linux-kernel - [PATCH 3.16 175/305] can: dev: can_get_echo_skb(): factor out non sending code to __can_get_echo

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <lsq.1549201508.286047024@decadent.org.uk>
Date:   Sun, 03 Feb 2019 14:45:08 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, Denis Kirjanov <kda@...ux-powerpc.org>,
        "Marc Kleine-Budde" <mkl@...gutronix.de>
Subject: [PATCH 3.16 175/305] can: dev: can_get_echo_skb(): factor out non
 sending code to __can_get_echo_skb()

3.16.63-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Marc Kleine-Budde <mkl@...gutronix.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.

Signed-off-by: Marc Kleine-Budde <mkl@...gutronix.de>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 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
@@ -422,14 +422,7 @@ 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);
 
@@ -440,13 +433,34 @@ 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
@@ -127,6 +127,7 @@ 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);