netdev - [PATCH 2/9] can: dev: let can_get_echo

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Message-Id: <1328230318-8962-3-git-send-email-mkl@pengutronix.de>
Date:	Fri,  3 Feb 2012 01:51:51 +0100
From:	Marc Kleine-Budde <mkl@...gutronix.de>
To:	davem@...emloft.net
Cc:	Netdev@...r.kernel.org, kernel@...gutronix.de, mkl@...ckshift.org,
	linux-can@...r.kernel.org, Marc Kleine-Budde <mkl@...gutronix.de>
Subject: [PATCH 2/9] can: dev: let can_get_echo_skb() return dlc of CAN frame

can_get_echo_skb() is usually called in the TX complete handler.
The stats->tx_packets and stats->tx_bytes should be updated there, too.
This patch simplifies to figure out the size of the sent CAN frame.

Signed-off-by: Marc Kleine-Budde <mkl@...gutronix.de>
---
 drivers/net/can/dev.c   |   10 +++++++++-
 include/linux/can/dev.h |    2 +-
 2 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/drivers/net/can/dev.c b/drivers/net/can/dev.c
index 120f1ab..9d9799c 100644
--- a/drivers/net/can/dev.c
+++ b/drivers/net/can/dev.c
@@ -327,16 +327,24 @@ EXPORT_SYMBOL_GPL(can_put_echo_skb);
  * is handled in the device driver. The driver must protect
  * access to priv->echo_skb, if necessary.
  */
-void can_get_echo_skb(struct net_device *dev, unsigned int idx)
+unsigned int can_get_echo_skb(struct net_device *dev, unsigned int idx)
 {
 	struct can_priv *priv = netdev_priv(dev);
 
 	BUG_ON(idx >= priv->echo_skb_max);
 
 	if (priv->echo_skb[idx]) {
+		struct sk_buff *skb = priv->echo_skb[idx];
+		struct can_frame *cf = (struct can_frame *)skb->data;
+		u8 dlc = cf->can_dlc;
+
 		netif_rx(priv->echo_skb[idx]);
 		priv->echo_skb[idx] = NULL;
+
+		return dlc;
 	}
+
+	return 0;
 }
 EXPORT_SYMBOL_GPL(can_get_echo_skb);
 
diff --git a/include/linux/can/dev.h b/include/linux/can/dev.h
index a0969fc..5d2efe7 100644
--- a/include/linux/can/dev.h
+++ b/include/linux/can/dev.h
@@ -92,7 +92,7 @@ void can_bus_off(struct net_device *dev);
 
 void can_put_echo_skb(struct sk_buff *skb, struct net_device *dev,
 		      unsigned int idx);
-void can_get_echo_skb(struct net_device *dev, unsigned int idx);
+unsigned int can_get_echo_skb(struct net_device *dev, unsigned int idx);
 void can_free_echo_skb(struct net_device *dev, unsigned int idx);
 
 struct sk_buff *alloc_can_skb(struct net_device *dev, struct can_frame **cf);
-- 
1.7.4.1

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