* David Brownell <david-b@xxxxxxxxxxx> [081007 06:43]: > From: David Brownell <dbrownell@xxxxxxxxxxxxxxxxxxxxx> > > Simplify twl4030 IRQ handling by removing a needless custom flow > handler. The top level IRQs, from the PIH, are well suited for > handle_simple_irq() ... they can't be acked or masked. > > Switching resolves some issues with how IRQs were dispatched. > Notably, abuse of desc->status, IRQ accounting, and handling > of various faults. > > In short, use standard genirq code. > > Drivers that request_irq() to the PIH will need to pay more > attention to things like setting IRQF_DISABLED (since it's > no longer ignored), and making I2C calls from handlers (you'll > need a lockdep workaround). Pushed. Tony > Signed-off-by: David Brownell <dbrownell@xxxxxxxxxxxxxxxxxxxxx> > --- > Tested with the updated TWL GPIO and pwrirq drivers (now using > handle_edge_irq). It should behave without those updates, too. > > drivers/mfd/twl4030-core.c | 75 ++----------------------------------------- > 1 file changed, 4 insertions(+), 71 deletions(-) > > --- a/drivers/mfd/twl4030-core.c > +++ b/drivers/mfd/twl4030-core.c > @@ -535,68 +535,6 @@ EXPORT_SYMBOL(twl4030_i2c_read_u8); > > /*----------------------------------------------------------------------*/ > > -/* > - * do_twl4030_module_irq() is the desc->handle method for each of the twl4030 > - * module interrupts that doesn't chain to another irq_chip (GPIO, power, etc). > - * It executes in kernel thread context. On entry, cpu interrupts are disabled. > - */ > -static void do_twl4030_module_irq(unsigned int irq, irq_desc_t *desc) > -{ > - struct irqaction *action; > - const unsigned int cpu = smp_processor_id(); > - > - /* > - * Earlier this was desc->triggered = 1; > - */ > - desc->status |= IRQ_LEVEL; > - > - /* > - * The desc->handle method would normally call the desc->chip->ack > - * method here, but we won't bother since our ack method is NULL. > - */ > - > - if (!desc->depth) { > - kstat_cpu(cpu).irqs[irq]++; > - > - action = desc->action; > - if (action) { > - int ret; > - int status = 0; > - int retval = 0; > - > - local_irq_enable(); > - > - do { > - /* Call the ISR with cpu interrupts enabled */ > - 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(); > - > - if (retval != IRQ_HANDLED) > - printk(KERN_ERR "ISR for TWL4030 module" > - " irq %d can't handle interrupt\n", > - irq); > - > - /* > - * Here is where we should call the unmask method, but > - * again we won't bother since it is NULL. > - */ > - } else > - printk(KERN_CRIT "TWL4030 module irq %d has no ISR" > - " but can't be masked!\n", irq); > - } else > - printk(KERN_CRIT "TWL4030 module irq %d is disabled but can't" > - " be masked!\n", irq); > -} > - > static unsigned twl4030_irq_base; > > static struct completion irq_event; > @@ -611,7 +549,6 @@ static int twl4030_irq_thread(void *data > static unsigned i2c_errors; > const static unsigned max_i2c_errors = 100; > > - daemonize("twl4030-irq"); > current->flags |= PF_NOFREEZE; > > while (!kthread_should_stop()) { > @@ -691,8 +625,7 @@ static struct task_struct * __init start > struct task_struct *thread; > > init_completion(&irq_event); > - thread = kthread_run(twl4030_irq_thread, (void *)irq, > - "twl4030 irq %ld", irq); > + thread = kthread_run(twl4030_irq_thread, (void *)irq, "twl4030-irq"); > if (!thread) > pr_err("%s: could not create twl4030 irq %ld thread!\n", > DRIVER_NAME, irq); > @@ -1126,7 +1059,7 @@ static void twl_init_irq(int irq_num, un > /* install an irq handler for each of the PIH modules */ > for (i = irq_base; i < irq_end; i++) { > set_irq_chip_and_handler(i, &twl4030_irq_chip, > - do_twl4030_module_irq); > + handle_simple_irq); > activate_irq(i); > } > > -- > To unsubscribe from this list: send the line "unsubscribe linux-omap" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html