Merge tag 'irq-core-2026-08-17' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull generic interrupt subsystem updates from Thomas Gleixner:

 - Remove pointless NULL checks of the kstats_irqs field. That's a
   historical left over and not longer required.

 - Add Radu Rendec as reviewer. Radu thankfully stepped up to help
   reviewing the interrupt core and the related drivers code.

 - The usual small improvements and fixes

* tag 'irq-core-2026-08-17' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  MAINTAINERS: Add Radu Rendec as reviewer for the interrupt subsystem
  genirq/msi: Move misplaced EXPORT_SYMBOL_GPL for msi_domain_free_irqs_all()
  parisc: Remove unnecessary NULL check of the kstat_irqs field
  genirq: Remove unnecessary NULL check of the kstat_irqs field
  irqdomain: Remove unnedded NULL check in __irq_domain_[de]activate_irq()
  genirq/manage: Use irqd_get_parent_data() helper in __irq_get_irqchip_state()
  irqdomain: Plug leak in irq_domain_alloc_irqs_locked() error path

MAINTAINERS

@@ -13701,6 +13701,7 @@ F:	sound/soc/codecs/sma*
 
 IRQ DOMAINS (IRQ NUMBER MAPPING LIBRARY)
 M:	Thomas Gleixner <tglx@kernel.org>
+R:	Radu Rendec <radu@rendec.net>
 S:	Maintained
 P:	Documentation/process/maintainer-tip.rst
 T:	git git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git irq/core
@@ -13712,6 +13713,7 @@ F:	kernel/irq/msi.c
 
 IRQ SUBSYSTEM
 M:	Thomas Gleixner <tglx@kernel.org>
+R:	Radu Rendec <radu@rendec.net>
 L:	linux-kernel@vger.kernel.org
 S:	Maintained
 P:	Documentation/process/maintainer-tip.rst
@@ -13726,6 +13728,7 @@ F:	lib/group_cpus.c
 
 IRQCHIP DRIVERS
 M:	Thomas Gleixner <tglx@kernel.org>
+R:	Radu Rendec <radu@rendec.net>
 L:	linux-kernel@vger.kernel.org
 S:	Maintained
 P:	Documentation/process/maintainer-tip.rst

arch/parisc/kernel/smp.c

@@ -343,7 +343,7 @@ static int smp_boot_one_cpu(int cpuid, struct task_struct *idle)
 	for (i = 0; i < NR_IRQS; i++) {
 		struct irq_desc *desc = irq_to_desc(i);
 
-		if (desc && desc->kstat_irqs)
+		if (desc)
 			*per_cpu_ptr(desc->kstat_irqs, cpuid) = (struct irqstat) { };
 	}
 #endif

include/linux/irqdesc.h

@@ -146,7 +146,7 @@ extern struct irq_desc irq_desc[NR_IRQS];
 static inline unsigned int irq_desc_kstat_cpu(struct irq_desc *desc,
 					      unsigned int cpu)
 {
-	return desc->kstat_irqs ? per_cpu(desc->kstat_irqs->cnt, cpu) : 0;
+	return per_cpu(desc->kstat_irqs->cnt, cpu);
 }
 
 static inline struct irq_desc *irq_data_to_desc(struct irq_data *data)

kernel/irq/irqdesc.c

@@ -1004,7 +1004,7 @@ unsigned int kstat_irqs_cpu(unsigned int irq, int cpu)
 {
 	struct irq_desc *desc = irq_to_desc(irq);
 
-	return desc && desc->kstat_irqs ? per_cpu(desc->kstat_irqs->cnt, cpu) : 0;
+	return desc ? irq_desc_kstat_cpu(desc, cpu) : 0;
 }
 
 static unsigned int kstat_irqs_desc(struct irq_desc *desc, const struct cpumask *cpumask)
@@ -1026,7 +1026,7 @@ static unsigned int kstat_irqs(unsigned int irq)
 {
 	struct irq_desc *desc = irq_to_desc(irq);
 
