From: Alexey Kardashevskiy <aik@ozlabs.ru>
To: linux-kernel@vger.kernel.org
Cc: "Cédric Le Goater" <clg@kaod.org>,
"Frederic Barrat" <fbarrat@linux.ibm.com>,
"Michal Suchánek" <msuchanek@suse.de>,
"Oliver O'Halloran" <oohall@gmail.com>,
"Marc Zyngier" <maz@kernel.org>,
"Thomas Gleixner" <tglx@linutronix.de>,
linux-arm-kernel@lists.infradead.org, linux-gpio@vger.kernel.org,
x86@kernel.org, linuxppc-dev@lists.ozlabs.org,
"Alexey Kardashevskiy" <aik@ozlabs.ru>
Subject: [PATCH kernel v4 7/8] genirq/irqdomain: Reference irq_desc for already mapped irqs
Date: Tue, 24 Nov 2020 17:17:19 +1100 [thread overview]
Message-ID: <20201124061720.86766-8-aik@ozlabs.ru> (raw)
In-Reply-To: <20201124061720.86766-1-aik@ozlabs.ru>
This references an irq_desc if already mapped interrupt requested to map
again. This happends for PCI legacy interrupts where 4 interrupts are
shared among all devices on the same PCI host bus adapter.
From now on, the users shall call irq_dispose_mapping() for every
irq_create_fwspec_mapping(). Most (all?) users do not bother with
disposing though so it is not very likely to break many things.
Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
---
kernel/irq/irqdomain.c | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)
diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c
index a0a81cc6c524..07f4bde87de5 100644
--- a/kernel/irq/irqdomain.c
+++ b/kernel/irq/irqdomain.c
@@ -663,7 +663,9 @@ unsigned int irq_create_mapping(struct irq_domain *domain,
/* Check if mapping already exists */
virq = irq_find_mapping(domain, hwirq);
if (virq) {
+ desc = irq_to_desc(virq);
pr_debug("-> existing mapping on virq %d\n", virq);
+ kobject_get(&desc->kobj);
return virq;
}
@@ -762,6 +764,7 @@ unsigned int irq_create_fwspec_mapping(struct irq_fwspec *fwspec)
irq_hw_number_t hwirq;
unsigned int type = IRQ_TYPE_NONE;
int virq;
+ struct irq_desc *desc;
if (fwspec->fwnode) {
domain = irq_find_matching_fwspec(fwspec, DOMAIN_BUS_WIRED);
@@ -798,8 +801,11 @@ unsigned int irq_create_fwspec_mapping(struct irq_fwspec *fwspec)
* current trigger type then we are done so return the
* interrupt number.
*/
- if (type == IRQ_TYPE_NONE || type == irq_get_trigger_type(virq))
+ if (type == IRQ_TYPE_NONE || type == irq_get_trigger_type(virq)) {
+ desc = irq_to_desc(virq);
+ kobject_get(&desc->kobj);
return virq;
+ }
/*
* If the trigger type has not been set yet, then set
@@ -811,6 +817,8 @@ unsigned int irq_create_fwspec_mapping(struct irq_fwspec *fwspec)
return 0;
irqd_set_trigger_type(irq_data, type);
+ desc = irq_to_desc(virq);
+ kobject_get(&desc->kobj);
return virq;
}
--
2.17.1
next prev parent reply other threads:[~2020-11-24 6:18 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-24 6:17 [PATCH kernel v4 0/8] genirq/irqdomain: Add reference counting to IRQs Alexey Kardashevskiy
2020-11-24 6:17 ` [PATCH kernel v4 1/8] genirq/ipi: Simplify irq_reserve_ipi Alexey Kardashevskiy
2020-11-24 16:54 ` Cédric Le Goater
2020-11-24 6:17 ` [PATCH kernel v4 2/8] genirq/irqdomain: Clean legacy IRQ allocation Alexey Kardashevskiy
2020-11-24 9:19 ` Andy Shevchenko
2020-11-24 10:56 ` Alexey Kardashevskiy
2020-11-30 21:41 ` Thomas Gleixner
2020-11-24 6:17 ` [PATCH kernel v4 3/8] genirq/irqdomain: Drop unused realloc parameter from __irq_domain_alloc_irqs Alexey Kardashevskiy
2020-11-24 6:17 ` [PATCH kernel v4 4/8] genirq: Free IRQ descriptor via embedded kobject Alexey Kardashevskiy
2020-11-24 6:17 ` [PATCH kernel v4 5/8] genirq: Add free_irq hook for IRQ descriptor and use for mapping disposal Alexey Kardashevskiy
2020-11-30 22:18 ` Thomas Gleixner
2020-11-30 22:33 ` Thomas Gleixner
2020-11-24 6:17 ` [PATCH kernel v4 6/8] genirq/irqdomain: Move hierarchical IRQ cleanup to kobject_release Alexey Kardashevskiy
2020-11-24 8:12 ` kernel test robot
2020-11-30 23:13 ` Thomas Gleixner
2020-11-24 6:17 ` Alexey Kardashevskiy [this message]
2020-11-24 6:17 ` [PATCH kernel v4 8/8] powerpc/pci: Remove LSI mappings on device teardown Alexey Kardashevskiy
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