tty: rework break handling

Some hardware needs to do break handling itself and may have partial
support only. Make break_ctl return an error code. Add a tty driver flag
so you can indicate driver hardware side break support.

Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

20 files changed, 97 insertions, 84 deletions

diff --git a/drivers/char/Kconfig b/drivers/char/Kconfig
index ba8782b9c217..a185263b5862 100644
--- a/drivers/char/Kconfig
+++ b/drivers/char/Kconfig
@@ -218,7 +218,7 @@ config MOXA_SMARTIO
 
 config ISI
         tristate "Multi-Tech multiport card support (EXPERIMENTAL)"
-        depends on SERIAL_NONSTANDARD && PCI
+        depends on SERIAL_NONSTANDARD && PCI && BROKEN
         select FW_LOADER
         help
           This is a driver for the Multi-Tech cards which provide several
diff --git a/drivers/char/amiserial.c b/drivers/char/amiserial.c
index 37457e5a4f2b..3530ff417a51 100644
--- a/drivers/char/amiserial.c
+++ b/drivers/char/amiserial.c
@@ -1248,7 +1248,7 @@ static int rs_tiocmset(struct tty_struct *tty, struct file *file,
 /*
  * rs_break() --- routine which turns the break handling on or off
  */
-static void rs_break(struct tty_struct *tty, int break_state)
+static int rs_break(struct tty_struct *tty, int break_state)
 {
         struct async_struct * info = (struct async_struct *)tty->driver_data;
         unsigned long flags;
@@ -1263,6 +1263,7 @@ static void rs_break(struct tty_struct *tty, int break_state)
           custom.adkcon = AC_UARTBRK;
         mb();
         local_irq_restore(flags);
+        return 0;
 }
 
 
diff --git a/drivers/char/cyclades.c b/drivers/char/cyclades.c
index e991dc85f2fb..fe6d774fe2e4 100644
--- a/drivers/char/cyclades.c
+++ b/drivers/char/cyclades.c
@@ -3700,14 +3700,15 @@ cy_tiocmset(struct tty_struct *tty, struct file *file,
 /*
  * cy_break() --- routine which turns the break handling on or off
  */
-static void cy_break(struct tty_struct *tty, int break_state)
+static int cy_break(struct tty_struct *tty, int break_state)
 {
         struct cyclades_port *info = tty->driver_data;
         struct cyclades_card *card;
         unsigned long flags;
+        int retval = 0;
 
         if (serial_paranoia_check(info, tty->name, "cy_break"))
-                return;
+                return -EINVAL;
 
         card = info->card;
 
@@ -3736,8 +3737,6 @@ static void cy_break(struct tty_struct *tty, int break_state)
                         }
                 }
         } else {
-                int retval;
-
                 if (break_state == -1) {
                         retval = cyz_issue_cmd(card,
                                 info->line - card->first_line,
@@ -3758,6 +3757,7 @@ static void cy_break(struct tty_struct *tty, int break_state)
                 }
         }
         spin_unlock_irqrestore(&card->card_lock, flags);
+        return retval;
 }                               /* cy_break */
 
 static int get_mon_info(struct cyclades_port *info,
diff --git a/drivers/char/esp.c b/drivers/char/esp.c
index 2eaf09f93e3d..7f077c0097f6 100644
--- a/drivers/char/esp.c
+++ b/drivers/char/esp.c
@@ -1725,13 +1725,13 @@ static int esp_tiocmset(struct tty_struct *tty, struct file *file,
 /*
  * rs_break() --- routine which turns the break handling on or off
  */
-static void esp_break(struct tty_struct *tty, int break_state)
+static int esp_break(struct tty_struct *tty, int break_state)
 {
         struct esp_struct *info = tty->driver_data;
         unsigned long flags;
 
         if (serial_paranoia_check(info, tty->name, "esp_break"))
-                return;
+                return -EINVAL;
 
         if (break_state == -1) {
                 spin_lock_irqsave(&info->lock, flags);
@@ -1747,6 +1747,7 @@ static void esp_break(struct tty_struct *tty, int break_state)
                 serial_out(info, UART_ESI_CMD2, 0x00);
                 spin_unlock_irqrestore(&info->lock, flags);
         }
+        return 0;
 }
 
