mfd: rc5t583: Fix array subscript is above array bounds

I got below build warning while compiling this driver.
It's obviously RC5T583_MAX_INTERRUPT_MASK_REGS is 9 but irq_en_add
array only has 8 elements.

  CC      drivers/mfd/rc5t583-irq.o
drivers/mfd/rc5t583-irq.c: In function 'rc5t583_irq_sync_unlock':
drivers/mfd/rc5t583-irq.c:227: warning: array subscript is above array bounds
drivers/mfd/rc5t583-irq.c: In function 'rc5t583_irq_init':
drivers/mfd/rc5t583-irq.c:349: warning: array subscript is above array bounds

Since the number of interrupt enable registers is 8, this patch adds
define for RC5T583_MAX_INTERRUPT_EN_REGS to fix this bug.

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Acked-by: Laxman Dewangan <ldewangan@nvidia.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

2 files changed, 3 insertions, 2 deletions

diff --git a/drivers/mfd/rc5t583-irq.c b/drivers/mfd/rc5t583-irq.c
index fe00cdd6f83d..b41db5968706 100644
--- a/drivers/mfd/rc5t583-irq.c
+++ b/drivers/mfd/rc5t583-irq.c
@@ -345,7 +345,7 @@ int rc5t583_irq_init(struct rc5t583 *rc5t583, int irq, int irq_base)
         mutex_init(&rc5t583->irq_lock);
 
         /* Initailize all int register to 0 */
-        for (i = 0; i < RC5T583_MAX_INTERRUPT_MASK_REGS; i++)  {
+        for (i = 0; i < RC5T583_MAX_INTERRUPT_EN_REGS; i++)  {
                 ret = rc5t583_write(rc5t583->dev, irq_en_add[i],
                                 rc5t583->irq_en_reg[i]);
                 if (ret < 0)
diff --git a/include/linux/mfd/rc5t583.h b/include/linux/mfd/rc5t583.h
index 36c242e52ef1..fd413ccab915 100644
--- a/include/linux/mfd/rc5t583.h
+++ b/include/linux/mfd/rc5t583.h
@@ -33,6 +33,7 @@
 /* Maximum number of main interrupts */
 #define MAX_MAIN_INTERRUPT              5
 #define RC5T583_MAX_GPEDGE_REG          2
+#define RC5T583_MAX_INTERRUPT_EN_REGS   8
 #define RC5T583_MAX_INTERRUPT_MASK_REGS 9
 
 /* Interrupt enable register */
@@ -304,7 +305,7 @@ struct rc5t583 {
         uint8_t         intc_inten_reg;
 
         /* For group interrupt bits and address */
-        uint8_t         irq_en_reg[RC5T583_MAX_INTERRUPT_MASK_REGS];
+        uint8_t         irq_en_reg[RC5T583_MAX_INTERRUPT_EN_REGS];
 
         /* For gpio edge */
         uint8_t         gpedge_reg[RC5T583_MAX_GPEDGE_REG];