linux-kernel - [RFC] usb: gadget: serial: remove PREFIX macro

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Date:	Fri, 18 Jul 2014 11:39:46 +0200
From:	Richard Leitner <richard.leitner@...data.com>
To:	<balbi@...com>, <gregkh@...uxfoundation.org>
CC:	<linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: [RFC] usb: gadget: serial: remove PREFIX macro

Remove the ttyGS PREFIX macro from u_serial.c and replace all occurences with
the hardcoded ttyGS string.

This macro was mostly used in a few debug/warning messages and a lot of
hardcoded ttyGS existed beneath. It may have been used for renaming the
tty, but if done so most debug messages would have ignored this because
of the hardcoded strings.

Due to the fact the usage of this PREFIX instead of the hardcoded strings
in all debug calls would have resulted in a hard to read/grep code it
is removed completely.

Signed-off-by: Richard Leitner <richard.leitner@...data.com>
---
note: previous discussion was at https://lkml.org/lkml/2014/6/27/193
---
 drivers/usb/gadget/u_serial.c |   21 +++++++++------------
 1 file changed, 9 insertions(+), 12 deletions(-)

diff --git a/drivers/usb/gadget/u_serial.c b/drivers/usb/gadget/u_serial.c
index ad0aca8..7e7a6b0 100644
--- a/drivers/usb/gadget/u_serial.c
+++ b/drivers/usb/gadget/u_serial.c
@@ -55,11 +55,8 @@
  * for a telephone or fax link.  And ttyGS2 might be something that just
  * needs a simple byte stream interface for some messaging protocol that
  * is managed in userspace ... OBEX, PTP, and MTP have been mentioned.
- */
-
-#define PREFIX	"ttyGS"
-
-/*
+ *
+ *
  * gserial is the lifecycle interface, used by USB functions
  * gs_port is the I/O nexus, used by the tty driver
  * tty_struct links to the tty/filesystem framework
@@ -385,7 +382,7 @@ __acquires(&port->port_lock)
 		list_del(&req->list);
 		req->zero = (gs_buf_data_avail(&port->port_write_buf) == 0);
 
-		pr_vdebug(PREFIX "%d: tx len=%d, 0x%02x 0x%02x 0x%02x ...\n",
+		pr_vdebug("ttyGS%d: tx len=%d, 0x%02x 0x%02x 0x%02x ...\n",
 				port->port_num, len, *((u8 *)req->buf),
 				*((u8 *)req->buf+1), *((u8 *)req->buf+2));
 
@@ -503,12 +500,12 @@ static void gs_rx_push(unsigned long _port)
 		switch (req->status) {
 		case -ESHUTDOWN:
 			disconnect = true;
-			pr_vdebug(PREFIX "%d: shutdown\n", port->port_num);
+			pr_vdebug("ttyGS%d: shutdown\n", port->port_num);
 			break;
 
 		default:
 			/* presumably a transient fault */
-			pr_warning(PREFIX "%d: unexpected RX status %d\n",
+			pr_warn("ttyGS%d: unexpected RX status %d\n",
 					port->port_num, req->status);
 			/* FALLTHROUGH */
 		case 0:
@@ -537,7 +534,7 @@ static void gs_rx_push(unsigned long _port)
 			if (count != size) {
 				/* stop pushing; TTY layer can't handle more */
 				port->n_read += count;
-				pr_vdebug(PREFIX "%d: rx block %d/%d\n",
+				pr_vdebug("ttyGS%d: rx block %d/%d\n",
 						port->port_num,
 						count, req->actual);
 				break;
@@ -569,7 +566,7 @@ static void gs_rx_push(unsigned long _port)
 			if (do_push)
 				tasklet_schedule(&port->push);
 			else
-				pr_warning(PREFIX "%d: RX not scheduled?\n",
+				pr_warn("ttyGS%d: RX not scheduled?\n",
 					port->port_num);
 		}
 	}
@@ -985,7 +982,7 @@ static void gs_unthrottle(struct tty_struct *tty)
 		 * read queue backs up enough we'll be NAKing OUT packets.
 		 */
 		tasklet_schedule(&port->push);
-		pr_vdebug(PREFIX "%d: unthrottle\n", port->port_num);
+		pr_vdebug("ttyGS%d: unthrottle\n", port->port_num);
 	}
 	spin_unlock_irqrestore(&port->port_lock, flags);
 }
@@ -1295,7 +1292,7 @@ static int userial_init(void)
 		return -ENOMEM;
 
 	gs_tty_driver->driver_name = "g_serial";
-	gs_tty_driver->name = PREFIX;
+	gs_tty_driver->name = "ttyGS";
 	/* uses dynamically assigned dev_t values */
 
 	gs_tty_driver->type = TTY_DRIVER_TYPE_SERIAL;
-- 
1.7.10.4
--
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