1 files changed, 269 insertions, 30 deletions

diff --git a/drivers/char/tty_ioctl.c b/drivers/char/tty_ioctl.c
index 4ad47d321bd4..dee47f40c6a3 100644
--- a/drivers/char/tty_ioctl.c
+++ b/drivers/char/tty_ioctl.c
@@ -20,6 +20,7 @@
 #include <linux/mm.h>
 #include <linux/module.h>
 #include <linux/bitops.h>
+#include <linux/mutex.h>
 
 #include <asm/io.h>
 #include <asm/uaccess.h>
@@ -35,6 +36,7 @@
 #define TERMIOS_FLUSH   1
 #define TERMIOS_WAIT    2
 #define TERMIOS_TERMIO  4
+#define TERMIOS_OLD     8
 
 
 /**
@@ -83,9 +85,9 @@ stop_waiting:
 
 EXPORT_SYMBOL(tty_wait_until_sent);
 
-static void unset_locked_termios(struct termios *termios,
-                                 struct termios *old,
-                                 struct termios *locked)
+static void unset_locked_termios(struct ktermios *termios,
+                                 struct ktermios *old,
+                                 struct ktermios *locked)
 {
         int     i;
         
@@ -104,8 +106,204 @@ static void unset_locked_termios(struct termios *termios,
         for (i=0; i < NCCS; i++)
                 termios->c_cc[i] = locked->c_cc[i] ?
                         old->c_cc[i] : termios->c_cc[i];
+        /* FIXME: What should we do for i/ospeed */
 }
 
