epca: lock_kernel push down

Prepare epca for removing the lock from above. Most of epca is internally
locked so we can trivially push it down to a few bits of code. Drop the TIOCG/SSOFTCAR handling as that is done *properly* with locks by the mid layer.

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

diff --git a/drivers/char/epca.c b/drivers/char/epca.c
index ffd747c..9a68285 100644 (file)
--- a/drivers/char/epca.c
+++ b/drivers/char/epca.c
@@ -2206,21 +2206,6 @@ static int pc_ioctl(struct tty_struct *tty, struct file * file,
                tty_wait_until_sent(tty, 0);
                digi_send_break(ch, arg ? arg*(HZ/10) : HZ/4);
                return 0;
-       case TIOCGSOFTCAR:
-               if (put_user(C_CLOCAL(tty)?1:0, (unsigned long __user *)arg))
-                       return -EFAULT;
-               return 0;
-       case TIOCSSOFTCAR:
-               {
-                       unsigned int value;
-
-                       if (get_user(value, (unsigned __user *)argp))
-                               return -EFAULT;
-                       tty->termios->c_cflag =
-                               ((tty->termios->c_cflag & ~CLOCAL) |
-                                (value ? CLOCAL : 0));
-                       return 0;
-               }
        case TIOCMODG:
                mflag = pc_tiocmget(tty, file);
                if (put_user(mflag, (unsigned long __user *)argp))
@@ -2253,6 +2238,7 @@ static int pc_ioctl(struct tty_struct *tty, struct file * file,
                break;
        case DIGI_SETAW:
        case DIGI_SETAF:
+               lock_kernel();
                if (cmd == DIGI_SETAW) {
                        /* Setup an event to indicate when the transmit buffer empties */
                        spin_lock_irqsave(&epca_lock, flags);
@@ -2264,6 +2250,7 @@ static int pc_ioctl(struct tty_struct *tty, struct file * file,
                        if (tty->ldisc.flush_buffer)
                                tty->ldisc.flush_buffer(tty);
                }
+               unlock_kernel();
                /* Fall Thru */
        case DIGI_SETA:
                if (copy_from_user(&ch->digiext, argp, sizeof(digi_t)))