Subject: [PATCH net-next v2 1/2] can-isotp: implement cleanups / improvements from review

From: Oliver Hartkopp <[email-masked]>
Date: Sun, 11 Oct 2020 11:24:07 +0200

As pointed out by Jakub Kicinski here:
http://lore.kernel.org/r/[email-masked]
this patch addresses the remarked issues:

- remove empty line in comment
- remove default=y for CAN_ISOTP in Kconfig
- make use of pr_notice_once()
- use GFP_KERNEL instead of gfp_any() in soft hrtimer context
- make use of pr_fmt() [suggested my Marc Kleine-Budde]

The version strings in the CAN subsystem are removed by a separate patch.

Signed-off-by: Oliver Hartkopp <[email-masked]>
---
 include/uapi/linux/can/isotp.h |  1 -
 net/can/Kconfig                |  3 ++-
 net/can/isotp.c                | 19 ++++++++++---------
 3 files changed, 12 insertions(+), 11 deletions(-)

diff --git a/include/uapi/linux/can/isotp.h b/include/uapi/linux/can/isotp.h
index 553006509f4e..7793b26aa154 100644
--- a/include/uapi/linux/can/isotp.h
+++ b/include/uapi/linux/can/isotp.h
@@ -160,7 +160,6 @@ struct can_isotp_ll_options {
  * these default settings can be changed via sockopts.
  * For that reason the STmin value is intentionally _not_ checked for
  * consistency and copied directly into the flow control (FC) frame.
- *
  */
 
 #endif /* !_UAPI_CAN_ISOTP_H */
diff --git a/net/can/Kconfig b/net/can/Kconfig
index 021fe03a8ed6..224e5e0283a9 100644
--- a/net/can/Kconfig
+++ b/net/can/Kconfig
@@ -57,7 +57,6 @@ source "net/can/j1939/Kconfig"
 
 config CAN_ISOTP
 	tristate "ISO 15765-2:2016 CAN transport protocol"
-	default y
 	help
 	  CAN Transport Protocols offer support for segmented Point-to-Point
 	  communication between CAN nodes via two defined CAN Identifiers.
@@ -67,6 +66,8 @@ config CAN_ISOTP
 	  vehicle diagnosis (UDS, ISO 14229) or IP-over-CAN traffic.
 	  This protocol driver implements data transfers according to
 	  ISO 15765-2:2016 for 'classic' CAN and CAN FD frame types.
+	  If you want to perform automotive vehicle diagnostic services (UDS),
+	  say 'y'.
 
 source "drivers/net/can/Kconfig"
 
diff --git a/net/can/isotp.c b/net/can/isotp.c
index e6ff032b5426..22187669c5c9 100644
--- a/net/can/isotp.c
+++ b/net/can/isotp.c
@@ -79,6 +79,8 @@ MODULE_LICENSE("Dual BSD/GPL");
 MODULE_AUTHOR("Oliver Hartkopp <[email-masked]>");
 MODULE_ALIAS("can-proto-6");
 
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
 #define SINGLE_MASK(id) (((id) & CAN_EFF_FLAG) ? \
 			 (CAN_EFF_MASK | CAN_EFF_FLAG | CAN_RTR_FLAG) : \
 			 (CAN_SFF_MASK | CAN_EFF_FLAG | CAN_RTR_FLAG))
@@ -222,8 +224,8 @@ static int isotp_send_fc(struct sock *sk, int ae, u8 flowstatus)
 
 	can_send_ret = can_send(nskb, 1);
 	if (can_send_ret)
-		printk_once(KERN_NOTICE "can-isotp: %s: can_send_ret %d\n",
-			    __func__, can_send_ret);
+		pr_notice_once("%s: can_send_ret %d\n",
+			       __func__, can_send_ret);
 
 	dev_put(dev);
 
@@ -769,7 +771,7 @@ static enum hrtimer_restart isotp_tx_timer_handler(struct hrtimer *hrtimer)
 
 isotp_tx_burst:
 		skb = alloc_skb(so->ll.mtu + sizeof(struct can_skb_priv),
-				gfp_any());
+				GFP_KERNEL);
 		if (!skb) {
 			dev_put(dev);
 			break;
@@ -798,8 +800,8 @@ static enum hrtimer_restart isotp_tx_timer_handler(struct hrtimer *hrtimer)
 
 		can_send_ret = can_send(skb, 1);
 		if (can_send_ret)
-			printk_once(KERN_NOTICE "can-isotp: %s: can_send_ret %d\n",
-				    __func__, can_send_ret);
+			pr_notice_once("%s: can_send_ret %d\n",
+				       __func__, can_send_ret);
 
 		if (so->tx.idx >= so->tx.len) {
 			/* we are done */
@@ -942,8 +944,7 @@ static int isotp_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
 	err = can_send(skb, 1);
 	dev_put(dev);
 	if (err) {
-		printk_once(KERN_NOTICE "can-isotp: %s: can_send_ret %d\n",
-			    __func__, err);
+		pr_notice_once("%s: can_send_ret %d\n", __func__, err);
 		return err;
 	}
 
@@ -1408,11 +1409,11 @@ static __init int isotp_module_init(void)
 {
 	int err;
 
-	pr_info("can: isotp protocol (rev " CAN_ISOTP_VERSION ")\n");
+	pr_info("isotp protocol (rev " CAN_ISOTP_VERSION ")\n");
 
 	err = can_proto_register(&isotp_can_proto);
 	if (err < 0)
-		pr_err("can: registration of isotp protocol failed\n");
+		pr_err("registration of isotp protocol failed\n");
 
 	return err;
 }
-- 
2.28.0