-	if (!desc || !desc->kstat_irqs)
+	if (!desc)
 		return 0;
 	return kstat_irqs_desc(desc, cpu_possible_mask);
 }
@@ -1038,18 +1038,15 @@ void kstat_snapshot_irqs(void)
 	struct irq_desc *desc;
 	unsigned int irq;
 
-	for_each_irq_desc(irq, desc) {
-		if (!desc->kstat_irqs)
-			continue;
+	for_each_irq_desc(irq, desc)
 		this_cpu_write(desc->kstat_irqs->ref, this_cpu_read(desc->kstat_irqs->cnt));
-	}
 }
 
 unsigned int kstat_get_irq_since_snapshot(unsigned int irq)
 {
 	struct irq_desc *desc = irq_to_desc(irq);
 
-	if (!desc || !desc->kstat_irqs)
+	if (!desc)
 		return 0;
 	return this_cpu_read(desc->kstat_irqs->cnt) - this_cpu_read(desc->kstat_irqs->ref);
 }

kernel/irq/irqdomain.c

@@ -1658,7 +1658,7 @@ static int irq_domain_alloc_irqs_locked(struct irq_domain *domain, int irq_base,
 	for (i = 0; i < nr_irqs; i++) {
 		ret = irq_domain_trim_hierarchy(virq + i);
 		if (ret)
-			goto out_free_irq_data;
+			goto out_free_irqs;
 	}
 
 	for (i = 0; i < nr_irqs; i++)
@@ -1666,6 +1666,8 @@ static int irq_domain_alloc_irqs_locked(struct irq_domain *domain, int irq_base,
 
 	return virq;
 
+out_free_irqs:
+	irq_domain_free_irqs_hierarchy(domain, virq, nr_irqs);
 out_free_irq_data:
 	irq_domain_free_irq_data(virq, nr_irqs);
 out_free_desc:
@@ -1963,7 +1965,7 @@ EXPORT_SYMBOL_GPL(irq_domain_free_irqs_parent);
 
 static void __irq_domain_deactivate_irq(struct irq_data *irq_data)
 {
-	if (irq_data && irq_data->domain) {
+	if (irq_data->domain) {
 		struct irq_domain *domain = irq_data->domain;
 
 		if (domain->ops->deactivate)
@@ -1977,7 +1979,7 @@ static int __irq_domain_activate_irq(struct irq_data *irqd, bool reserve)
 {
 	int ret = 0;
 
-	if (irqd && irqd->domain) {
+	if (irqd->domain) {
 		struct irq_domain *domain = irqd->domain;
 
 		if (irqd->parent_data)

kernel/irq/manage.c

@@ -2703,11 +2703,7 @@ static int __irq_get_irqchip_state(struct irq_data *data, enum irqchip_irq_state
 			return -ENODEV;
 		if (chip->irq_get_irqchip_state)
 			break;
-#ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
-		data = data->parent_data;
-#else
-		data = NULL;
-#endif
+		data = irqd_get_parent_data(data);
 	} while (data);
 
 	if (data)

kernel/irq/msi.c

@@ -1683,7 +1683,6 @@ void msi_domain_free_irqs_range(struct device *dev, unsigned int domid,
 	guard(msi_descs_lock)(dev);
 	msi_domain_free_irqs_range_locked(dev, domid, first, last);
 }
-EXPORT_SYMBOL_GPL(msi_domain_free_irqs_all);
 
 /**
  * msi_domain_free_irqs_all_locked - Free all interrupts from a MSI interrupt domain
@@ -1714,6 +1713,7 @@ void msi_domain_free_irqs_all(struct device *dev, unsigned int domid)
 	guard(msi_descs_lock)(dev);
 	msi_domain_free_irqs_all_locked(dev, domid);
 }
+EXPORT_SYMBOL_GPL(msi_domain_free_irqs_all);
 
 /**
  * msi_device_domain_free_wired - Free a wired interrupt in @domain