From 6d4affea7d5aa5ca5ff4c3e5fbf3ee16801cc527 Mon Sep 17 00:00:00 2001 From: Grygorii Strashko Date: Fri, 14 Aug 2015 15:20:25 +0300 Subject: [PATCH] genirq: Don't return ENOSYS in irq_chip_retrigger_hierarchy irq_chip_retrigger_hierarchy() returns -ENOSYS if it was not able to find at least one .irq_retrigger() callback implemented in the IRQ domain hierarchy. That's wrong, because check_irq_resend() expects a 0 return value from the callback in case that the hardware assisted resend was not possible. If the return value is non zero the core code assumes hardware resend success and the software resend is not invoked. This results in lost interrupts on platforms where none of the parent irq chips in the hierarchy implements the retrigger callback. This is observable on TI OMAP, where the hierarchy is: ARM GIC <- OMAP wakeupgen <- TI Crossbar Return 0 instead so the software resend mechanism gets invoked. [ tglx: Massaged changelog ] Fixes: 85f08c17de26 ('genirq: Introduce helper functions...') Signed-off-by: Grygorii Strashko Reviewed-by: Marc Zyngier Reviewed-by: Jiang Liu Cc: Sudeep Holla Cc: Cc: Cc: Cc: Cc: Cc: Cc: stable@vger.kernel.org # 4.1 Link: http://lkml.kernel.org/r/1439554830-19502-2-git-send-email-grygorii.strashko@ti.com Signed-off-by: Thomas Gleixner --- kernel/irq/chip.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c index 27f4332c7f84..6de638bccba7 100644 --- a/kernel/irq/chip.c +++ b/kernel/irq/chip.c @@ -997,7 +997,7 @@ int irq_chip_retrigger_hierarchy(struct irq_data *data) if (data->chip && data->chip->irq_retrigger) return data->chip->irq_retrigger(data); - return -ENOSYS; + return 0; } /** -- 2.20.1