tty: remove buf parameter from tty_name()

tty_name no longer uses the buf parameter, so remove it along with all
the 64 byte stack buffers that used to be passed in.

Mostly generated by the coccinelle script

@depends on patch@
identifier buf;
constant C;
expression tty;
@@
- char buf[C];
  <+...
- tty_name(tty, buf)
+ tty_name(tty)
  ...+>

allmodconfig compiles, so I'm fairly confident the stack buffers
weren't used for other purposes as well.
Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Reviewed-by: Peter Hurley <peter@hurleysoftware.com>
Acked-by: Jesper Nilsson <jesper.nilsson@axis.com>
Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/input/serio/serport.c

@@ -167,7 +167,6 @@ static ssize_t serport_ldisc_read(struct tty_struct * tty, struct file * file, u
 {
 	struct serport *serport = (struct serport*) tty->disc_data;
 	struct serio *serio;
-	char name[64];
 
 	if (test_and_set_bit(SERPORT_BUSY, &serport->flags))
 		return -EBUSY;
@@ -177,7 +176,7 @@ static ssize_t serport_ldisc_read(struct tty_struct * tty, struct file * file, u
 		return -ENOMEM;
 
 	strlcpy(serio->name, "Serial port", sizeof(serio->name));
-	snprintf(serio->phys, sizeof(serio->phys), "%s/serio0", tty_name(tty, name));
+	snprintf(serio->phys, sizeof(serio->phys), "%s/serio0", tty_name(tty));
 	serio->id = serport->id;
 	serio->id.type = SERIO_RS232;
 	serio->write = serport_serio_write;
@@ -187,7 +186,7 @@ static ssize_t serport_ldisc_read(struct tty_struct * tty, struct file * file, u
 	serio->dev.parent = tty->dev;
 
 	serio_register_port(serport->serio);
-	printk(KERN_INFO "serio: Serial port %s\n", tty_name(tty, name));
+	printk(KERN_INFO "serio: Serial port %s\n", tty_name(tty));
 
 	wait_event_interruptible(serport->wait, test_bit(SERPORT_DEAD, &serport->flags));
 	serio_unregister_port(serport->serio);

drivers/tty/amiserial.c

@@ -966,9 +966,7 @@ static void rs_throttle(struct tty_struct * tty)
 	struct serial_state *info = tty->driver_data;
 	unsigned long flags;
 #ifdef SERIAL_DEBUG_THROTTLE
-	char	buf[64];
-
-	printk("throttle %s: %d....\n", tty_name(tty, buf),
+	printk("throttle %s: %d....\n", tty_name(tty),
 	       tty->ldisc.chars_in_buffer(tty));
 #endif
 
@@ -991,9 +989,7 @@ static void rs_unthrottle(struct tty_struct * tty)
 	struct serial_state *info = tty->driver_data;
 	unsigned long flags;
 #ifdef SERIAL_DEBUG_THROTTLE
-	char	buf[64];
-
-	printk("unthrottle %s: %d....\n", tty_name(tty, buf),
+	printk("unthrottle %s: %d....\n", tty_name(tty),
 	       tty->ldisc.chars_in_buffer(tty));
 #endif
 

drivers/tty/cyclades.c

@@ -2861,9 +2861,7 @@ static void cy_throttle(struct tty_struct *tty)
 	unsigned long flags;
 
 #ifdef CY_DEBUG_THROTTLE
-	char buf[64];
-
-	printk(KERN_DEBUG "cyc:throttle %s: %ld...ttyC%d\n", tty_name(tty, buf),
+	printk(KERN_DEBUG "cyc:throttle %s: %ld...ttyC%d\n", tty_name(tty),
 			tty->ldisc.chars_in_buffer(tty), info->line);
 #endif
 
@@ -2902,10 +2900,8 @@ static void cy_unthrottle(struct tty_struct *tty)
 	unsigned long flags;
 