 static int rs_ioctl(struct tty_struct *tty, struct file *file,
diff --git a/drivers/char/istallion.c b/drivers/char/istallion.c
index 7930fba4bafc..63d22b5ebc0d 100644
--- a/drivers/char/istallion.c
+++ b/drivers/char/istallion.c
@@ -609,7 +609,7 @@ static void	stli_unthrottle(struct tty_struct *tty);
 static void     stli_stop(struct tty_struct *tty);
 static void     stli_start(struct tty_struct *tty);
 static void     stli_flushbuffer(struct tty_struct *tty);
-static void     stli_breakctl(struct tty_struct *tty, int state);
+static int      stli_breakctl(struct tty_struct *tty, int state);
 static void     stli_waituntilsent(struct tty_struct *tty, int timeout);
 static void     stli_sendxchar(struct tty_struct *tty, char ch);
 static void     stli_hangup(struct tty_struct *tty);
@@ -1909,7 +1909,7 @@ static void stli_flushbuffer(struct tty_struct *tty)
 
 /*****************************************************************************/
 
-static void stli_breakctl(struct tty_struct *tty, int state)
+static int stli_breakctl(struct tty_struct *tty, int state)
 {
         struct stlibrd  *brdp;
         struct stliport *portp;
@@ -1917,15 +1917,16 @@ static void stli_breakctl(struct tty_struct *tty, int state)
 
         portp = tty->driver_data;
         if (portp == NULL)
-                return;
+                return -EINVAL;
         if (portp->brdnr >= stli_nrbrds)
-                return;
+                return -EINVAL;
         brdp = stli_brds[portp->brdnr];
         if (brdp == NULL)
-                return;
+                return -EINVAL;
 
         arg = (state == -1) ? BREAKON : BREAKOFF;
         stli_cmdwait(brdp, portp, A_BREAK, &arg, sizeof(long), 0);
+        return 0;
 }
 
 /*****************************************************************************/
diff --git a/drivers/char/moxa.c b/drivers/char/moxa.c
index 2bba250ffc8e..d3d7864e0c1e 100644
--- a/drivers/char/moxa.c
+++ b/drivers/char/moxa.c
@@ -374,12 +374,13 @@ copy:
         return ret;
 }
 
-static void moxa_break_ctl(struct tty_struct *tty, int state)
+static int moxa_break_ctl(struct tty_struct *tty, int state)
 {
         struct moxa_port *port = tty->driver_data;
 
         moxafunc(port->tableAddr, state ? FC_SendBreak : FC_StopBreak,
                         Magic_code);
+        return 0;
 }
 
 static const struct tty_operations moxa_ops = {
diff --git a/drivers/char/mxser.c b/drivers/char/mxser.c
index 1fb25571bf85..f04c3c58a05a 100644
--- a/drivers/char/mxser.c
+++ b/drivers/char/mxser.c
@@ -2183,7 +2183,7 @@ static void mxser_hangup(struct tty_struct *tty)
 /*
  * mxser_rs_break() --- routine which turns the break handling on or off
  */
-static void mxser_rs_break(struct tty_struct *tty, int break_state)
+static int mxser_rs_break(struct tty_struct *tty, int break_state)
 {
         struct mxser_port *info = tty->driver_data;
         unsigned long flags;
@@ -2196,6 +2196,7 @@ static void mxser_rs_break(struct tty_struct *tty, int break_state)
                 outb(inb(info->ioaddr + UART_LCR) & ~UART_LCR_SBC,
                         info->ioaddr + UART_LCR);
         spin_unlock_irqrestore(&info->slock, flags);
+        return 0;
 }
 
 static void mxser_receive_chars(struct mxser_port *port, int *status)
diff --git a/drivers/char/pcmcia/synclink_cs.c b/drivers/char/pcmcia/synclink_cs.c
index b694d430f10e..d1fceabe3aef 100644
--- a/drivers/char/pcmcia/synclink_cs.c
+++ b/drivers/char/pcmcia/synclink_cs.c
@@ -2230,7 +2230,7 @@ static int tiocmset(struct tty_struct *tty, struct file *file,
  * Arguments:           tty             pointer to tty instance data
  *                      break_state     -1=set break condition, 0=clear
  */
-static void mgslpc_break(struct tty_struct *tty, int break_state)
+static int mgslpc_break(struct tty_struct *tty, int break_state)
 {
         MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
         unsigned long flags;
@@ -2240,7 +2240,7 @@ static void mgslpc_break(struct tty_struct *tty, int break_state)
                          __FILE__,__LINE__, info->device_name, break_state);
 
