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Date: Thu, 9 Oct 2008 00:41:24 +0200
From: Samuel Ortiz <sameo@...nedhand.com>
To: David Brownell <david-b@...bell.net>
Cc: lkml <linux-kernel@...r.kernel.org>,
Tony Lindgren <tony@...mide.com>
Subject: Re: [patch 2.6.27-rc8-git] add drivers/mfd/twl4030-core.c
On Wed, Oct 08, 2008 at 10:50:59AM -0700, David Brownell wrote:
> On Wednesday 08 October 2008, Samuel Ortiz wrote:
> > Thanks, applied to my mfd tree.
>
> Great!
>
> > > +#if defined(CONFIG_TWL4030_BCI_BATTERY) || \
> > > + defined(CONFIG_TWL4030_BCI_BATTERY_MODUEL)
> >
> > minor typo, you probably meant: CONFIG_TWL4030_BCI_BATTERY_MODULE
>
> Yes, good catch. You'll tweak?
Sure.
> Appended is that simple IRQ cleanup I mentioned.
> (Get a load of the diffstat!)
Sweet. I should look at it for the asic3 driver.
Applied to the mfd tree, thanks.
> There's more substantial IRQ stuff on the way, but
> it won't be ready before the 2.6.28 merges start.
I can still take patches during the merge window, if you think they're really
ready and necessary.
Cheers,
Samuel.
> - Dave
>
> ================== CUT HERE
> From: David Brownell <dbrownell@...rs.sourceforge.net>
>
> twl4030-core irq simplification
>
> 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).
>
> Signed-off-by: David Brownell <dbrownell@...rs.sourceforge.net>
> Signed-off-by: Tony Lindgren <tony@...mide.com>
> ---
> drivers/mfd/twl4030-core.c | 68 +--------------------------------------------
> 1 file changed, 2 insertions(+), 66 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 +628,7 @@ static struct task_struct * __init start_twl4030_irq_thread(long irq)
> 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 +1062,7 @@ static void twl_init_irq(int irq_num, unsigned irq_base, unsigned irq_end)
> /* 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);
> }
>
>
--
Intel Open Source Technology Centre
http://oss.intel.com/
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