[PATCH 4.9 20/92] can: dev: can_get_echo_skb(): factor out non sending code to __can_get_echo_skb()

Greg Kroah-Hartman
2018-11-29T14:23:01Z

From: Marc Kleine-Budde <mkl@pengutronix.de>

commit a4310fa2f24687888ce80fdb0e88583561a23700 upstream.

This patch factors out all non sending parts of can_get_echo_skb() into
a seperate function __can_get_echo_skb(), so that it can be re-used in
an upcoming patch.

Cc: linux-stable <stable@vger.kernel.org>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/net/can/dev.c | 36 +++++++++++++++++++++++++-----------
include/linux/can/dev.h | 1 +
2 files changed, 26 insertions(+), 11 deletions(-)

--- a/drivers/net/can/dev.c
+++ b/drivers/net/can/dev.c
@@ -453,14 +453,7 @@ void can_put_echo_skb(struct sk_buff *sk
}
EXPORT_SYMBOL_GPL(can_put_echo_skb);

-/*
- * Get the skb from the stack and loop it back locally
- *
- * The function is typically called when the TX done interrupt
- * is handled in the device driver. The driver must protect
- * access to priv->echo_skb, if necessary.
- */
-unsigned int can_get_echo_skb(struct net_device *dev, unsigned int idx)
+struct sk_buff *__can_get_echo_skb(struct net_device *dev, unsigned int idx, u8 *len_ptr)
{
struct can_priv *priv = netdev_priv(dev);

@@ -471,13 +464,34 @@ unsigned int can_get_echo_skb(struct net
struct can_frame *cf = (struct can_frame *)skb->data;
u8 dlc = cf->can_dlc;

- netif_rx(priv->echo_skb[idx]);
+ *len_ptr = dlc;
priv->echo_skb[idx] = NULL;

- return dlc;
+ return skb;
}

- return 0;
+ return NULL;
+}
+
+/*
+ * Get the skb from the stack and loop it back locally
+ *
+ * The function is typically called when the TX done interrupt
+ * is handled in the device driver. The driver must protect
+ * access to priv->echo_skb, if necessary.
+ */
+unsigned int can_get_echo_skb(struct net_device *dev, unsigned int idx)
+{
+ struct sk_buff *skb;
+ u8 len;
+
+ skb = __can_get_echo_skb(dev, idx, &len);
+ if (!skb)
+ return 0;
+
+ netif_rx(skb);
+
+ return len;
}
EXPORT_SYMBOL_GPL(can_get_echo_skb);

--- a/include/linux/can/dev.h
+++ b/include/linux/can/dev.h
@@ -154,6 +154,7 @@ void can_change_state(struct net_device

void can_put_echo_skb(struct sk_buff *skb, struct net_device *dev,
unsigned int idx);
+struct sk_buff *__can_get_echo_skb(struct net_device *dev, unsigned int idx, u8 *len_ptr);
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);