From f9f21cea311340f38074ff93a8d89b4a9cae6bcc Mon Sep 17 00:00:00 2001 From: Stephen Boyd Date: Thu, 6 Feb 2020 11:15:21 -0800 Subject: genirq: Clarify that irq wake state is orthogonal to enable/disable There's some confusion around if an irq that's disabled with disable_irq() can still wake the system from sleep states such as "suspend to RAM". Clarify this in the kernel documentation for irq_set_irq_wake() so that it's clear that an irq can be disabled and still wake the system if it has been marked for wakeup. Signed-off-by: Stephen Boyd Signed-off-by: Thomas Gleixner Reviewed-by: Douglas Anderson Link: https://lkml.kernel.org/r/20200206191521.94559-1-swboyd@chromium.org --- kernel/irq/manage.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c index 818b2802d3e7..3089a60ea8f9 100644 --- a/kernel/irq/manage.c +++ b/kernel/irq/manage.c @@ -731,6 +731,13 @@ static int set_irq_wake_real(unsigned int irq, unsigned int on) * * Wakeup mode lets this IRQ wake the system from sleep * states like "suspend to RAM". + * + * Note: irq enable/disable state is completely orthogonal + * to the enable/disable state of irq wake. An irq can be + * disabled with disable_irq() and still wake the system as + * long as the irq has wake enabled. If this does not hold, + * then the underlying irq chip and the related driver need + * to be investigated. */ int irq_set_irq_wake(unsigned int irq, unsigned int on) { -- cgit