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Message-ID: <alpine.DEB.2.02.1403181924440.18573@ionos.tec.linutronix.de>
Date: Tue, 18 Mar 2014 19:27:42 +0100 (CET)
From: Thomas Gleixner <tglx@...utronix.de>
To: Joe Perches <joe@...ches.com>
cc: LKML <linux-kernel@...r.kernel.org>,
Wolfgang Grandegger <wg@...ndegger.com>,
Marc Kleine-Budde <mkl@...gutronix.de>,
Markus Pargmann <mpa@...gutronix.de>,
Benedikt Spranger <b.spranger@...utronix.de>,
linux-can@...r.kernel.org, netdev@...r.kernel.org
Subject: [patch 08/12 V2] can: c_can: Makethe code readable
If every other line contains line breaks, that's a clear sign for
indentation level madness. Split out the inner loop and move the code
to a separate function. gcc creates slightly worse code for that, but
we'll fix that in the next step.
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
---
V2: Remove the pointless multiwhile. Noted by Joe Perches
Sorry for the noise.
drivers/net/can/c_can/c_can.c | 107 +++++++++++++++++++++---------------------
1 file changed, 56 insertions(+), 51 deletions(-)
Index: linux/drivers/net/can/c_can/c_can.c
===================================================================
--- linux.orig/drivers/net/can/c_can/c_can.c
+++ linux/drivers/net/can/c_can/c_can.c
@@ -840,6 +840,52 @@ static u32 c_can_adjust_pending(u32 pend
return pend & ~((1 << lasts) - 1);
}
+static int c_can_read_objects(struct net_device *dev, struct c_can_priv *priv,
+ u32 pend, int quota)
+{
+ u32 pkts = 0, ctrl, obj;
+
+ while ((obj = ffs(pend)) && quota > 0) {
+ pend &= ~BIT(obj - 1);
+
+ c_can_object_get(dev, IF_RX, obj, IF_COMM_ALL & ~IF_COMM_TXRQST);
+ ctrl = priv->read_reg(priv, C_CAN_IFACE(MSGCTRL_REG, IF_RX));
+
+ if (ctrl & IF_MCONT_MSGLST) {
+ int n = c_can_handle_lost_msg_obj(dev, IF_RX, obj, ctrl);
+
+ pkts += n;
+ quota -= n;
+ continue;
+ }
+
+ /*
+ * This really should not happen, but this covers some
+ * odd HW behaviour. Do not remove that unless you
+ * want to brick your machine.
+ */
+ if (!(ctrl & IF_MCONT_NEWDAT))
+ continue;
+
+ /* read the data from the message object */
+ c_can_read_msg_object(dev, IF_RX, ctrl);
+
+ if (obj < C_CAN_MSG_RX_LOW_LAST)
+ c_can_mark_rx_msg_obj(dev, IF_RX, ctrl, obj);
+ else if (obj > C_CAN_MSG_RX_LOW_LAST)
+ /* activate this msg obj */
+ c_can_activate_rx_msg_obj(dev, IF_RX, ctrl, obj);
+ else if (obj == C_CAN_MSG_RX_LOW_LAST)
+ /* activate all lower message objects */
+ c_can_activate_all_lower_rx_msg_obj(dev, IF_RX, ctrl);
+
+ pkts++;
+ quota--;
+ }
+
+ return pkts;
+}
+
/*
* theory of operation:
*
@@ -864,10 +910,8 @@ static u32 c_can_adjust_pending(u32 pend
*/
static int c_can_do_rx_poll(struct net_device *dev, int quota)
{
- u32 num_rx_pkts = 0;
- unsigned int msg_obj, msg_ctrl_save;
struct c_can_priv *priv = netdev_priv(dev);
- u32 val, pend = 0;
+ u32 pkts = 0, pend = 0, toread, n;
/*
* It is faster to read only one 16bit register. This is only possible
@@ -877,65 +921,26 @@ static int c_can_do_rx_poll(struct net_d
"Implementation does not support more message objects than 16");
while (quota > 0) {
-
if (!pend) {
pend = priv->read_reg(priv, C_CAN_INTPND1_REG);
if (!pend)
- return num_rx_pkts;
+ break;
/*
* If the pending field has a gap, handle the
* bits above the gap first.
*/
- val = c_can_adjust_pending(pend);
+ toread = c_can_adjust_pending(pend);
} else {
- val = pend;
+ toread = pend;
}
/* Remove the bits from pend */
- pend &= ~val;
-
- while ((msg_obj = ffs(val)) && quota > 0) {
- val &= ~BIT(msg_obj - 1);
-
- c_can_object_get(dev, IF_RX, msg_obj, IF_COMM_ALL &
- ~IF_COMM_TXRQST);
- msg_ctrl_save = priv->read_reg(priv,
- C_CAN_IFACE(MSGCTRL_REG, IF_RX));
-
- if (msg_ctrl_save & IF_MCONT_MSGLST) {
- int n;
-
- n = c_can_handle_lost_msg_obj(dev, IF_RX,
- msg_obj,
- msg_ctrl_save);
- num_rx_pkts += n;
- quota -=n;
- continue;
- }
-
- if (!(msg_ctrl_save & IF_MCONT_NEWDAT))
- continue;
-
- /* read the data from the message object */
- c_can_read_msg_object(dev, IF_RX, msg_ctrl_save);
-
- if (msg_obj < C_CAN_MSG_RX_LOW_LAST)
- c_can_mark_rx_msg_obj(dev, IF_RX,
- msg_ctrl_save, msg_obj);
- else if (msg_obj > C_CAN_MSG_RX_LOW_LAST)
- /* activate this msg obj */
- c_can_activate_rx_msg_obj(dev, IF_RX,
- msg_ctrl_save, msg_obj);
- else if (msg_obj == C_CAN_MSG_RX_LOW_LAST)
- /* activate all lower message objects */
- c_can_activate_all_lower_rx_msg_obj(dev,
- IF_RX, msg_ctrl_save);
-
- num_rx_pkts++;
- quota--;
- }
+ pend &= ~toread;
+ /* Read the objects */
+ n = c_can_read_objects(dev, priv, toread, quota);
+ pkts += n;
+ quota -= n;
}
-
- return num_rx_pkts;
+ return pkts;
}
static inline int c_can_has_and_handle_berr(struct c_can_priv *priv)
--
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