isdn_tty: Prepare for BKL push down

Three things here
- Remove softcar handler
- Correct termios change detection logic
- Wrap break/ioctl in lock_kernel ready to drop it in the caller

Signed-off-by: Alan Cox <alan@redhat.com>
Cc: Karsten Keil <kkeil@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 8 insertions, 18 deletions

diff --git a/drivers/isdn/i4l/isdn_tty.c b/drivers/isdn/i4l/isdn_tty.c
index 8af0df1d5b8c..a033f53209d5 100644
--- a/drivers/isdn/i4l/isdn_tty.c
+++ b/drivers/isdn/i4l/isdn_tty.c
@@ -1352,12 +1352,14 @@ isdn_tty_tiocmget(struct tty_struct *tty, struct file *file)
         if (tty->flags & (1 << TTY_IO_ERROR))
                 return -EIO;
 
+        lock_kernel();
 #ifdef ISDN_DEBUG_MODEM_IOCTL
         printk(KERN_DEBUG "ttyI%d ioctl TIOCMGET\n", info->line);
 #endif
 
         control = info->mcr;
         status = info->msr;
+        unlock_kernel();
         return ((control & UART_MCR_RTS) ? TIOCM_RTS : 0)
             | ((control & UART_MCR_DTR) ? TIOCM_DTR : 0)
             | ((status & UART_MSR_DCD) ? TIOCM_CAR : 0)
@@ -1381,6 +1383,7 @@ isdn_tty_tiocmset(struct tty_struct *tty, struct file *file,
         printk(KERN_DEBUG "ttyI%d ioctl TIOCMxxx: %x %x\n", info->line, set, clear);
 #endif
 
+        lock_kernel();
         if (set & TIOCM_RTS)
                 info->mcr |= UART_MCR_RTS;
         if (set & TIOCM_DTR) {
@@ -1402,6 +1405,7 @@ isdn_tty_tiocmset(struct tty_struct *tty, struct file *file,
                         isdn_tty_modem_hup(info, 1);
                 }
         }
+        unlock_kernel();
         return 0;
 }
 
@@ -1435,21 +1439,6 @@ isdn_tty_ioctl(struct tty_struct *tty, struct file *file,
                                 return retval;
                         tty_wait_until_sent(tty, 0);
                         return 0;
-                case TIOCGSOFTCAR:
-#ifdef ISDN_DEBUG_MODEM_IOCTL
-                        printk(KERN_DEBUG "ttyI%d ioctl TIOCGSOFTCAR\n", info->line);
-#endif
-                        return put_user(C_CLOCAL(tty) ? 1 : 0, (ulong __user *) arg);
-                case TIOCSSOFTCAR:
-#ifdef ISDN_DEBUG_MODEM_IOCTL
-                        printk(KERN_DEBUG "ttyI%d ioctl TIOCSSOFTCAR\n", info->line);
-#endif
-                        if (get_user(arg, (ulong __user *) arg))
-                                return -EFAULT;
-                        tty->termios->c_cflag =
-                            ((tty->termios->c_cflag & ~CLOCAL) |
-                             (arg ? CLOCAL : 0));
-                        return 0;
                 case TIOCSERGETLSR:     /* Get line status register */
 #ifdef ISDN_DEBUG_MODEM_IOCTL
                         printk(KERN_DEBUG "ttyI%d ioctl TIOCSERGETLSR\n", info->line);
@@ -1472,13 +1461,14 @@ isdn_tty_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
         if (!old_termios)
                 isdn_tty_change_speed(info);
         else {
-                if (tty->termios->c_cflag == old_termios->c_cflag)
+                if (tty->termios->c_cflag == old_termios->c_cflag &&
+                    tty->termios->c_ispeed == old_termios->c_ispeed &&
+                    tty->termios->c_ospeed == old_termios->c_ospeed)
                         return;
                 isdn_tty_change_speed(info);
                 if ((old_termios->c_cflag & CRTSCTS) &&
-                    !(tty->termios->c_cflag & CRTSCTS)) {
+                    !(tty->termios->c_cflag & CRTSCTS))
                         tty->hw_stopped = 0;
-                }
         }
 }