Re: [RFC 2/5] gpio: add support for Technologic Systems TS-5500 GPIOs

Vivien Didelot
2011-05-13T21:33:56Z

Excerpts from Alan Cox's message of sam avr 30 06:15:36 -0400 2011:
> > + /* Enable IRQ generation */
> > + mutex_lock(&drvdata->gpio_lock);
> > + PORT_BIT_SET(0x7A, 7); /* DIO1_13 on IRQ7 */
> > + PORT_BIT_SET(0x7D, 7); /* DIO2_13 on IRQ6 */
> > + if (use_lcdio) {
> > + PORT_BIT_CLEAR(0x7D, 4); /* Enable LCD header usage as DIO */
> > + PORT_BIT_SET(0x7D, 6); /* LCD_RS on IRQ1 */
> > + }
>
> What happens if an IRQ occurs at this point, you have no handler for it ?

The IRQ is just not handled. What would be the proper way to handle
that? Would it be possible to write those registers when the IRQ is
requested?

Thanks,
Vivien.