 #ifdef CY_DEBUG_THROTTLE
-	char buf[64];
-
 	printk(KERN_DEBUG "cyc:unthrottle %s: %ld...ttyC%d\n",
-		tty_name(tty, buf), tty_chars_in_buffer(tty), info->line);
+		tty_name(tty), tty_chars_in_buffer(tty), info->line);
 #endif
 
 	if (serial_paranoia_check(info, tty->name, "cy_unthrottle"))

drivers/tty/n_gsm.c

@@ -2274,7 +2274,6 @@ static void gsmld_receive_buf(struct tty_struct *tty, const unsigned char *cp,
 	const unsigned char *dp;
 	char *f;
 	int i;
-	char buf[64];
 	char flags = TTY_NORMAL;
 
 	if (debug & 4)
@@ -2296,7 +2295,7 @@ static void gsmld_receive_buf(struct tty_struct *tty, const unsigned char *cp,
 			break;
 		default:
 			WARN_ONCE(1, "%s: unknown flag %d\n",
-			       tty_name(tty, buf), flags);
+			       tty_name(tty), flags);
 			break;
 		}
 	}

drivers/tty/n_tty.c

@@ -1179,13 +1179,12 @@ static void n_tty_receive_break(struct tty_struct *tty)
 static void n_tty_receive_overrun(struct tty_struct *tty)
 {
 	struct n_tty_data *ldata = tty->disc_data;
-	char buf[64];
 
 	ldata->num_overrun++;
 	if (time_after(jiffies, ldata->overrun_time + HZ) ||
 			time_after(ldata->overrun_time, jiffies)) {
 		printk(KERN_WARNING "%s: %d input overrun(s)\n",
-			tty_name(tty, buf),
+			tty_name(tty),
 			ldata->num_overrun);
 		ldata->overrun_time = jiffies;
 		ldata->num_overrun = 0;
@@ -1460,8 +1459,6 @@ static void n_tty_receive_char_closing(struct tty_struct *tty, unsigned char c)
 static void
 n_tty_receive_char_flagged(struct tty_struct *tty, unsigned char c, char flag)
 {
-	char buf[64];
-
 	switch (flag) {
 	case TTY_BREAK:
 		n_tty_receive_break(tty);
@@ -1475,7 +1472,7 @@ n_tty_receive_char_flagged(struct tty_struct *tty, unsigned char c, char flag)
 		break;
 	default:
 		printk(KERN_ERR "%s: unknown flag %d\n",
-		       tty_name(tty, buf), flag);
+		       tty_name(tty), flag);
 		break;
 	}
 }

drivers/tty/serial/crisv10.c

@@ -3216,9 +3216,7 @@ rs_throttle(struct tty_struct * tty)
 {
 	struct e100_serial *info = (struct e100_serial *)tty->driver_data;
 #ifdef SERIAL_DEBUG_THROTTLE
-	char	buf[64];
-
-	printk("throttle %s: %lu....\n", tty_name(tty, buf),
+	printk("throttle %s: %lu....\n", tty_name(tty),
 	       (unsigned long)tty->ldisc.chars_in_buffer(tty));
 #endif
 	DFLOW(DEBUG_LOG(info->line,"rs_throttle %lu\n", tty->ldisc.chars_in_buffer(tty)));
@@ -3238,9 +3236,7 @@ rs_unthrottle(struct tty_struct * tty)
 {
 	struct e100_serial *info = (struct e100_serial *)tty->driver_data;
 #ifdef SERIAL_DEBUG_THROTTLE
-	char	buf[64];
-
-	printk("unthrottle %s: %lu....\n", tty_name(tty, buf),
+	printk("unthrottle %s: %lu....\n", tty_name(tty),
 	       (unsigned long)tty->ldisc.chars_in_buffer(tty));
 #endif
 	DFLOW(DEBUG_LOG(info->line,"rs_unthrottle ldisc %d\n", tty->ldisc.chars_in_buffer(tty)));

