Merge tag 'linux-can-next-for-5.14-20210527' of git://git.kernel.org/pub/scm/linux/kernel/git/mkl/linux-can-next

Marc Kleine-Budde says:

====================
can-next 2021-05-27

The first 2 patches are by Geert Uytterhoeven and convert the rcan_can
and rcan_canfd device tree bindings to yaml.

The next 2 patches are by Oliver Hartkopp and me and update the CAN
uapi headers.

zuoqilin's patch removes an unnecessary variable from the CAN proc
code.

Patrick Menschel contributes 3 patches for CAN ISOTP to enhance the
error messages.

Jiapeng Chong's patch removes two dead stores from the softing driver.

The next 4 patches are by me and silence several warnings found by
clang compiler.

Jimmy Assarsson's patches for the kvaser_usb driver add support for
the Kvaser hydra devices.

Dario Binacchi provides 2 patches for the c_can driver, first removing
an unused variable, then adding basic ethtool support to query driver
and ring parameter info.

The last 4 patches are by Torin Cooper-Bennun and clean up the m_can
driver.

* tag 'linux-can-next-for-5.14-20210527' of git://git.kernel.org/pub/scm/linux/kernel/git/mkl/linux-can-next: (21 commits)
  can: m_can: fix whitespace in a few comments
  can: m_can: make TXESC, RXESC config more explicit
  can: m_can: clean up CCCR reg defs, order by revs
  can: m_can: use bits.h macros for all regmasks
  can: c_can: add ethtool support
  can: c_can: remove unused variable struct c_can_priv::rxmasked
  can: kvaser_usb: Add new Kvaser hydra devices
  can: kvaser_usb: Rename define USB_HYBRID_{,PRO_}CANLIN_PRODUCT_ID
  can: at91_can: silence clang warning
  can: mcp251xfd: silence clang warning
  can: mcp251x: mcp251x_can_probe(): silence clang warning
  can: hi311x: hi3110_can_probe(): silence clang warning
  can: softing: Remove redundant variable ptr
  can: isotp: Add error message if txqueuelen is too small
  can: isotp: add symbolic error message to isotp_module_init()
  can: isotp: change error format from decimal to symbolic error names
  can: proc: remove unnecessary variables
  can: uapi: introduce CANFD_FDF flag for mixed content in struct canfd_frame
  can: uapi: update CAN-FD frame description
  dt-bindings: can: rcar_canfd: Convert to json-schema
  ...
====================

Link: https://lore.kernel.org/r/20210527084532.1384031-1-mkl@pengutronix.de
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

2 files changed, 12 insertions, 14 deletions

diff --git a/net/can/isotp.c b/net/can/isotp.c
index 253b24417c8e..f995eaef5d7b 100644
--- a/net/can/isotp.c
+++ b/net/can/isotp.c
@@ -221,8 +221,8 @@ static int isotp_send_fc(struct sock *sk, int ae, u8 flowstatus)
 
 	can_send_ret = can_send(nskb, 1);
 	if (can_send_ret)
-		pr_notice_once("can-isotp: %s: can_send_ret %d\n",
-			       __func__, can_send_ret);
+		pr_notice_once("can-isotp: %s: can_send_ret %pe\n",
+			       __func__, ERR_PTR(can_send_ret));
 
 	dev_put(dev);
 
@@ -797,10 +797,12 @@ isotp_tx_burst:
 		can_skb_set_owner(skb, sk);
 
 		can_send_ret = can_send(skb, 1);
-		if (can_send_ret)
-			pr_notice_once("can-isotp: %s: can_send_ret %d\n",
-				       __func__, can_send_ret);
-
+		if (can_send_ret) {
+			pr_notice_once("can-isotp: %s: can_send_ret %pe\n",
+				       __func__, ERR_PTR(can_send_ret));
+			if (can_send_ret == -ENOBUFS)
+				pr_notice_once("can-isotp: tx queue is full, increasing txqueuelen may prevent this error\n");
+		}
 		if (so->tx.idx >= so->tx.len) {
 			/* we are done */
 			so->tx.state = ISOTP_IDLE;
@@ -946,8 +948,8 @@ static int isotp_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
 	err = can_send(skb, 1);
 	dev_put(dev);
 	if (err) {
-		pr_notice_once("can-isotp: %s: can_send_ret %d\n",
-			       __func__, err);
+		pr_notice_once("can-isotp: %s: can_send_ret %pe\n",
+			       __func__, ERR_PTR(err));
 		return err;
 	}
 
@@ -1450,7 +1452,7 @@ static __init int isotp_module_init(void)
 
 	err = can_proto_register(&isotp_can_proto);
 	if (err < 0)
-		pr_err("can: registration of isotp protocol failed\n");
+		pr_err("can: registration of isotp protocol failed %pe\n", ERR_PTR(err));
 
 	return err;
 }
diff --git a/net/can/proc.c b/net/can/proc.c
index d1fe49e6f16d..b3099f0a3cb8 100644
--- a/net/can/proc.c
+++ b/net/can/proc.c
@@ -99,8 +99,6 @@ static void can_init_stats(struct net *net)
 static unsigned long calc_rate(unsigned long oldjif, unsigned long newjif,
 			       unsigned long count)
 {
-	unsigned long rate;
-
 	if (oldjif == newjif)
 		return 0;
 
@@ -111,9 +109,7 @@ static unsigned long calc_rate(unsigned long oldjif, unsigned long newjif,
 		return 99999999;
 	}
 
-	rate = (count * HZ) / (newjif - oldjif);
-
-	return rate;
+	return (count * HZ) / (newjif - oldjif);
 }
 
 void can_stat_update(struct timer_list *t)