| From b99113fef0b34efde93f59e851dbcf54324e992d Mon Sep 17 00:00:00 2001 |
| From: Thomas Gleixner <tglx@linutronix.de> |
| Date: Fri, 4 Feb 2011 13:19:20 +0100 |
| Subject: [PATCH] genirq: Add IRQF_FORCE_RESUME |
| |
| commit dc5f219e88294b93009eef946251251ffffb6d60 upstream. |
| |
| Xen needs to reenable interrupts which are marked IRQF_NO_SUSPEND in the |
| resume path. Add a flag to force the reenabling in the resume code. |
| |
| Tested-and-acked-by: Ian Campbell <Ian.Campbell@eu.citrix.com> |
| Signed-off-by: Thomas Gleixner <tglx@linutronix.de> |
| Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com> |
| --- |
| include/linux/interrupt.h | 3 ++- |
| kernel/irq/manage.c | 11 ++++++++++- |
| kernel/irq/pm.c | 3 --- |
| 3 files changed, 12 insertions(+), 5 deletions(-) |
| |
| diff --git a/include/linux/interrupt.h b/include/linux/interrupt.h |
| index 01db7a1..953ff1c 100644 |
| --- a/include/linux/interrupt.h |
| +++ b/include/linux/interrupt.h |
| @@ -53,7 +53,7 @@ |
| * Used by threaded interrupts which need to keep the |
| * irq line disabled until the threaded handler has been run. |
| * IRQF_NO_SUSPEND - Do not disable this IRQ during suspend |
| - * |
| + * IRQF_FORCE_RESUME - Force enable it on resume even if IRQF_NO_SUSPEND is set |
| */ |
| #define IRQF_DISABLED 0x00000020 |
| #define IRQF_SAMPLE_RANDOM 0x00000040 |
| @@ -65,6 +65,7 @@ |
| #define IRQF_IRQPOLL 0x00001000 |
| #define IRQF_ONESHOT 0x00002000 |
| #define IRQF_NO_SUSPEND 0x00004000 |
| +#define IRQF_FORCE_RESUME 0x00008000 |
| |
| #define IRQF_TIMER (__IRQF_TIMER | IRQF_NO_SUSPEND) |
| |
| diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c |
| index 8305828..46f10b1 100644 |
| --- a/kernel/irq/manage.c |
| +++ b/kernel/irq/manage.c |
| @@ -265,8 +265,17 @@ EXPORT_SYMBOL(disable_irq); |
| |
| void __enable_irq(struct irq_desc *desc, unsigned int irq, bool resume) |
| { |
| - if (resume) |
| + if (resume) { |
| + if (!(desc->status & IRQ_SUSPENDED)) { |
| + if (!desc->action) |
| + return; |
| + if (!(desc->action->flags & IRQF_FORCE_RESUME)) |
| + return; |
| + /* Pretend that it got disabled ! */ |
| + desc->depth++; |
| + } |
| desc->status &= ~IRQ_SUSPENDED; |
| + } |
| |
| switch (desc->depth) { |
| case 0: |
| diff --git a/kernel/irq/pm.c b/kernel/irq/pm.c |
| index 0d4005d8..d6bfb89 100644 |
| --- a/kernel/irq/pm.c |
| +++ b/kernel/irq/pm.c |
| @@ -53,9 +53,6 @@ void resume_device_irqs(void) |
| for_each_irq_desc(irq, desc) { |
| unsigned long flags; |
| |
| - if (!(desc->status & IRQ_SUSPENDED)) |
| - continue; |
| - |
| raw_spin_lock_irqsave(&desc->lock, flags); |
| __enable_irq(desc, irq, true); |
| raw_spin_unlock_irqrestore(&desc->lock, flags); |
| -- |
| 1.7.9.3 |
| |