ mutex_unlock(&irq_domain_mutex);
return virq;
+err:
+ mutex_unlock(&irq_domain_mutex);
+
+ return 0;
}
EXPORT_SYMBOL_GPL(irq_create_fwspec_mapping);
@@ -1888,6 +1906,13 @@ void irq_domain_set_info(struct irq_domain *domain, unsigned int virq,
irq_set_handler_data(virq, handler_data);
}
+static int irq_domain_alloc_irqs_locked(struct irq_domain *domain, int irq_base,
+ unsigned int nr_irqs, int node, void *arg,
+ bool realloc, const struct irq_affinity_desc *affinity)
+{
+ return -EINVAL;
+}
+
static void irq_domain_check_hierarchy(struct irq_domain *domain)
{
}
--
2.39.1
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