         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_break"))
-                return;
+                return -EINVAL;
 
         spin_lock_irqsave(&info->lock,flags);
         if (break_state == -1)
@@ -2248,6 +2248,7 @@ static void mgslpc_break(struct tty_struct *tty, int break_state)
         else
                 clear_reg_bits(info, CHA+DAFO, BIT6);
         spin_unlock_irqrestore(&info->lock,flags);
+        return 0;
 }
 
 /* Service an IOCTL request
diff --git a/drivers/char/rocket.c b/drivers/char/rocket.c
index e670eae2f510..584d791e84a6 100644
--- a/drivers/char/rocket.c
+++ b/drivers/char/rocket.c
@@ -1236,13 +1236,13 @@ static void rp_set_termios(struct tty_struct *tty,
         }
 }
 
-static void rp_break(struct tty_struct *tty, int break_state)
+static int rp_break(struct tty_struct *tty, int break_state)
 {
         struct r_port *info = (struct r_port *) tty->driver_data;
         unsigned long flags;
 
         if (rocket_paranoia_check(info, "rp_break"))
-                return;
+                return -EINVAL;
 
         spin_lock_irqsave(&info->slock, flags);
         if (break_state == -1)
@@ -1250,6 +1250,7 @@ static void rp_break(struct tty_struct *tty, int break_state)
         else
                 sClrBreak(&info->channel);
         spin_unlock_irqrestore(&info->slock, flags);
+        return 0;
 }
 
 /*
diff --git a/drivers/char/sx.c b/drivers/char/sx.c
index d5cffcd6a572..2162439bbe48 100644
--- a/drivers/char/sx.c
+++ b/drivers/char/sx.c
@@ -1840,7 +1840,7 @@ static int sx_fw_ioctl(struct inode *inode, struct file *filp,
         return rc;
 }
 
-static void sx_break(struct tty_struct *tty, int flag)
+static int sx_break(struct tty_struct *tty, int flag)
 {
         struct sx_port *port = tty->driver_data;
         int rv;
@@ -1857,6 +1857,7 @@ static void sx_break(struct tty_struct *tty, int flag)
                         read_sx_byte(port->board, CHAN_OFFSET(port, hi_hstat)));
         unlock_kernel();
         func_exit();
+        return 0;
 }
 
 static int sx_tiocmget(struct tty_struct *tty, struct file *file)
diff --git a/drivers/char/synclink.c b/drivers/char/synclink.c
index 527d220aa4aa..ef6706f09061 100644
--- a/drivers/char/synclink.c
+++ b/drivers/char/synclink.c
@@ -2897,9 +2897,9 @@ static int tiocmset(struct tty_struct *tty, struct file *file,
  *
  * Arguments:           tty             pointer to tty instance data
  *                      break_state     -1=set break condition, 0=clear
- * Return Value:        None
+ * Return Value:        error code
  */
-static void mgsl_break(struct tty_struct *tty, int break_state)
+static int mgsl_break(struct tty_struct *tty, int break_state)
 {
         struct mgsl_struct * info = (struct mgsl_struct *)tty->driver_data;
         unsigned long flags;
@@ -2909,7 +2909,7 @@ static void mgsl_break(struct tty_struct *tty, int break_state)
                          __FILE__,__LINE__, info->device_name, break_state);
                          
         if (mgsl_paranoia_check(info, tty->name, "mgsl_break"))
-                return;
+                return -EINVAL;
 
         spin_lock_irqsave(&info->irq_spinlock,flags);
         if (break_state == -1)
@@ -2917,6 +2917,7 @@ static void mgsl_break(struct tty_struct *tty, int break_state)
         else 
                 usc_OutReg(info,IOCR,(u16)(usc_InReg(info,IOCR) & ~BIT7));
         spin_unlock_irqrestore(&info->irq_spinlock,flags);
+        return 0;
         
