1 files changed, 12 insertions, 25 deletions

diff --git a/drivers/net/can/c_can/c_can.c b/drivers/net/can/c_can/c_can.c
index 5d43c5a0e2d9..562faef29896 100644
--- a/drivers/net/can/c_can/c_can.c
+++ b/drivers/net/can/c_can/c_can.c
@@ -60,6 +60,8 @@
 #define CONTROL_IE              BIT(1)
 #define CONTROL_INIT            BIT(0)
 
+#define CONTROL_IRQMSK          (CONTROL_EIE | CONTROL_IE | CONTROL_SIE)
+
 /* test register */
 #define TEST_RX                 BIT(7)
 #define TEST_TX1                BIT(6)
@@ -146,13 +148,6 @@
 #define IF_RX                   0
 #define IF_TX                   1
 
-/* status interrupt */
-#define STATUS_INTERRUPT        0x8000
-
-/* global interrupt masks */
-#define ENABLE_ALL_INTERRUPTS   1
-#define DISABLE_ALL_INTERRUPTS  0
-
 /* minimum timeout for checking BUSY status */
 #define MIN_TIMEOUT_VALUE       6
 
@@ -246,18 +241,14 @@ static u32 c_can_read_reg32(struct c_can_priv *priv, enum reg index)
         return val;
 }
 
-static void c_can_enable_all_interrupts(struct c_can_priv *priv,
-                                                int enable)
+static void c_can_irq_control(struct c_can_priv *priv, bool enable)
 {
-        unsigned int cntrl_save = priv->read_reg(priv,
-                                                C_CAN_CTRL_REG);
+        u32 ctrl = priv->read_reg(priv, C_CAN_CTRL_REG) & ~CONTROL_IRQMSK;
 
         if (enable)
-                cntrl_save |= (CONTROL_SIE | CONTROL_EIE | CONTROL_IE);
-        else
-                cntrl_save &= ~(CONTROL_EIE | CONTROL_IE | CONTROL_SIE);
+                ctrl |= CONTROL_IRQMSK;
 
-        priv->write_reg(priv, C_CAN_CTRL_REG, cntrl_save);
+        priv->write_reg(priv, C_CAN_CTRL_REG, ctrl);
 }
 
 static inline int c_can_msg_obj_is_busy(struct c_can_priv *priv, int iface)
@@ -664,10 +655,7 @@ static void c_can_stop(struct net_device *dev)
 {
         struct c_can_priv *priv = netdev_priv(dev);
 
-        /* disable all interrupts */
-        c_can_enable_all_interrupts(priv, DISABLE_ALL_INTERRUPTS);
-
-        /* set the state as STOPPED */
+        c_can_irq_control(priv, false);
         priv->can.state = CAN_STATE_STOPPED;
 }
 
@@ -682,8 +670,7 @@ static int c_can_set_mode(struct net_device *dev, enum can_mode mode)
                 if (err)
                         return err;
                 netif_wake_queue(dev);
-                /* enable status change, error and module interrupts */
-                c_can_enable_all_interrupts(priv, ENABLE_ALL_INTERRUPTS);
+                c_can_irq_control(priv, true);
                 break;
         default:
                 return -EOPNOTSUPP;
@@ -1144,7 +1131,7 @@ end:
                 napi_complete(napi);
                 /* enable all IRQs if we are not in bus off state */
                 if (priv->can.state != CAN_STATE_BUS_OFF)
-                        c_can_enable_all_interrupts(priv, ENABLE_ALL_INTERRUPTS);
+                        c_can_irq_control(priv, true);
         }
 
         return work_done;
@@ -1159,7 +1146,7 @@ static irqreturn_t c_can_isr(int irq, void *dev_id)
                 return IRQ_NONE;
 
         /* disable all interrupts and schedule the NAPI */
-        c_can_enable_all_interrupts(priv, DISABLE_ALL_INTERRUPTS);
+        c_can_irq_control(priv, false);
         napi_schedule(&priv->napi);
 
         return IRQ_HANDLED;
@@ -1197,7 +1184,7 @@ static int c_can_open(struct net_device *dev)
 
         napi_enable(&priv->napi);
         /* enable status change, error and module interrupts */
-        c_can_enable_all_interrupts(priv, ENABLE_ALL_INTERRUPTS);
+        c_can_irq_control(priv, true);
         netif_start_queue(dev);
 
         return 0;
@@ -1324,7 +1311,7 @@ int c_can_power_up(struct net_device *dev)
 
         ret = c_can_start(dev);
         if (!ret)
-                c_can_enable_all_interrupts(priv, ENABLE_ALL_INTERRUPTS);
+                c_can_irq_control(priv, true);
 
         return ret;
 }