From: Thomas Gleixner <[email protected]> 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 <[email protected]> Signed-off-by: Thomas Gleixner <[email protected]> Signed-off-by: Stefan Bader <[email protected]> --- 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 c49d6f5..4528f29 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 5fad88b..d40ecd5 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 a0bb09e..0067abb 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; - spin_lock_irqsave(&desc->lock, flags); __enable_irq(desc, irq, true); spin_unlock_irqrestore(&desc->lock, flags); -- 1.7.4.1 _______________________________________________ stable mailing list [email protected] http://linux.kernel.org/mailman/listinfo/stable