+/*
+ * Routine which returns the baud rate of the tty
+ *
+ * Note that the baud_table needs to be kept in sync with the
+ * include/asm/termbits.h file.
+ */
+static const speed_t baud_table[] = {
+        0, 50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2400, 4800,
+        9600, 19200, 38400, 57600, 115200, 230400, 460800,
+#ifdef __sparc__
+        76800, 153600, 307200, 614400, 921600
+#else
+        500000, 576000, 921600, 1000000, 1152000, 1500000, 2000000,
+        2500000, 3000000, 3500000, 4000000
+#endif
+};
+
+#ifndef __sparc__
+static const tcflag_t baud_bits[] = {
+        B0, B50, B75, B110, B134, B150, B200, B300, B600,
+        B1200, B1800, B2400, B4800, B9600, B19200, B38400,
+        B57600, B115200, B230400, B460800, B500000, B576000,
+        B921600, B1000000, B1152000, B1500000, B2000000, B2500000,
+        B3000000, B3500000, B4000000
+};
+#else
+static const tcflag_t baud_bits[] = {
+        B0, B50, B75, B110, B134, B150, B200, B300, B600,
+        B1200, B1800, B2400, B4800, B9600, B19200, B38400,
+        B57600, B115200, B230400, B460800, B76800, B153600,
+        B307200, B614400, B921600
+};
+#endif
+
+static int n_baud_table = ARRAY_SIZE(baud_table);
+
+/**
+ *      tty_termios_baud_rate
+ *      @termios: termios structure
+ *
+ *      Convert termios baud rate data into a speed. This should be called
+ *      with the termios lock held if this termios is a terminal termios
+ *      structure. May change the termios data. Device drivers can call this
+ *      function but should use ->c_[io]speed directly as they are updated.
+ *
+ *      Locking: none
+ */
+
+speed_t tty_termios_baud_rate(struct ktermios *termios)
+{
+        unsigned int cbaud;
+
+        cbaud = termios->c_cflag & CBAUD;
+
+#ifdef BOTHER
+        /* Magic token for arbitary speed via c_ispeed/c_ospeed */
+        if (cbaud == BOTHER)
+                return termios->c_ospeed;
+#endif
+        if (cbaud & CBAUDEX) {
+                cbaud &= ~CBAUDEX;
+
+                if (cbaud < 1 || cbaud + 15 > n_baud_table)
+                        termios->c_cflag &= ~CBAUDEX;
+                else
+                        cbaud += 15;
+        }
+        return baud_table[cbaud];
+}
+
+EXPORT_SYMBOL(tty_termios_baud_rate);
+
+/**
+ *      tty_termios_input_baud_rate
+ *      @termios: termios structure
+ *
+ *      Convert termios baud rate data into a speed. This should be called
+ *      with the termios lock held if this termios is a terminal termios
+ *      structure. May change the termios data. Device drivers can call this
+ *      function but should use ->c_[io]speed directly as they are updated.
+ *
+ *      Locking: none
+ */
+
+speed_t tty_termios_input_baud_rate(struct ktermios *termios)
+{
+#ifdef IBSHIFT
+        unsigned int cbaud = (termios->c_cflag >> IBSHIFT) & CBAUD;
+
+        if (cbaud == B0)
+                return tty_termios_baud_rate(termios);
+
+        /* Magic token for arbitary speed via c_ispeed*/
+        if (cbaud == BOTHER)
+                return termios->c_ispeed;
+
+        if (cbaud & CBAUDEX) {
+                cbaud &= ~CBAUDEX;
+
+                if (cbaud < 1 || cbaud + 15 > n_baud_table)
+                        termios->c_cflag &= ~(CBAUDEX << IBSHIFT);
+                else
+                        cbaud += 15;
+        }
+        return baud_table[cbaud];
+#else
+        return tty_termios_baud_rate(termios);
+#endif
+}
+
+EXPORT_SYMBOL(tty_termios_input_baud_rate);
+
+#ifdef BOTHER
+
+/**
+ *      tty_termios_encode_baud_rate
+ *      @termios: termios structure
+ *      @ispeed: input speed
+ *      @ospeed: output speed
+ *
+ *      Encode the speeds set into the passed termios structure. This is
+ *      used as a library helper for drivers os that they can report back
+ *      the actual speed selected when it differs from the speed requested
+ *
+ *      For now input and output speed must agree.
+ *
+ *      Locking: Caller should hold termios lock. This is already held
+ *      when calling this function from the driver termios handler.
+ */
+
+void tty_termios_encode_baud_rate(struct ktermios *termios, speed_t ibaud, speed_t obaud)
+{
+        int i = 0;
+        int ifound = 0, ofound = 0;
+
+        termios->c_ispeed = ibaud;
+        termios->c_ospeed = obaud;
+
+        termios->c_cflag &= ~CBAUD;
+        /* Identical speed means no input encoding (ie B0 << IBSHIFT)*/
+        if (termios->c_ispeed == termios->c_ospeed)
+                ifound = 1;
+
+        do {
+                if (obaud == baud_table[i]) {
+                        termios->c_cflag |= baud_bits[i];
+                        ofound = 1;
+                        /* So that if ibaud == obaud we don't set it */
+                        continue;
+                }
+                if (ibaud == baud_table[i]) {
+                        termios->c_cflag |= (baud_bits[i] << IBSHIFT);
+                        ifound = 1;
+                }
+        }
+        while(++i < n_baud_table);
+        if (!ofound)
+                termios->c_cflag |= BOTHER;
+        if (!ifound)
+                termios->c_cflag |= (BOTHER << IBSHIFT);
+}
+
+EXPORT_SYMBOL_GPL(tty_termios_encode_baud_rate);
+
+#endif
+
+/**
+ *      tty_get_baud_rate       -       get tty bit rates
+ *      @tty: tty to query
+ *
+ *      Returns the baud rate as an integer for this terminal. The
+ *      termios lock must be held by the caller and the terminal bit
+ *      flags may be updated.
+ *
+ *      Locking: none
+ */
+
+speed_t tty_get_baud_rate(struct tty_struct *tty)
+{
+        speed_t baud = tty_termios_baud_rate(tty->termios);
+
+        if (baud == 38400 && tty->alt_speed) {
+                if (!tty->warned) {
+                        printk(KERN_WARNING "Use of setserial/setrocket to "
+                                            "set SPD_* flags is deprecated\n");
+                        tty->warned = 1;
+                }
+                baud = tty->alt_speed;
+        }
+
+        return baud;
+}
+
+EXPORT_SYMBOL(tty_get_baud_rate);
+
 /**
  *      change_termios          -       update termios values
  *      @tty: tty to update
@@ -118,10 +316,10 @@ static void unset_locked_termios(struct termios *termios,
  *      Locking: termios_sem
  */
 
-static void change_termios(struct tty_struct * tty, struct termios * new_termios)
+static void change_termios(struct tty_struct * tty, struct ktermios * new_termios)
 {
         int canon_change;
-        struct termios old_termios = *tty->termios;
+        struct ktermios old_termios = *tty->termios;
         struct tty_ldisc *ld;
         
         /*
@@ -131,7 +329,7 @@ static void change_termios(struct tty_struct * tty, struct termios * new_termios
 
