Merge branch 'can-slcan-checkpatch-cleanups'

Marc Kleine-Budde says:

====================
can: slcan: checkpatch cleanups

This is a patch series consisting of various checkpatch cleanups for
the slcan driver.
====================

Link: https://lore.kernel.org/all/20220704125954.1587880-1-mkl@pengutronix.de
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

drivers/net/can/slcan/slcan-core.c

@@ -67,13 +67,14 @@ MODULE_AUTHOR("Oliver Hartkopp <socketcan@hartkopp.net>");
 #define SLCAN_MAGIC 0x53CA
 
 static int maxdev = 10;		/* MAX number of SLCAN channels;
-				   This can be overridden with
-				   insmod slcan.ko maxdev=nnn	*/
+				 * This can be overridden with
+				 * insmod slcan.ko maxdev=nnn
+				 */
 module_param(maxdev, int, 0);
 MODULE_PARM_DESC(maxdev, "Maximum number of slcan interfaces");
 
 /* maximum rx buffer len: extended CAN frame with timestamp */
-#define SLC_MTU (sizeof("T1111222281122334455667788EA5F\r")+1)
+#define SLC_MTU (sizeof("T1111222281122334455667788EA5F\r") + 1)
 
 #define SLC_CMD_LEN 1
 #define SLC_SFF_ID_LEN 3
@@ -139,12 +140,11 @@ int slcan_enable_err_rst_on_open(struct net_device *ndev, bool on)
 	return 0;
 }
 
- /************************************************************************
-  *			SLCAN ENCAPSULATION FORMAT			 *
-  ************************************************************************/
+/*************************************************************************
+ *			SLCAN ENCAPSULATION FORMAT			 *
+ *************************************************************************/
 
-/*
- * A CAN frame has a can_id (11 bit standard frame format OR 29 bit extended
+/* A CAN frame has a can_id (11 bit standard frame format OR 29 bit extended
  * frame format) a data length code (len) which can be from 0 to 8
  * and up to <len> data bytes as payload.
  * Additionally a CAN frame may become a remote transmission frame if the
@@ -174,9 +174,9 @@ int slcan_enable_err_rst_on_open(struct net_device *ndev, bool on)
  *
  */
 
- /************************************************************************
-  *			STANDARD SLCAN DECAPSULATION			 *
-  ************************************************************************/
+/*************************************************************************
+ *			STANDARD SLCAN DECAPSULATION			 *
+ *************************************************************************/
 
 /* Send one completely decapsulated can_frame to the network layer */
 static void slc_bump_frame(struct slcan *sl)
@@ -469,26 +469,26 @@ static void slcan_unesc(struct slcan *sl, unsigned char s)
 {
 	if ((s == '\r') || (s == '\a')) { /* CR or BEL ends the pdu */
 		if (!test_and_clear_bit(SLF_ERROR, &sl->flags) &&
-		    (sl->rcount > 4))  {
+		    sl->rcount > 4)
 			slc_bump(sl);
-		}
+
 		sl->rcount = 0;
 	} else {
 		if (!test_bit(SLF_ERROR, &sl->flags))  {
 			if (sl->rcount < SLC_MTU)  {
 				sl->rbuff[sl->rcount++] = s;
 				return;
-			} else {
-				sl->dev->stats.rx_over_errors++;
-				set_bit(SLF_ERROR, &sl->flags);
 			}
+
+			sl->dev->stats.rx_over_errors++;
+			set_bit(SLF_ERROR, &sl->flags);
 		}
 	}
 }
 
- /************************************************************************
-  *			STANDARD SLCAN ENCAPSULATION			 *
-  ************************************************************************/
+/*************************************************************************
+ *			STANDARD SLCAN ENCAPSULATION			 *
+ *************************************************************************/
 
 /* Encapsulate one can_frame and stuff into a TTY queue. */
 static void slc_encaps(struct slcan *sl, struct can_frame *cf)
@@ -575,7 +575,8 @@ static void slcan_transmit(struct work_struct *work)
 		}
 
