can: c_can: Cleanup c_can_read_msg_object()

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Alexander Stein <alexander.stein@systec-electronic.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

diff --git a/drivers/net/can/c_can/c_can.c b/drivers/net/can/c_can/c_can.c
index 562faef..d0daef8 100644 (file)
--- a/drivers/net/can/c_can/c_can.c
+++ b/drivers/net/can/c_can/c_can.c
@@ -380,15 +380,13 @@ static int c_can_handle_lost_msg_obj(struct net_device *dev,
        return 1;
 }
 
-static int c_can_read_msg_object(struct net_device *dev, int iface, int ctrl)
+static int c_can_read_msg_object(struct net_device *dev, int iface, u32 ctrl)
 {
-       u16 flags, data;
-       int i;
-       unsigned int val;
-       struct c_can_priv *priv = netdev_priv(dev);
        struct net_device_stats *stats = &dev->stats;
-       struct sk_buff *skb;
+       struct c_can_priv *priv = netdev_priv(dev);
        struct can_frame *frame;
+       struct sk_buff *skb;
+       u32 arb, data;
 
        skb = alloc_can_skb(dev, &frame);
        if (!skb) {
@@ -398,21 +396,21 @@ static int c_can_read_msg_object(struct net_device *dev, int iface, int ctrl)
 
        frame->can_dlc = get_can_dlc(ctrl & 0x0F);
 
-       flags = priv->read_reg(priv, C_CAN_IFACE(ARB2_REG, iface));
-       val = priv->read_reg(priv, C_CAN_IFACE(ARB1_REG, iface)) |
-               (flags << 16);
+       arb = priv->read_reg(priv, C_CAN_IFACE(ARB1_REG, iface));
+       arb |= priv->read_reg(priv, C_CAN_IFACE(ARB2_REG, iface)) << 16;
 
-       if (flags & IF_ARB_MSGXTD)
-               frame->can_id = (val & CAN_EFF_MASK) | CAN_EFF_FLAG;
+       if (arb & (IF_ARB_MSGXTD << 16))
+               frame->can_id = (arb & CAN_EFF_MASK) | CAN_EFF_FLAG;
        else
-               frame->can_id = (val >> 18) & CAN_SFF_MASK;
+               frame->can_id = (arb >> 18) & CAN_SFF_MASK;
 
-       if (flags & IF_ARB_TRANSMIT)
+       if (arb & (IF_ARB_TRANSMIT << 16)) {
                frame->can_id |= CAN_RTR_FLAG;
-       else {
-               for (i = 0; i < frame->can_dlc; i += 2) {
-                       data = priv->read_reg(priv,
-                               C_CAN_IFACE(DATA1_REG, iface) + i / 2);
+       } else {
+               int i, dreg = C_CAN_IFACE(DATA1_REG, iface);
+
+               for (i = 0; i < frame->can_dlc; i += 2, dreg ++) {
+                       data = priv->read_reg(priv, dreg);
                        frame->data[i] = data;
                        frame->data[i + 1] = data >> 8;
                }