 }       /* end of mgsl_break() */
 
diff --git a/drivers/char/synclink_gt.c b/drivers/char/synclink_gt.c
index 2c3e43bb2cc9..cf87bb89a77d 100644
--- a/drivers/char/synclink_gt.c
+++ b/drivers/char/synclink_gt.c
@@ -165,7 +165,7 @@ static int  read_proc(char *page, char **start, off_t off, int count,int *eof, v
 static int  chars_in_buffer(struct tty_struct *tty);
 static void throttle(struct tty_struct * tty);
 static void unthrottle(struct tty_struct * tty);
-static void set_break(struct tty_struct *tty, int break_state);
+static int set_break(struct tty_struct *tty, int break_state);
 
 /*
  * generic HDLC support and callbacks
@@ -513,7 +513,7 @@ static int  wait_mgsl_event(struct slgt_info *info, int __user *mask_ptr);
 static int  tiocmget(struct tty_struct *tty, struct file *file);
 static int  tiocmset(struct tty_struct *tty, struct file *file,
                      unsigned int set, unsigned int clear);
-static void set_break(struct tty_struct *tty, int break_state);
+static int set_break(struct tty_struct *tty, int break_state);
 static int  get_interface(struct slgt_info *info, int __user *if_mode);
 static int  set_interface(struct slgt_info *info, int if_mode);
 static int  set_gpio(struct slgt_info *info, struct gpio_desc __user *gpio);
@@ -1452,14 +1452,14 @@ static void unthrottle(struct tty_struct * tty)
  * set or clear transmit break condition
  * break_state  -1=set break condition, 0=clear
  */
-static void set_break(struct tty_struct *tty, int break_state)
+static int set_break(struct tty_struct *tty, int break_state)
 {
         struct slgt_info *info = tty->driver_data;
         unsigned short value;
         unsigned long flags;
 
         if (sanity_check(info, tty->name, "set_break"))
-                return;
+                return -EINVAL;
         DBGINFO(("%s set_break(%d)\n", info->device_name, break_state));
 
         spin_lock_irqsave(&info->lock,flags);
@@ -1470,6 +1470,7 @@ static void set_break(struct tty_struct *tty, int break_state)
                 value &= ~BIT6;
         wr_reg16(info, TCR, value);
         spin_unlock_irqrestore(&info->lock,flags);
+        return 0;
 }
 
 #if SYNCLINK_GENERIC_HDLC
diff --git a/drivers/char/synclinkmp.c b/drivers/char/synclinkmp.c
index 5768c4136342..c0490cbd0db2 100644
--- a/drivers/char/synclinkmp.c
+++ b/drivers/char/synclinkmp.c
@@ -527,7 +527,7 @@ static int  read_proc(char *page, char **start, off_t off, int count,int *eof, v
 static int  chars_in_buffer(struct tty_struct *tty);
 static void throttle(struct tty_struct * tty);
 static void unthrottle(struct tty_struct * tty);
-static void set_break(struct tty_struct *tty, int break_state);
+static int set_break(struct tty_struct *tty, int break_state);
 
 #if SYNCLINK_GENERIC_HDLC
 #define dev_to_port(D) (dev_to_hdlc(D)->priv)
@@ -552,7 +552,7 @@ static int  wait_mgsl_event(SLMP_INFO *info, int __user *mask_ptr);
 static int  tiocmget(struct tty_struct *tty, struct file *file);
 static int  tiocmset(struct tty_struct *tty, struct file *file,
                      unsigned int set, unsigned int clear);
-static void set_break(struct tty_struct *tty, int break_state);
+static int  set_break(struct tty_struct *tty, int break_state);
 
 static void add_device(SLMP_INFO *info);
 static void device_init(int adapter_num, struct pci_dev *pdev);
@@ -1587,7 +1587,7 @@ static void unthrottle(struct tty_struct * tty)
 /* set or clear transmit break condition
  * break_state  -1=set break condition, 0=clear
  */
-static void set_break(struct tty_struct *tty, int break_state)
+static int set_break(struct tty_struct *tty, int break_state)
 {
         unsigned char RegValue;
         SLMP_INFO * info = (SLMP_INFO *)tty->driver_data;
@@ -1598,7 +1598,7 @@ static void set_break(struct tty_struct *tty, int break_state)
                          __FILE__,__LINE__, info->device_name, break_state);
 