 		/* Now serial buffer is almost free & we can start
-		 * transmission of another packet */
+		 * transmission of another packet
+		 */
 		sl->dev->stats.tx_packets++;
 		clear_bit(TTY_DO_WRITE_WAKEUP, &sl->tty->flags);
 		spin_unlock_bh(&sl->lock);
@@ -589,8 +590,7 @@ static void slcan_transmit(struct work_struct *work)
 	spin_unlock_bh(&sl->lock);
 }
 
-/*
- * Called by the driver when there's room for more data.
+/* Called by the driver when there's room for more data.
  * Schedule the transmit.
  */
 static void slcan_write_wakeup(struct tty_struct *tty)
@@ -618,13 +618,13 @@ static netdev_tx_t slc_xmit(struct sk_buff *skb, struct net_device *dev)
 		netdev_warn(dev, "xmit: iface is down\n");
 		goto out;
 	}
-	if (sl->tty == NULL) {
+	if (!sl->tty) {
 		spin_unlock(&sl->lock);
 		goto out;
 	}
 
 	netif_stop_queue(sl->dev);
-	slc_encaps(sl, (struct can_frame *) skb->data); /* encaps & send */
+	slc_encaps(sl, (struct can_frame *)skb->data); /* encaps & send */
 	spin_unlock(&sl->lock);
 
 out:
@@ -632,7 +632,6 @@ static netdev_tx_t slc_xmit(struct sk_buff *skb, struct net_device *dev)
 	return NETDEV_TX_OK;
 }
 
-
 /******************************************
  *   Routines looking at netdevice side.
  ******************************************/
@@ -708,7 +707,7 @@ static int slc_open(struct net_device *dev)
 	unsigned char cmd[SLC_MTU];
 	int err, s;
 
-	if (sl->tty == NULL)
+	if (!sl->tty)
 		return -ENODEV;
 
 	/* The baud rate is not set with the command
@@ -736,7 +735,6 @@ static int slc_open(struct net_device *dev)
 		/* The CAN framework has already validate the bitrate value,
 		 * so we can avoid to check if `s' has been properly set.
 		 */
-
 		snprintf(cmd, sizeof(cmd), "C\rS%d\r", s);
 		err = slcan_transmit_cmd(sl, cmd);
 		if (err) {
@@ -792,23 +790,21 @@ static const struct net_device_ops slc_netdev_ops = {
 };
 
 /******************************************
-  Routines looking at TTY side.
+ *  Routines looking at TTY side.
  ******************************************/
 
-/*
- * Handle the 'receiver data ready' interrupt.
+/* Handle the 'receiver data ready' interrupt.
  * This function is called by the 'tty_io' module in the kernel when
  * a block of SLCAN data has been received, which can now be decapsulated
  * and sent on to some IP layer for further processing. This will not
  * be re-entered while running but other ldisc functions may be called
  * in parallel
  */
-
 static void slcan_receive_buf(struct tty_struct *tty,
 			      const unsigned char *cp, const char *fp,
 			      int count)
 {
-	struct slcan *sl = (struct slcan *) tty->disc_data;
+	struct slcan *sl = (struct slcan *)tty->disc_data;
 
 	if (!sl || sl->magic != SLCAN_MAGIC || !netif_running(sl->dev))
 		return;
@@ -838,7 +834,7 @@ static void slc_sync(void)
 
 	for (i = 0; i < maxdev; i++) {
 		dev = slcan_devs[i];
-		if (dev == NULL)
+		if (!dev)
 			break;
 
 		sl = netdev_priv(dev);
@@ -858,9 +854,8 @@ static struct slcan *slc_alloc(void)
 
 	for (i = 0; i < maxdev; i++) {
 		dev = slcan_devs[i];
-		if (dev == NULL)
+		if (!dev)
 			break;
-
 	}
 
 	/* Sorry, too many, all slots in use */
@@ -890,8 +885,7 @@ static struct slcan *slc_alloc(void)
 	return sl;
 }
 
