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

Excerpts from Alan Cox's message of sam avr 30 06:15:36 -0400 2011:

quoted

+    /* 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.