drivers/tty/serial/serial_core.c

@@ -894,12 +894,10 @@ static int uart_set_info(struct tty_struct *tty, struct tty_port *port,
 			 * need to rate-limit; it's CAP_SYS_ADMIN only.
 			 */
 			if (uport->flags & UPF_SPD_MASK) {
-				char buf[64];
-
 				dev_notice(uport->dev,
 				       "%s sets custom speed on %s. This is deprecated.\n",
 				      current->comm,
-				      tty_name(port->tty, buf));
+				      tty_name(port->tty));
 			}
 			uart_change_speed(tty, state, NULL);
 		}

drivers/tty/tty_io.c

@@ -235,7 +235,6 @@ static void tty_del_file(struct file *file)
 /**
  *	tty_name	-	return tty naming
  *	@tty: tty structure
- *	@buf: unused
  *
  *	Convert a tty structure into a name. The name reflects the kernel
  *	naming policy and if udev is in use may not reflect user space
@@ -243,7 +242,7 @@ static void tty_del_file(struct file *file)
  *	Locking: none
  */
 
-const char *tty_name(const struct tty_struct *tty, char *buf)
+const char *tty_name(const struct tty_struct *tty)
 {
 	if (!tty) /* Hmm.  NULL pointer.  That's fun. */
 		return "NULL tty";
@@ -768,8 +767,7 @@ static void do_tty_hangup(struct work_struct *work)
 void tty_hangup(struct tty_struct *tty)
 {
 #ifdef TTY_DEBUG_HANGUP
-	char	buf[64];
-	printk(KERN_DEBUG "%s hangup...\n", tty_name(tty, buf));
+	printk(KERN_DEBUG "%s hangup...\n", tty_name(tty));
 #endif
 	schedule_work(&tty->hangup_work);
 }
@@ -788,9 +786,7 @@ EXPORT_SYMBOL(tty_hangup);
 void tty_vhangup(struct tty_struct *tty)
 {
 #ifdef TTY_DEBUG_HANGUP
-	char	buf[64];
-
-	printk(KERN_DEBUG "%s vhangup...\n", tty_name(tty, buf));
+	printk(KERN_DEBUG "%s vhangup...\n", tty_name(tty));
 #endif
 	__tty_hangup(tty, 0);
 }
@@ -829,9 +825,7 @@ void tty_vhangup_self(void)
 static void tty_vhangup_session(struct tty_struct *tty)
 {
 #ifdef TTY_DEBUG_HANGUP
-	char	buf[64];
-
-	printk(KERN_DEBUG "%s vhangup session...\n", tty_name(tty, buf));
+	printk(KERN_DEBUG "%s vhangup session...\n", tty_name(tty));
 #endif
 	__tty_hangup(tty, 1);
 }
@@ -1767,7 +1761,6 @@ int tty_release(struct inode *inode, struct file *filp)
 	struct tty_struct *o_tty = NULL;
 	int	do_sleep, final;
 	int	idx;
-	char	buf[64];
 	long	timeout = 0;
 	int	once = 1;
 
@@ -1791,7 +1784,7 @@ int tty_release(struct inode *inode, struct file *filp)
 
 #ifdef TTY_DEBUG_HANGUP
 	printk(KERN_DEBUG "%s: %s (tty count=%d)...\n", __func__,
-			tty_name(tty, buf), tty->count);
+			tty_name(tty), tty->count);
 #endif
 
 	if (tty->ops->close)
@@ -1842,7 +1835,7 @@ int tty_release(struct inode *inode, struct file *filp)
 		if (once) {
 			once = 0;
 			printk(KERN_WARNING "%s: %s: read/write wait queue active!\n",
-			       __func__, tty_name(tty, buf));
+			       __func__, tty_name(tty));
 		}
 		schedule_timeout_killable(timeout);
 		if (timeout < 120 * HZ)
@@ -1854,13 +1847,13 @@ int tty_release(struct inode *inode, struct file *filp)
 	if (o_tty) {
 		if (--o_tty->count < 0) {
 			printk(KERN_WARNING "%s: bad pty slave count (%d) for %s\n",
-				__func__, o_tty->count, tty_name(o_tty, buf));
+				__func__, o_tty->count, tty_name(o_tty));
 			o_tty->count = 0;
 		}
 	}
 	if (--tty->count < 0) {
 		printk(KERN_WARNING "%s: bad tty->count (%d) for %s\n",
-				__func__, tty->count, tty_name(tty, buf));
+				__func__, tty->count, tty_name(tty));
 		tty->count = 0;
 	}
 