         /* FIXME: we need to decide on some locking/ordering semantics
            for the set_termios notification eventually */
-        down(&tty->termios_sem);
+        mutex_lock(&tty->termios_mutex);
 
         *tty->termios = *new_termios;
         unset_locked_termios(tty->termios, &old_termios, tty->termios_locked);
@@ -176,7 +374,7 @@ static void change_termios(struct tty_struct * tty, struct termios * new_termios
                         (ld->set_termios)(tty, &old_termios);
                 tty_ldisc_deref(ld);
         }
-        up(&tty->termios_sem);
+        mutex_unlock(&tty->termios_mutex);
 }
 
 /**
@@ -194,23 +392,39 @@ static void change_termios(struct tty_struct * tty, struct termios * new_termios
 
 static int set_termios(struct tty_struct * tty, void __user *arg, int opt)
 {
-        struct termios tmp_termios;
+        struct ktermios tmp_termios;
         struct tty_ldisc *ld;
         int retval = tty_check_change(tty);
 
         if (retval)
                 return retval;
 
+        memcpy(&tmp_termios, tty->termios, sizeof(struct ktermios));
+
         if (opt & TERMIOS_TERMIO) {
-                memcpy(&tmp_termios, tty->termios, sizeof(struct termios));
                 if (user_termio_to_kernel_termios(&tmp_termios,
                                                 (struct termio __user *)arg))
                         return -EFAULT;
+#ifdef TCGETS2
+        } else if (opt & TERMIOS_OLD) {
+                if (user_termios_to_kernel_termios_1(&tmp_termios,
+                                                (struct termios __user *)arg))
+                        return -EFAULT;
         } else {
                 if (user_termios_to_kernel_termios(&tmp_termios,
-                                                (struct termios __user *)arg))
+                                                (struct termios2 __user *)arg))
                         return -EFAULT;
         }
+#else
+        } else if (user_termios_to_kernel_termios(&tmp_termios,
+                                        (struct termios __user *)arg))
+                return -EFAULT;
+#endif
+
+        /* If old style Bfoo values are used then load c_ispeed/c_ospeed with the real speed
+           so its unconditionally usable */
+        tmp_termios.c_ispeed = tty_termios_input_baud_rate(&tmp_termios);
+        tmp_termios.c_ospeed = tty_termios_baud_rate(&tmp_termios);
 
         ld = tty_ldisc_ref(tty);
         
@@ -284,18 +498,18 @@ static int get_sgttyb(struct tty_struct * tty, struct sgttyb __user * sgttyb)
 {
         struct sgttyb tmp;
 
-        down(&tty->termios_sem);
-        tmp.sg_ispeed = 0;
-        tmp.sg_ospeed = 0;
+        mutex_lock(&tty->termios_mutex);
+        tmp.sg_ispeed = tty->termios->c_ispeed;
+        tmp.sg_ospeed = tty->termios->c_ospeed;
         tmp.sg_erase = tty->termios->c_cc[VERASE];
         tmp.sg_kill = tty->termios->c_cc[VKILL];
         tmp.sg_flags = get_sgflags(tty);
-        up(&tty->termios_sem);
+        mutex_unlock(&tty->termios_mutex);
         
         return copy_to_user(sgttyb, &tmp, sizeof(tmp)) ? -EFAULT : 0;
 }
 
-static void set_sgflags(struct termios * termios, int flags)
+static void set_sgflags(struct ktermios * termios, int flags)
 {
         termios->c_iflag = ICRNL | IXON;
         termios->c_oflag = 0;
@@ -336,7 +550,7 @@ static int set_sgttyb(struct tty_struct * tty, struct sgttyb __user * sgttyb)
 {
         int retval;
         struct sgttyb tmp;
-        struct termios termios;
+        struct ktermios termios;
 
         retval = tty_check_change(tty);
         if (retval)
@@ -345,12 +559,16 @@ static int set_sgttyb(struct tty_struct * tty, struct sgttyb __user * sgttyb)
         if (copy_from_user(&tmp, sgttyb, sizeof(tmp)))
                 return -EFAULT;
 
