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authorRafael J. Wysocki <rafael.j.wysocki@intel.com>2014-07-10 23:37:54 +0200
committerThomas Gleixner <tglx@linutronix.de>2014-07-15 12:57:26 +0200
commitd709f7bcbb3ab01704fa7b37a2e4b981cf3783c1 (patch)
treefd952e3f4adbb790392a6ef3df06f1d4a2270459 /kernel/irq
parent4f808391df4ed5bea02519242710803df1ab040b (diff)
downloadlinux-d709f7bcbb3ab01704fa7b37a2e4b981cf3783c1.tar.bz2
PM / sleep / irq: Do not suspend wakeup interrupts
If an IRQ has been configured for wakeup via enable_irq_wake(), the driver who has done that must be prepared for receiving interrupts after suspend_device_irqs() has returned, so there is no need to "suspend" such IRQs. Moreover, if drivers using enable_irq_wake() actually want to receive interrupts after suspend_device_irqs() has returned, they need to add IRQF_NO_SUSPEND to the IRQ flags while requesting the IRQs, which shouldn't be necessary (it also goes a bit too far, as IRQF_NO_SUSPEND causes the IRQ to be ignored by suspend_device_irqs() all the time regardless of whether or not it has been configured for signaling wakeup). For the above reasons, make __disable_irq() ignore IRQ descriptors with IRQD_WAKEUP_STATE set when its suspend argument is true which effectively causes them to behave like IRQs with IRQF_NO_SUSPEND set. This also allows IRQs configured for wakeup via enable_irq_wake() to work as wakeup interrupts for the "freeze" (suspend-to-idle) sleep mode automatically just like for any other sleep states. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Cc: Li Aubrey <aubrey.li@linux.intel.com> Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com> Cc: One Thousand Gnomes <gnomes@lxorguk.ukuu.org.uk> Link: http://lkml.kernel.org/r/4679574.kGUnqAuNl9@vostro.rjw.lan Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'kernel/irq')
-rw-r--r--kernel/irq/manage.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index 3dc6a61bf06a..88657d7bc9dd 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -385,7 +385,8 @@ setup_affinity(unsigned int irq, struct irq_desc *desc, struct cpumask *mask)
void __disable_irq(struct irq_desc *desc, unsigned int irq, bool suspend)
{
if (suspend) {
- if (!desc->action || (desc->action->flags & IRQF_NO_SUSPEND))
+ if (!desc->action || (desc->action->flags & IRQF_NO_SUSPEND) ||
+ irqd_has_set(&desc->irq_data, IRQD_WAKEUP_STATE))
return;
desc->istate |= IRQS_SUSPENDED;
}