@@ -1903,7 +1896,7 @@ int tty_release(struct inode *inode, struct file *filp)
 		return 0;
 
 #ifdef TTY_DEBUG_HANGUP
-	printk(KERN_DEBUG "%s: %s: final close\n", __func__, tty_name(tty, buf));
+	printk(KERN_DEBUG "%s: %s: final close\n", __func__, tty_name(tty));
 #endif
 	/*
 	 * Ask the line discipline code to release its structures
@@ -1914,7 +1907,8 @@ int tty_release(struct inode *inode, struct file *filp)
 	tty_flush_works(tty);
 
 #ifdef TTY_DEBUG_HANGUP
-	printk(KERN_DEBUG "%s: %s: freeing structure...\n", __func__, tty_name(tty, buf));
+	printk(KERN_DEBUG "%s: %s: freeing structure...\n", __func__,
+	       tty_name(tty));
 #endif
 	/*
 	 * The release_tty function takes care of the details of clearing

drivers/tty/tty_ioctl.c

@@ -211,9 +211,7 @@ int tty_unthrottle_safe(struct tty_struct *tty)
 void tty_wait_until_sent(struct tty_struct *tty, long timeout)
 {
 #ifdef TTY_DEBUG_WAIT_UNTIL_SENT
-	char buf[64];
-
-	printk(KERN_DEBUG "%s wait until sent...\n", tty_name(tty, buf));
+	printk(KERN_DEBUG "%s wait until sent...\n", tty_name(tty));
 #endif
 	if (!timeout)
 		timeout = MAX_SCHEDULE_TIMEOUT;

drivers/tty/tty_ldisc.c

@@ -22,9 +22,8 @@
 #undef LDISC_DEBUG_HANGUP
 
 #ifdef LDISC_DEBUG_HANGUP
-#define tty_ldisc_debug(tty, f, args...) ({				       \
-	char __b[64];							       \
-	printk(KERN_DEBUG "%s: %s: " f, __func__, tty_name(tty, __b), ##args); \
+#define tty_ldisc_debug(tty, f, args...) ({				  \
+	printk(KERN_DEBUG "%s: %s: " f, __func__, tty_name(tty), ##args); \
 })
 #else
 #define tty_ldisc_debug(tty, f, args...)
@@ -483,7 +482,6 @@ static void tty_ldisc_close(struct tty_struct *tty, struct tty_ldisc *ld)
 
 static void tty_ldisc_restore(struct tty_struct *tty, struct tty_ldisc *old)
 {
-	char buf[64];
 	struct tty_ldisc *new_ldisc;
 	int r;
 
@@ -504,7 +502,7 @@ static void tty_ldisc_restore(struct tty_struct *tty, struct tty_ldisc *old)
 		if (r < 0)
 			panic("Couldn't open N_TTY ldisc for "
 			      "%s --- error %d.",
-			      tty_name(tty, buf), r);
+			      tty_name(tty), r);
 	}
 }
 

include/linux/tty.h

@@ -421,7 +421,7 @@ static inline struct tty_struct *tty_kref_get(struct tty_struct *tty)
 
 extern int tty_paranoia_check(struct tty_struct *tty, struct inode *inode,
 			      const char *routine);
-extern const char *tty_name(const struct tty_struct *tty, char *buf);
+extern const char *tty_name(const struct tty_struct *tty);
 extern void tty_wait_until_sent(struct tty_struct *tty, long timeout);
 extern int tty_check_change(struct tty_struct *tty);
 extern void __stop_tty(struct tty_struct *tty);