[PARISC] Use work queue in LED/LCD driver instead of tasklet.

2.6.12-rc1-pa6 use work queue in LED/LCD driver instead of tasklet.

Main advantage is it allows use of msleep() in the led_LCD_driver to
"atomically" perform two MMIO writes (CMD, then DATA).
Lead to nice cleanup of the main led_work_func() and led_LCD_driver().
Kudos to David for being persistent.

From: David Pye <dmp@davidmpye.dyndns.org>
Signed-off-by: Grant Grundler <grundler@parisc-linux.org>
Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>

arch/parisc/kernel/time.c

@@ -89,14 +89,6 @@ irqreturn_t timer_interrupt(int irq, void *dev_id, struct pt_regs *regs)
 		}
 	}
     
-#ifdef CONFIG_CHASSIS_LCD_LED
-	/* Only schedule the led tasklet on cpu 0, and only if it
-	 * is enabled.
-	 */
-	if (cpu == 0 && !atomic_read(&led_tasklet.count))
-		tasklet_schedule(&led_tasklet);
-#endif
-
 	/* check soft power switch status */
 	if (cpu == 0 && !atomic_read(&power_tasklet.count))
 		tasklet_schedule(&power_tasklet);

include/asm-parisc/led.h

@@ -23,9 +23,6 @@
 
 #define LED_CMD_REG_NONE 0		/* NULL == no addr for the cmd register */
 
-/* led tasklet struct */
-extern struct tasklet_struct led_tasklet;
-
 /* register_led_driver() */
 int __init register_led_driver(int model, unsigned long cmd_reg, unsigned long data_reg);