         if (sanity_check(info, tty->name, "set_break"))
-                return;
+                return -EINVAL;
 
         spin_lock_irqsave(&info->lock,flags);
         RegValue = read_reg(info, CTL);
@@ -1608,6 +1608,7 @@ static void set_break(struct tty_struct *tty, int break_state)
                 RegValue &= ~BIT3;
         write_reg(info, CTL, RegValue);
         spin_unlock_irqrestore(&info->lock,flags);
+        return 0;
 }
 
 #if SYNCLINK_GENERIC_HDLC
diff --git a/drivers/char/tty_io.c b/drivers/char/tty_io.c
index d27a08b374d0..d94cd8410c53 100644
--- a/drivers/char/tty_io.c
+++ b/drivers/char/tty_io.c
@@ -2849,16 +2849,29 @@ static int tiocsetd(struct tty_struct *tty, int __user *p)
 
 static int send_break(struct tty_struct *tty, unsigned int duration)
 {
-        if (tty_write_lock(tty, 0) < 0)
-                return -EINTR;
-        tty->ops->break_ctl(tty, -1);
-        if (!signal_pending(current))
-                msleep_interruptible(duration);
-        tty->ops->break_ctl(tty, 0);
-        tty_write_unlock(tty);
-        if (signal_pending(current))
-                return -EINTR;
-        return 0;
+        int retval;
+
+        if (tty->ops->break_ctl == NULL)
+                return 0;
+
+        if (tty->driver->flags & TTY_DRIVER_HARDWARE_BREAK)
+                retval = tty->ops->break_ctl(tty, duration);
+        else {
+                /* Do the work ourselves */
+                if (tty_write_lock(tty, 0) < 0)
+                        return -EINTR;
+                retval = tty->ops->break_ctl(tty, -1);
+                if (retval)
+                        goto out;
+                if (!signal_pending(current))
+                        msleep_interruptible(duration);
+                retval = tty->ops->break_ctl(tty, 0);
+out:
+                tty_write_unlock(tty);
+                if (signal_pending(current))
+                        retval = -EINTR;
+        }
+        return retval;
 }
 
 /**
@@ -2949,36 +2962,6 @@ long tty_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
             tty->driver->subtype == PTY_TYPE_MASTER)
                 real_tty = tty->link;
 
-        /*
-         * Break handling by driver
-         */
-
-        retval = -EINVAL;
-
-        if (!tty->ops->break_ctl) {
-                switch (cmd) {
-                case TIOCSBRK:
-                case TIOCCBRK:
-                        if (tty->ops->ioctl)
-                                retval = tty->ops->ioctl(tty, file, cmd, arg);
-                        if (retval != -EINVAL && retval != -ENOIOCTLCMD)
-                                printk(KERN_WARNING "tty: driver %s needs updating to use break_ctl\n", tty->driver->name);
-                        return retval;
-
-                /* These two ioctl's always return success; even if */
-                /* the driver doesn't support them. */
-                case TCSBRK:
-                case TCSBRKP:
-                        if (!tty->ops->ioctl)
-                                return 0;
-                        retval = tty->ops->ioctl(tty, file, cmd, arg);
-                        if (retval != -EINVAL && retval != -ENOIOCTLCMD)
-                                printk(KERN_WARNING "tty: driver %s needs updating to use break_ctl\n", tty->driver->name);
-                        if (retval == -ENOIOCTLCMD)
-                                retval = 0;
-                        return retval;
-                }
-        }
 
         /*
          * Factor out some common prep work
@@ -3000,6 +2983,9 @@ long tty_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
                 break;
         }
 
