Char: mxser_new, fix TIOCMIWAIT

There was schedule() missing in the TIOCMIWAIT ioctl.  Solve it by moving
the code to the wait_event_interruptible.

Cc: Jan "Yenya" Kasprzak <kas@fi.muni.cz>
Signed-off-by: Jiri Slaby <jirislaby@gmail.com>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/drivers/char/mxser_new.c b/drivers/char/mxser_new.c
index 59e0aac19c2fc7cf5a34166b616fce4d9cc85868..f7603b6aeb87e3ec526d6550ce9ce2d1e42aa600 100644 (file)
--- a/drivers/char/mxser_new.c
+++ b/drivers/char/mxser_new.c
@@ -1758,43 +1758,23 @@ static int mxser_ioctl(struct tty_struct *tty, struct file *file,
                 *   (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
                 * Caller should use TIOCGICOUNT to see which one it was
                 */
-       case TIOCMIWAIT: {
-               DECLARE_WAITQUEUE(wait, current);
-               int ret;
+       case TIOCMIWAIT:
                spin_lock_irqsave(&info->slock, flags);
-               cprev = info->icount;   /* note the counters on entry */
+               cnow = info->icount;    /* note the counters on entry */
                spin_unlock_irqrestore(&info->slock, flags);
 
-               add_wait_queue(&info->delta_msr_wait, &wait);
-               while (1) {
+               wait_event_interruptible(info->delta_msr_wait, ({
+                       cprev = cnow;
                        spin_lock_irqsave(&info->slock, flags);
                        cnow = info->icount;    /* atomic copy */
                        spin_unlock_irqrestore(&info->slock, flags);
 
-                       set_current_state(TASK_INTERRUPTIBLE);
-                       if (((arg & TIOCM_RNG) &&
-                                       (cnow.rng != cprev.rng)) ||
-                                       ((arg & TIOCM_DSR) &&
-                                       (cnow.dsr != cprev.dsr)) ||
-                                       ((arg & TIOCM_CD) &&
-                                       (cnow.dcd != cprev.dcd)) ||
-                                       ((arg & TIOCM_CTS) &&
-                                       (cnow.cts != cprev.cts))) {
-                               ret = 0;
-                               break;
-                       }
-                       /* see if a signal did it */
-                       if (signal_pending(current)) {
-                               ret = -ERESTARTSYS;
-                               break;
-                       }
-                       cprev = cnow;
-               }
-               current->state = TASK_RUNNING;
-               remove_wait_queue(&info->delta_msr_wait, &wait);
+                       ((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
+                       ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
+                       ((arg & TIOCM_CD)  && (cnow.dcd != cprev.dcd)) ||
+                       ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts));
+               }));
                break;
-       }
-       /* NOTREACHED */
        /*
         * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
         * Return: write counters to the user passed counter struct