From: Johan Hovold johan+linaro@kernel.org
[ Upstream commit d55f7f4c58c07beb5050a834bf57ae2ede599c7e ]
Refactor __irq_domain_alloc_irqs() so that it can be called internally while holding the irq_domain_mutex.
This will be used to fix a shared-interrupt mapping race, hence the Fixes tag.
Fixes: b62b2cf5759b ("irqdomain: Fix handling of type settings for existing mappings") Cc: stable@vger.kernel.org # 4.8 Tested-by: Hsin-Yi Wang hsinyi@chromium.org Tested-by: Mark-PK Tsai mark-pk.tsai@mediatek.com Signed-off-by: Johan Hovold johan+linaro@kernel.org Signed-off-by: Marc Zyngier maz@kernel.org Link: https://lore.kernel.org/r/20230213104302.17307-6-johan+linaro@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Mark-PK Tsai mark-pk.tsai@mediatek.com --- kernel/irq/irqdomain.c | 74 ++++++++++++++++++++++++------------------ 1 file changed, 42 insertions(+), 32 deletions(-)
diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c index 8d85eeb0f078..1eb34eaeaa94 100644 --- a/kernel/irq/irqdomain.c +++ b/kernel/irq/irqdomain.c @@ -1350,6 +1350,45 @@ int irq_domain_alloc_irqs_hierarchy(struct irq_domain *domain, return domain->ops->alloc(domain, irq_base, nr_irqs, arg); }
+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) +{ + int i, ret, virq; + + if (realloc && irq_base >= 0) { + virq = irq_base; + } else { + virq = irq_domain_alloc_descs(irq_base, nr_irqs, 0, node, + affinity); + if (virq < 0) { + pr_debug("cannot allocate IRQ(base %d, count %d)\n", + irq_base, nr_irqs); + return virq; + } + } + + if (irq_domain_alloc_irq_data(domain, virq, nr_irqs)) { + pr_debug("cannot allocate memory for IRQ%d\n", virq); + ret = -ENOMEM; + goto out_free_desc; + } + + ret = irq_domain_alloc_irqs_hierarchy(domain, virq, nr_irqs, arg); + if (ret < 0) + goto out_free_irq_data; + for (i = 0; i < nr_irqs; i++) + irq_domain_insert_irq(virq + i); + + return virq; + +out_free_irq_data: + irq_domain_free_irq_data(virq, nr_irqs); +out_free_desc: + irq_free_descs(virq, nr_irqs); + return ret; +} + /** * __irq_domain_alloc_irqs - Allocate IRQs from domain * @domain: domain to allocate from @@ -1376,7 +1415,7 @@ int __irq_domain_alloc_irqs(struct irq_domain *domain, int irq_base, unsigned int nr_irqs, int node, void *arg, bool realloc, const struct irq_affinity_desc *affinity) { - int i, ret, virq; + int ret;
if (domain == NULL) { domain = irq_default_domain; @@ -1384,40 +1423,11 @@ int __irq_domain_alloc_irqs(struct irq_domain *domain, int irq_base, return -EINVAL; }
- if (realloc && irq_base >= 0) { - virq = irq_base; - } else { - virq = irq_domain_alloc_descs(irq_base, nr_irqs, 0, node, - affinity); - if (virq < 0) { - pr_debug("cannot allocate IRQ(base %d, count %d)\n", - irq_base, nr_irqs); - return virq; - } - } - - if (irq_domain_alloc_irq_data(domain, virq, nr_irqs)) { - pr_debug("cannot allocate memory for IRQ%d\n", virq); - ret = -ENOMEM; - goto out_free_desc; - } - mutex_lock(&irq_domain_mutex); - ret = irq_domain_alloc_irqs_hierarchy(domain, virq, nr_irqs, arg); - if (ret < 0) { - mutex_unlock(&irq_domain_mutex); - goto out_free_irq_data; - } - for (i = 0; i < nr_irqs; i++) - irq_domain_insert_irq(virq + i); + ret = irq_domain_alloc_irqs_locked(domain, irq_base, nr_irqs, node, arg, + realloc, affinity); mutex_unlock(&irq_domain_mutex);
- return virq; - -out_free_irq_data: - irq_domain_free_irq_data(virq, nr_irqs); -out_free_desc: - irq_free_descs(virq, nr_irqs); return ret; }