irqchip/atmel-aic: Fix wrong bit operation for IRQ priority

Atmel AIC has common structure for SMR (Source Mode Register).

  bit[6:5] Interrupt source type
  bit[2:0] Priority level
  Other bits are unused.

To update new priority value, bit[2:0] should be cleared first and then
new priority level can be written. However, aic_common_set_priority()
helper clears source type bits instead of priority bits.
This patch fixes wrong mask bit operation.

Fixes: b1479eb "irqchip: atmel-aic: Add atmel AIC/AIC5 drivers"
Signed-off-by: Milo Kim <[email protected]>
Acked-by: Boris Brezillon <[email protected]>
Cc: Jason Cooper <[email protected]>
Cc: Marc Zyngier <[email protected]>
Cc: Ludovic Desroches <[email protected]>
Cc: Nicholas Ferre <[email protected]>
Cc: [email protected] #v3.17+
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Thomas Gleixner <[email protected]>

Author: Milo Kim

drivers/irqchip/irq-atmel-aic-common.c

@@ -86,7 +86,7 @@ int aic_common_set_priority(int priority, unsigned *val)
 	    priority > AT91_AIC_IRQ_MAX_PRIORITY)
 		return -EINVAL;
 
-	*val &= AT91_AIC_PRIOR;
+	*val &= ~AT91_AIC_PRIOR;
 	*val |= priority;
 
 	return 0;