Once interrupt is shared all actions co-related to given interrupt need to have IRQF_HIGH_PRIORITY flag which means that actions have the same priority.
Signed-off-by: Tomasz Nowicki tomasz.nowicki@linaro.org --- include/linux/interrupt.h | 1 + kernel/irq/manage.c | 12 ++++++++++-- 2 files changed, 11 insertions(+), 2 deletions(-)
diff --git a/include/linux/interrupt.h b/include/linux/interrupt.h index 5fa5afe..a566e54 100644 --- a/include/linux/interrupt.h +++ b/include/linux/interrupt.h @@ -71,6 +71,7 @@ #define IRQF_FORCE_RESUME 0x00008000 #define IRQF_NO_THREAD 0x00010000 #define IRQF_EARLY_RESUME 0x00020000 +#define IRQF_HIGH_PRIORITY 0x00040000
#define IRQF_TIMER (__IRQF_TIMER | IRQF_NO_SUSPEND | IRQF_NO_THREAD)
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c index 514bcfd..ea885e6 100644 --- a/kernel/irq/manage.c +++ b/kernel/irq/manage.c @@ -14,6 +14,7 @@ #include <linux/module.h> #include <linux/random.h> #include <linux/interrupt.h> +#include <linux/irqpriority.h> #include <linux/slab.h> #include <linux/sched.h> #include <linux/sched/rt.h> @@ -1006,11 +1007,12 @@ __setup_irq(unsigned int irq, struct irq_desc *desc, struct irqaction *new) * the same type (level, edge, polarity). So both flag * fields must have IRQF_SHARED set and the bits which * set the trigger type must match. Also all must - * agree on ONESHOT. + * agree on ONESHOT and IRQF_HIGH_PRIORITY. */ if (!((old->flags & new->flags) & IRQF_SHARED) || ((old->flags ^ new->flags) & IRQF_TRIGGER_MASK) || - ((old->flags ^ new->flags) & IRQF_ONESHOT)) + ((old->flags ^ new->flags) & IRQF_ONESHOT) || + ((old->flags ^ new->flags) & IRQF_HIGH_PRIORITY)) goto mismatch;
/* All handlers must agree on per-cpuness */ @@ -1115,6 +1117,12 @@ __setup_irq(unsigned int irq, struct irq_desc *desc, struct irqaction *new) if (new->flags & IRQF_ONESHOT) desc->istate |= IRQS_ONESHOT;
+ if (new->flags & IRQF_HIGH_PRIORITY) { + ret = irq_set_priority(desc, IRQP_HIGH); + if (ret) + goto out_mask; + } + if (irq_settings_can_autoenable(desc)) irq_startup(desc, true); else