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Message-ID: <87k0rwdegz.fsf@nanos.tec.linutronix.de> Date: Thu, 28 Jan 2021 20:54:36 +0100 From: Thomas Gleixner <tglx@...utronix.de> To: Barry Song <song.bao.hua@...ilicon.com>, dmitry.torokhov@...il.com, maz@...nel.org, gregkh@...uxfoundation.org, linux-input@...r.kernel.org, linux-kernel@...r.kernel.org Cc: linuxarm@...neuler.org, Barry Song <song.bao.hua@...ilicon.com> Subject: Re: [PATCH v3 01/12] genirq: add IRQF_NO_AUTOEN for request_irq Barry, On Fri, Jan 08 2021 at 11:39, Barry Song wrote: > diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c > index ab8567f32501..2b28314e2572 100644 > --- a/kernel/irq/manage.c > +++ b/kernel/irq/manage.c > @@ -1693,6 +1693,9 @@ __setup_irq(unsigned int irq, struct irq_desc *desc, struct irqaction *new) > irqd_set(&desc->irq_data, IRQD_NO_BALANCING); > } > > + if (new->flags & IRQF_NO_AUTOEN) > + irq_settings_set_noautoen(desc); If we move this to request time flags, then setting the noautoen bit on the irq descriptor is pretty pointless. See below. I rather get rid of the irq_settings magic for NOAUTOEN completely. Thanks, tglx --- --- a/include/linux/interrupt.h +++ b/include/linux/interrupt.h @@ -61,6 +61,8 @@ * 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 automatically when users request it. Users + * will enable it explicitly by enable_irq() later. */ #define IRQF_SHARED 0x00000080 #define IRQF_PROBE_SHARED 0x00000100 @@ -74,6 +76,7 @@ #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) --- a/kernel/irq/manage.c +++ b/kernel/irq/manage.c @@ -1693,7 +1693,8 @@ static int 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 { /* @@ -2086,10 +2087,15 @@ int request_threaded_irq(unsigned int ir * 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;
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