-/*
- * Open the high-level part of the SLCAN channel.
+/* Open the high-level part of the SLCAN channel.
  * This function is called by the TTY module when the
  * SLCAN line discipline is called for.  Because we are
  * sure the tty line exists, we only have to link it to
@@ -899,7 +893,6 @@ static struct slcan *slc_alloc(void)
  *
  * Called in process context serialized from other ldisc calls.
  */
-
 static int slcan_open(struct tty_struct *tty)
 {
 	struct slcan *sl;
@@ -908,12 +901,12 @@ static int slcan_open(struct tty_struct *tty)
 	if (!capable(CAP_NET_ADMIN))
 		return -EPERM;
 
-	if (tty->ops->write == NULL)
+	if (!tty->ops->write)
 		return -EOPNOTSUPP;
 
 	/* RTnetlink lock is misused here to serialize concurrent
-	   opens of slcan channels. There are better ways, but it is
-	   the simplest one.
+	 * opens of slcan channels. There are better ways, but it is
+	 * the simplest one.
 	 */
 	rtnl_lock();
 
@@ -930,7 +923,7 @@ static int slcan_open(struct tty_struct *tty)
 	/* OK.  Find a free SLCAN channel to use. */
 	err = -ENFILE;
 	sl = slc_alloc();
-	if (sl == NULL)
+	if (!sl)
 		goto err_exit;
 
 	sl->tty = tty;
@@ -974,17 +967,15 @@ static int slcan_open(struct tty_struct *tty)
 	return err;
 }
 
-/*
- * Close down a SLCAN channel.
+/* Close down a SLCAN channel.
  * This means flushing out any pending queues, and then returning. This
  * call is serialized against other ldisc functions.
  *
  * We also use this method for a hangup event.
  */
-
 static void slcan_close(struct tty_struct *tty)
 {
-	struct slcan *sl = (struct slcan *) tty->disc_data;
+	struct slcan *sl = (struct slcan *)tty->disc_data;
 
 	/* First make sure we're connected. */
 	if (!sl || sl->magic != SLCAN_MAGIC || sl->tty != tty)
@@ -1014,7 +1005,7 @@ static void slcan_hangup(struct tty_struct *tty)
 static int slcan_ioctl(struct tty_struct *tty, unsigned int cmd,
 		       unsigned long arg)
 {
-	struct slcan *sl = (struct slcan *) tty->disc_data;
+	struct slcan *sl = (struct slcan *)tty->disc_data;
 	unsigned int tmp;
 
 	/* First make sure we're connected. */
@@ -1065,7 +1056,7 @@ static int __init slcan_init(void)
 	/* Fill in our line protocol discipline, and register it */
 	status = tty_register_ldisc(&slc_ldisc);
 	if (status)  {
-		printk(KERN_ERR "slcan: can't register line discipline\n");
+		pr_err("slcan: can't register line discipline\n");
 		kfree(slcan_devs);
 	}
 	return status;
@@ -1079,7 +1070,7 @@ static void __exit slcan_exit(void)
 	unsigned long timeout = jiffies + HZ;
 	int busy = 0;
 
-	if (slcan_devs == NULL)
+	if (!slcan_devs)
 		return;
 
 	/* First of all: check for active disciplines and hangup them.
@@ -1104,7 +1095,8 @@ static void __exit slcan_exit(void)
 	} while (busy && time_before(jiffies, timeout));
 
 	/* FIXME: hangup is async so we should wait when doing this second
-	   phase */
+	 * phase
+	 */
 
 	for (i = 0; i < maxdev; i++) {
 		dev = slcan_devs[i];
@@ -1112,9 +1104,8 @@ static void __exit slcan_exit(void)
 			continue;
 
 		sl = netdev_priv(dev);
-		if (sl->tty) {
+		if (sl->tty)
 			netdev_err(dev, "tty discipline still running\n");
-		}
 
 		slc_close(dev);
 		unregister_candev(dev);