char: switch gs, cyclades and esp to return int for put_char

Signed-off-by: Alan Cox <alan@redhat.com>
Cc: Jiri Slaby <jirislaby@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

4 files changed, 18 insertions, 13 deletions

diff --git a/drivers/char/cyclades.c b/drivers/char/cyclades.c
index 571e4fab5bfa..b8fb251f80ee 100644
--- a/drivers/char/cyclades.c
+++ b/drivers/char/cyclades.c
@@ -2814,7 +2814,7 @@ static int cy_write(struct tty_struct *tty, const unsigned char *buf, int count)
  * done stuffing characters into the driver.  If there is no room
  * in the queue, the character is ignored.
  */
-static void cy_put_char(struct tty_struct *tty, unsigned char ch)
+static int cy_put_char(struct tty_struct *tty, unsigned char ch)
 {
         struct cyclades_port *info = tty->driver_data;
         unsigned long flags;
@@ -2824,15 +2824,15 @@ static void cy_put_char(struct tty_struct *tty, unsigned char ch)
 #endif
 
         if (serial_paranoia_check(info, tty->name, "cy_put_char"))
-                return;
+                return 0;
 
         if (!info->xmit_buf)
-                return;
+                return 0;
 
         spin_lock_irqsave(&info->card->card_lock, flags);
         if (info->xmit_cnt >= (int)(SERIAL_XMIT_SIZE - 1)) {
                 spin_unlock_irqrestore(&info->card->card_lock, flags);
-                return;
+                return 0;
         }
 
         info->xmit_buf[info->xmit_head++] = ch;
@@ -2841,6 +2841,7 @@ static void cy_put_char(struct tty_struct *tty, unsigned char ch)
         info->idle_stats.xmit_bytes++;
         info->idle_stats.xmit_idle = jiffies;
         spin_unlock_irqrestore(&info->card->card_lock, flags);
+        return 1;
 }                               /* cy_put_char */
 
 /*
diff --git a/drivers/char/esp.c b/drivers/char/esp.c
index b1f92db31331..996d3230c929 100644
--- a/drivers/char/esp.c
+++ b/drivers/char/esp.c
@@ -1156,24 +1156,27 @@ static void change_speed(struct esp_struct *info)
         spin_unlock_irqrestore(&info->lock, flags);
 }
 
-static void rs_put_char(struct tty_struct *tty, unsigned char ch)
+static int rs_put_char(struct tty_struct *tty, unsigned char ch)
 {
         struct esp_struct *info = (struct esp_struct *)tty->driver_data;
         unsigned long flags;
+        int ret = 0;
 
         if (serial_paranoia_check(info, tty->name, "rs_put_char"))
-                return;
+                return 0;
 
         if (!info->xmit_buf)
-                return;
+                return 0;
 
         spin_lock_irqsave(&info->lock, flags);
         if (info->xmit_cnt < ESP_XMIT_SIZE - 1) {
                 info->xmit_buf[info->xmit_head++] = ch;
                 info->xmit_head &= ESP_XMIT_SIZE-1;
                 info->xmit_cnt++;
+                ret = 1;
         }
         spin_unlock_irqrestore(&info->lock, flags);
+        return ret;
 }
 
 static void rs_flush_chars(struct tty_struct *tty)
diff --git a/drivers/char/generic_serial.c b/drivers/char/generic_serial.c
index f6610f28d657..149518e22fa6 100644
--- a/drivers/char/generic_serial.c
+++ b/drivers/char/generic_serial.c
@@ -48,19 +48,19 @@ static int gs_debug;
 module_param(gs_debug, int, 0644);
 
 
-void gs_put_char(struct tty_struct * tty, unsigned char ch)
+int gs_put_char(struct tty_struct * tty, unsigned char ch)
 {
         struct gs_port *port;
 
         func_enter (); 
 
-        if (!tty) return;
+        if (!tty) return 0;
 
         port = tty->driver_data;
 
-        if (!port) return;
+        if (!port) return 0;
 
-        if (! (port->flags & ASYNC_INITIALIZED)) return;
+        if (! (port->flags & ASYNC_INITIALIZED)) return 0;
 
         /* Take a lock on the serial tranmit buffer! */
         mutex_lock(& port->port_write_mutex);
@@ -68,7 +68,7 @@ void gs_put_char(struct tty_struct * tty, unsigned char ch)
         if (port->xmit_cnt >= SERIAL_XMIT_SIZE - 1) {
                 /* Sorry, buffer is full, drop character. Update statistics???? -- REW */
                 mutex_unlock(&port->port_write_mutex);
-                return;
+                return 0;
         }
 
         port->xmit_buf[port->xmit_head++] = ch;
@@ -77,6 +77,7 @@ void gs_put_char(struct tty_struct * tty, unsigned char ch)
 
         mutex_unlock(&port->port_write_mutex);
         func_exit ();
+        return 1;
 }
 
 
diff --git a/include/linux/generic_serial.h b/include/linux/generic_serial.h
index 5412da28fa47..110833666e37 100644
--- a/include/linux/generic_serial.h
+++ b/include/linux/generic_serial.h
@@ -78,7 +78,7 @@ struct gs_port {
 #define GS_DEBUG_WRITE   0x00000040
 
 #ifdef __KERNEL__
-void gs_put_char(struct tty_struct *tty, unsigned char ch);
+int gs_put_char(struct tty_struct *tty, unsigned char ch);
 int  gs_write(struct tty_struct *tty, 
              const unsigned char *buf, int count);
 int  gs_write_room(struct tty_struct *tty);