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Merge tag 'irq-no-autoen-2021-03-25' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip into next

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Sync up with the tip tree to pick up IRQF_NO_AUTOEN.
This commit is contained in:
Dmitry Torokhov
2021-03-25 11:47:05 -07:00
parent 5acac83bf2 cbe16f35be
commit 73cdf82a3d
2 changed files with 13 additions and 2 deletions
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4
include/linux/interrupt.h
View File

@@ -61,6 +61,9 @@
* interrupt handler after suspending interrupts. For system
* wakeup devices users need to implement wakeup detection in
* their interrupt handlers.
* IRQF_NO_AUTOEN - Don't enable IRQ or NMI automatically when users request it.
* Users will enable it explicitly by enable_irq() or enable_nmi()
* later.
*/
#define IRQF_SHARED 0x00000080
#define IRQF_PROBE_SHARED 0x00000100
@@ -74,6 +77,7 @@
#define IRQF_NO_THREAD 0x00010000
#define IRQF_EARLY_RESUME 0x00020000
#define IRQF_COND_SUSPEND 0x00040000
#define IRQF_NO_AUTOEN 0x00080000
#define IRQF_TIMER (__IRQF_TIMER | IRQF_NO_SUSPEND | IRQF_NO_THREAD)

11
kernel/irq/manage.c
View File

@@ -1697,7 +1697,8 @@ __setup_irq(unsigned int irq, struct irq_desc *desc, struct irqaction *new)
irqd_set(&desc->irq_data, IRQD_NO_BALANCING);
}
if (irq_settings_can_autoenable(desc)) {
if (!(new->flags & IRQF_NO_AUTOEN) &&
irq_settings_can_autoenable(desc)) {
irq_startup(desc, IRQ_RESEND, IRQ_START_COND);
} else {
/*
@@ -2090,10 +2091,15 @@ int request_threaded_irq(unsigned int irq, irq_handler_t handler,
* which interrupt is which (messes up the interrupt freeing
* logic etc).
*
* Also shared interrupts do not go well with disabling auto enable.
* The sharing interrupt might request it while it's still disabled
* and then wait for interrupts forever.
*
* Also IRQF_COND_SUSPEND only makes sense for shared interrupts and
* it cannot be set along with IRQF_NO_SUSPEND.
*/
if (((irqflags & IRQF_SHARED) && !dev_id) ||
((irqflags & IRQF_SHARED) && (irqflags & IRQF_NO_AUTOEN)) ||
(!(irqflags & IRQF_SHARED) && (irqflags & IRQF_COND_SUSPEND)) ||
((irqflags & IRQF_NO_SUSPEND) && (irqflags & IRQF_COND_SUSPEND)))
return -EINVAL;
@@ -2249,7 +2255,8 @@ int request_nmi(unsigned int irq, irq_handler_t handler,
desc = irq_to_desc(irq);
if (!desc || irq_settings_can_autoenable(desc) ||
if (!desc || (irq_settings_can_autoenable(desc) &&
!(irqflags & IRQF_NO_AUTOEN)) ||
!irq_settings_can_request(desc) ||
WARN_ON(irq_settings_is_per_cpu_devid(desc)) ||
!irq_supports_nmi(desc))