-        down(&tty->termios_sem);                
+        mutex_lock(&tty->termios_mutex);
         termios =  *tty->termios;
         termios.c_cc[VERASE] = tmp.sg_erase;
         termios.c_cc[VKILL] = tmp.sg_kill;
         set_sgflags(&termios, tmp.sg_flags);
-        up(&tty->termios_sem);
+        /* Try and encode into Bfoo format */
+#ifdef BOTHER
+        tty_termios_encode_baud_rate(&termios, termios.c_ispeed, termios.c_ospeed);
+#endif
+        mutex_unlock(&tty->termios_mutex);
         change_termios(tty, &termios);
         return 0;
 }
@@ -422,24 +640,28 @@ static int set_ltchars(struct tty_struct * tty, struct ltchars __user * ltchars)
  *
  *      Send a high priority character to the tty even if stopped
  *
- *      Locking: none
- *
- *      FIXME: overlapping calls with start/stop tty lose state of tty
+ *      Locking: none for xchar method, write ordering for write method.
  */
 
-static void send_prio_char(struct tty_struct *tty, char ch)
+static int send_prio_char(struct tty_struct *tty, char ch)
 {
         int     was_stopped = tty->stopped;
 
         if (tty->driver->send_xchar) {
                 tty->driver->send_xchar(tty, ch);
-                return;
+                return 0;
         }
+
+        if (mutex_lock_interruptible(&tty->atomic_write_lock))
+                return -ERESTARTSYS;
+
         if (was_stopped)
                 start_tty(tty);
         tty->driver->write(tty, &ch, 1);
         if (was_stopped)
                 stop_tty(tty);
+        mutex_unlock(&tty->atomic_write_lock);
+        return 0;
 }
 
 int n_tty_ioctl(struct tty_struct * tty, struct file * file,
@@ -476,16 +698,33 @@ int n_tty_ioctl(struct tty_struct * tty, struct file * file,
                 case TIOCSLTC:
                         return set_ltchars(real_tty, p);
 #endif
+                case TCSETSF:
+                        return set_termios(real_tty, p,  TERMIOS_FLUSH | TERMIOS_WAIT | TERMIOS_OLD);
+                case TCSETSW:
+                        return set_termios(real_tty, p, TERMIOS_WAIT | TERMIOS_OLD);
+                case TCSETS:
+                        return set_termios(real_tty, p, TERMIOS_OLD);
+#ifndef TCGETS2
                 case TCGETS:
                         if (kernel_termios_to_user_termios((struct termios __user *)arg, real_tty->termios))
                                 return -EFAULT;
                         return 0;
-                case TCSETSF:
+#else
+                case TCGETS:
+                        if (kernel_termios_to_user_termios_1((struct termios __user *)arg, real_tty->termios))
+                                return -EFAULT;
+                        return 0;
+                case TCGETS2:
+                        if (kernel_termios_to_user_termios((struct termios2 __user *)arg, real_tty->termios))
+                                return -EFAULT;
+                        return 0;
+                case TCSETSF2:
                         return set_termios(real_tty, p,  TERMIOS_FLUSH | TERMIOS_WAIT);
-                case TCSETSW:
+                case TCSETSW2:
                         return set_termios(real_tty, p, TERMIOS_WAIT);
-                case TCSETS:
+                case TCSETS2:
                         return set_termios(real_tty, p, 0);
+#endif
                 case TCGETA:
                         return get_termio(real_tty, p);
                 case TCSETAF:
@@ -513,11 +752,11 @@ int n_tty_ioctl(struct tty_struct * tty, struct file * file,
                                 break;
                         case TCIOFF:
                                 if (STOP_CHAR(tty) != __DISABLED_CHAR)
-                                        send_prio_char(tty, STOP_CHAR(tty));
+                                        return send_prio_char(tty, STOP_CHAR(tty));
                                 break;
                         case TCION:
                                 if (START_CHAR(tty) != __DISABLED_CHAR)
-                                        send_prio_char(tty, START_CHAR(tty));
+                                        return send_prio_char(tty, START_CHAR(tty));
                                 break;
                         default:
                                 return -EINVAL;
@@ -592,11 +831,11 @@ int n_tty_ioctl(struct tty_struct * tty, struct file * file,
                 case TIOCSSOFTCAR:
                         if (get_user(arg, (unsigned int __user *) arg))
                                 return -EFAULT;
-                        down(&tty->termios_sem);
+                        mutex_lock(&tty->termios_mutex);
                         tty->termios->c_cflag =
                                 ((tty->termios->c_cflag & ~CLOCAL) |
                                  (arg ? CLOCAL : 0));
-                        up(&tty->termios_sem);
+                        mutex_unlock(&tty->termios_mutex);
                         return 0;
                 default:
                         return -ENOIOCTLCMD;