Hi,
This is regarding the following code in kernel/irq/handle.c. Consider the case
of a shared IRQ line, where two handlers are registered such that first handler
does not specify IRQF_DISABLED, but the second one does. But it seems both the
handlers will be called IRQs ENABLED (which is certainly not what the second
handler expects).
I also checked but could not find anything that stops me from registering two
shared ISRs - one with IRQF_DISABLED & another without this flag. Am I missing
something here?
irqreturn_t handle_IRQ_event(unsigned int irq, struct irqaction *action)
{
irqreturn_t ret, retval = IRQ_NONE;
unsigned int status = 0;
handle_dynamic_tick(action);
if (!(action->flags & IRQF_DISABLED))
local_irq_enable_in_hardirq();
do {
ret = action->handler(irq, action->dev_id);
if (ret == IRQ_HANDLED)
status |= action->flags;
retval |= ret;
action = action->next;
} while (action);
if (status & IRQF_SAMPLE_RANDOM)
add_interrupt_randomness(irq);
local_irq_disable();
return retval;
}
Thanks,
Rajat
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