[PATCH 4.4 128/342] irqchip/atmel-aic: Fix wrong bit operation for IRQ priority

[Greg Kroah-Hartman]

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Milo Kim <milo.kim@xxxxxx>

commit 49f34134aea74f19ca016f055d25ee55ec359dee upstream.

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: b1479ebb7720 "irqchip: atmel-aic: Add atmel AIC/AIC5 drivers"
Signed-off-by: Milo Kim <milo.kim@xxxxxx>
Acked-by: Boris Brezillon <boris.brezillon@xxxxxxxxxxxxxxxxxx>
Cc: Jason Cooper <jason@xxxxxxxxxxxxxx>
Cc: Marc Zyngier <marc.zyngier@xxxxxxx>
Cc: Ludovic Desroches <ludovic.desroches@xxxxxxxxx>
Cc: Nicholas Ferre <nicolas.ferre@xxxxxxxxx>
Link: http://lkml.kernel.org/r/1452669592-3401-2-git-send-email-milo.kim@xxxxxx
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 drivers/irqchip/irq-atmel-aic-common.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/irqchip/irq-atmel-aic-common.c
+++ b/drivers/irqchip/irq-atmel-aic-common.c
@@ -86,7 +86,7 @@ int aic_common_set_priority(int priority
 	    priority > AT91_AIC_IRQ_MAX_PRIORITY)
 		return -EINVAL;
 
-	*val &= AT91_AIC_PRIOR;
+	*val &= ~AT91_AIC_PRIOR;
 	*val |= priority;
 
 	return 0;