3 files changed, 22 insertions, 14 deletions

diff --git a/drivers/char/synclink.c b/drivers/char/synclink.c
index dbbd998ae103..4fbfff7a442e 100644
--- a/drivers/char/synclink.c
+++ b/drivers/char/synclink.c
@@ -2026,10 +2026,11 @@ static void mgsl_change_params(struct mgsl_struct *info)
  *              
  * Return Value:        None
  */
-static void mgsl_put_char(struct tty_struct *tty, unsigned char ch)
+static int mgsl_put_char(struct tty_struct *tty, unsigned char ch)
 {
         struct mgsl_struct *info = (struct mgsl_struct *)tty->driver_data;
         unsigned long flags;
+        int ret;
 
         if ( debug_level >= DEBUG_LEVEL_INFO ) {
                 printk( "%s(%d):mgsl_put_char(%d) on %s\n",
@@ -2037,23 +2038,23 @@ static void mgsl_put_char(struct tty_struct *tty, unsigned char ch)
         }               
         
         if (mgsl_paranoia_check(info, tty->name, "mgsl_put_char"))
-                return;
+                return 0;
 
         if (!tty || !info->xmit_buf)
-                return;
+                return 0;
 
         spin_lock_irqsave(&info->irq_spinlock,flags);
         
         if ( (info->params.mode == MGSL_MODE_ASYNC ) || !info->tx_active ) {
-        
                 if (info->xmit_cnt < SERIAL_XMIT_SIZE - 1) {
                         info->xmit_buf[info->xmit_head++] = ch;
                         info->xmit_head &= SERIAL_XMIT_SIZE-1;
                         info->xmit_cnt++;
+                        ret = 1;
                 }
         }
-        
         spin_unlock_irqrestore(&info->irq_spinlock,flags);
+        return ret;
         
 }       /* end of mgsl_put_char() */
 
diff --git a/drivers/char/synclink_gt.c b/drivers/char/synclink_gt.c
index 1a11717b1adc..430f5bc0ae30 100644
--- a/drivers/char/synclink_gt.c
+++ b/drivers/char/synclink_gt.c
@@ -151,7 +151,7 @@ static void hangup(struct tty_struct *tty);
 static void set_termios(struct tty_struct *tty, struct ktermios *old_termios);
 
 static int  write(struct tty_struct *tty, const unsigned char *buf, int count);
-static void put_char(struct tty_struct *tty, unsigned char ch);
+static int put_char(struct tty_struct *tty, unsigned char ch);
 static void send_xchar(struct tty_struct *tty, char ch);
 static void wait_until_sent(struct tty_struct *tty, int timeout);
 static int  write_room(struct tty_struct *tty);
@@ -912,20 +912,24 @@ cleanup:
         return ret;
 }
 
-static void put_char(struct tty_struct *tty, unsigned char ch)
+static int put_char(struct tty_struct *tty, unsigned char ch)
 {
         struct slgt_info *info = tty->driver_data;
         unsigned long flags;
+        int ret;
 
         if (sanity_check(info, tty->name, "put_char"))
-                return;
+                return 0;
         DBGINFO(("%s put_char(%d)\n", info->device_name, ch));
         if (!info->tx_buf)
-                return;
+                return 0;
         spin_lock_irqsave(&info->lock,flags);
-        if (!info->tx_active && (info->tx_count < info->max_frame_size))
+        if (!info->tx_active && (info->tx_count < info->max_frame_size)) {
                 info->tx_buf[info->tx_count++] = ch;
+                ret = 1;
+        }
         spin_unlock_irqrestore(&info->lock,flags);
+        return ret;
 }
 
 static void send_xchar(struct tty_struct *tty, char ch)
diff --git a/drivers/char/synclinkmp.c b/drivers/char/synclinkmp.c
index 2f1988c48ee3..a624ffd7baaa 100644
--- a/drivers/char/synclinkmp.c
+++ b/drivers/char/synclinkmp.c
@@ -519,7 +519,7 @@ static void hangup(struct tty_struct *tty);
 static void set_termios(struct tty_struct *tty, struct ktermios *old_termios);
 
 static int  write(struct tty_struct *tty, const unsigned char *buf, int count);
-static void put_char(struct tty_struct *tty, unsigned char ch);
+static int put_char(struct tty_struct *tty, unsigned char ch);
 static void send_xchar(struct tty_struct *tty, char ch);
 static void wait_until_sent(struct tty_struct *tty, int timeout);
 static int  write_room(struct tty_struct *tty);
@@ -1045,10 +1045,11 @@ cleanup:
 
 /* Add a character to the transmit buffer.
  */
-static void put_char(struct tty_struct *tty, unsigned char ch)
+static int put_char(struct tty_struct *tty, unsigned char ch)
 {
         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
         unsigned long flags;
+        int ret = 0;
 
         if ( debug_level >= DEBUG_LEVEL_INFO ) {
                 printk( "%s(%d):%s put_char(%d)\n",
@@ -1056,10 +1057,10 @@ static void put_char(struct tty_struct *tty, unsigned char ch)
         }
 
         if (sanity_check(info, tty->name, "put_char"))
-                return;
+                return 0;
 
         if (!info->tx_buf)
-                return;
+                return 0;
 
         spin_lock_irqsave(&info->lock,flags);
 
@@ -1071,10 +1072,12 @@ static void put_char(struct tty_struct *tty, unsigned char ch)
                         if (info->tx_put >= info->max_frame_size)
                                 info->tx_put -= info->max_frame_size;
                         info->tx_count++;
+                        ret = 1;
                 }
         }
 
         spin_unlock_irqrestore(&info->lock,flags);
+        return ret;
 }
 
 /* Send a high-priority XON/XOFF character