+        /*
+         *      Now do the stuff.
+         */
         switch (cmd) {
         case TIOCSTI:
                 return tiocsti(tty, p);
@@ -3043,12 +3029,11 @@ long tty_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
          */
         case TIOCSBRK:  /* Turn break on, unconditionally */
                 if (tty->ops->break_ctl)
-                        tty->ops->break_ctl(tty, -1);
+                        return tty->ops->break_ctl(tty, -1);
                 return 0;
-
         case TIOCCBRK:  /* Turn break off, unconditionally */
                 if (tty->ops->break_ctl)
-                        tty->ops->break_ctl(tty, 0);
+                        return tty->ops->break_ctl(tty, 0);
                 return 0;
         case TCSBRK:   /* SVID version: non-zero arg --> no break */
                 /* non-zero arg means wait for all output data
diff --git a/drivers/char/vme_scc.c b/drivers/char/vme_scc.c
index f17ac043b551..69c5afe97f19 100644
--- a/drivers/char/vme_scc.c
+++ b/drivers/char/vme_scc.c
@@ -85,7 +85,7 @@ static irqreturn_t scc_rx_int(int irq, void *data);
 static irqreturn_t scc_stat_int(int irq, void *data);
 static irqreturn_t scc_spcond_int(int irq, void *data);
 static void scc_setsignals(struct scc_port *port, int dtr, int rts);
-static void scc_break_ctl(struct tty_struct *tty, int break_state);
+static int scc_break_ctl(struct tty_struct *tty, int break_state);
 
 static struct tty_driver *scc_driver;
 
@@ -942,7 +942,7 @@ static int scc_ioctl(struct tty_struct *tty, struct file *file,
 }
 
 
-static void scc_break_ctl(struct tty_struct *tty, int break_state)
+static int scc_break_ctl(struct tty_struct *tty, int break_state)
 {
         struct scc_port *port = (struct scc_port *)tty->driver_data;
         unsigned long   flags;
@@ -952,6 +952,7 @@ static void scc_break_ctl(struct tty_struct *tty, int break_state)
         SCCmod(TX_CTRL_REG, ~TCR_SEND_BREAK, 
                         break_state ? TCR_SEND_BREAK : 0);
         local_irq_restore(flags);
+        return 0;
 }
 
 
diff --git a/drivers/isdn/capi/capi.c b/drivers/isdn/capi/capi.c
index 8a35029caca0..19e005e81fef 100644
--- a/drivers/isdn/capi/capi.c
+++ b/drivers/isdn/capi/capi.c
@@ -1302,11 +1302,12 @@ static void capinc_tty_hangup(struct tty_struct *tty)
 #endif
 }
 
-static void capinc_tty_break_ctl(struct tty_struct *tty, int state)
+static int capinc_tty_break_ctl(struct tty_struct *tty, int state)
 {
 #ifdef _DEBUG_TTYFUNCS
         printk(KERN_DEBUG "capinc_tty_break_ctl(%d)\n", state);
 #endif
+        return 0;
 }
 
 static void capinc_tty_flush_buffer(struct tty_struct *tty)
diff --git a/drivers/serial/serial_core.c b/drivers/serial/serial_core.c
index 0bce1fe2c62a..f977c98cfa95 100644
--- a/drivers/serial/serial_core.c
+++ b/drivers/serial/serial_core.c
@@ -934,7 +934,7 @@ uart_tiocmset(struct tty_struct *tty, struct file *file,
         return ret;
 }
 
-static void uart_break_ctl(struct tty_struct *tty, int break_state)
+static int uart_break_ctl(struct tty_struct *tty, int break_state)
 {
         struct uart_state *state = tty->driver_data;
         struct uart_port *port = state->port;
@@ -945,6 +945,7 @@ static void uart_break_ctl(struct tty_struct *tty, int break_state)
                 port->ops->break_ctl(port, break_state);
 
         mutex_unlock(&state->mutex);
+        return 0;
 }
 
 static int uart_do_autoconfig(struct uart_state *state)
diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c
index 95ae6377d7e5..0725b1871f23 100644
--- a/drivers/usb/class/cdc-acm.c
+++ b/drivers/usb/class/cdc-acm.c
@@ -732,13 +732,16 @@ static void acm_tty_unthrottle(struct tty_struct *tty)
         tasklet_schedule(&acm->urb_task);
 }
 
-static void acm_tty_break_ctl(struct tty_struct *tty, int state)
+static int acm_tty_break_ctl(struct tty_struct *tty, int state)
 {
         struct acm *acm = tty->driver_data;
+        int retval;
         if (!ACM_READY(acm))
-                return;
-        if (acm_send_break(acm, state ? 0xffff : 0))
+                return -EINVAL;
+        retval = acm_send_break(acm, state ? 0xffff : 0);
+        if (retval < 0)
                 dbg("send break failed");
+        return retval;
 }
 
 static int acm_tty_tiocmget(struct tty_struct *tty, struct file *file)
diff --git a/drivers/usb/serial/usb-serial.c b/drivers/usb/serial/usb-serial.c
index 51917b0f079a..8c2d531eedea 100644
--- a/drivers/usb/serial/usb-serial.c
+++ b/drivers/usb/serial/usb-serial.c
@@ -395,7 +395,7 @@ static void serial_set_termios(struct tty_struct *tty, struct ktermios *old)
                 tty_termios_copy_hw(tty->termios, old);
 }
 
-static void serial_break(struct tty_struct *tty, int break_state)
+static int serial_break(struct tty_struct *tty, int break_state)
 {
         struct usb_serial_port *port = tty->driver_data;
 
@@ -409,6 +409,7 @@ static void serial_break(struct tty_struct *tty, int break_state)
                 port->serial->type->break_ctl(tty, break_state);
                 unlock_kernel();
         }
+        return 0;
 }
 
 static int serial_read_proc(char *page, char **start, off_t off, int count,
diff --git a/include/linux/tty_driver.h b/include/linux/tty_driver.h
index d2a003586761..e1065ac0d922 100644
--- a/include/linux/tty_driver.h
+++ b/include/linux/tty_driver.h
@@ -135,7 +135,7 @@
  *
  *      Optional:
  *
- * void (*break_ctl)(struct tty_stuct *tty, int state);
+ * int (*break_ctl)(struct tty_stuct *tty, int state);
  *
  *      This optional routine requests the tty driver to turn on or
  *      off BREAK status on the RS-232 port.  If state is -1,
@@ -146,6 +146,10 @@
  *      handle the following ioctls: TCSBRK, TCSBRKP, TIOCSBRK,
  *      TIOCCBRK.
  *
+ *      If the driver sets TTY_DRIVER_HARDWARE_BREAK then the interface
+ *      will also be called with actual times and the hardware is expected
+ *      to do the delay work itself. 0 and -1 are still used for on/off.
+ *
  *      Optional: Required for TCSBRK/BRKP/etc handling.
  *
  * void (*wait_until_sent)(struct tty_struct *tty, int timeout);
@@ -192,7 +196,7 @@ struct tty_operations {
         void (*stop)(struct tty_struct *tty);
         void (*start)(struct tty_struct *tty);
         void (*hangup)(struct tty_struct *tty);
-        void (*break_ctl)(struct tty_struct *tty, int state);
+        int (*break_ctl)(struct tty_struct *tty, int state);
         void (*flush_buffer)(struct tty_struct *tty);
         void (*set_ldisc)(struct tty_struct *tty);
         void (*wait_until_sent)(struct tty_struct *tty, int timeout);
@@ -285,12 +289,18 @@ extern struct tty_driver *tty_find_polling_driver(char *name, int *line);
  * TTY_DRIVER_DEVPTS_MEM -- don't use the standard arrays, instead
  *      use dynamic memory keyed through the devpts filesystem.  This
  *      is only applicable to the pty driver.
+ *
+ * TTY_DRIVER_HARDWARE_BREAK -- hardware handles break signals. Pass
+ *      the requested timeout to the caller instead of using a simple
+ *      on/off interface.
+ *
  */
 #define TTY_DRIVER_INSTALLED            0x0001
 #define TTY_DRIVER_RESET_TERMIOS        0x0002
 #define TTY_DRIVER_REAL_RAW             0x0004
 #define TTY_DRIVER_DYNAMIC_DEV          0x0008
 #define TTY_DRIVER_DEVPTS_MEM           0x0010
+#define TTY_DRIVER_HARDWARE_BREAK       0x0020
 
 /* tty driver types */
 #define TTY_DRIVER_TYPE_SYSTEM          0x0001