header cleaning: don't include smp_lock.h when not used

[linux.git] / drivers / char / mxser_new.c

diff --git a/drivers/char/mxser_new.c b/drivers/char/mxser_new.c
index 9af07e4999d5f0cac406a3f2200adad82b27dcca..6cde448cd5b2177479e46ccd634e1a8335fb720a 100644 (file)
--- a/drivers/char/mxser_new.c
+++ b/drivers/char/mxser_new.c
@@ -37,7 +37,6 @@
 #include <linux/gfp.h>
 #include <linux/ioport.h>
 #include <linux/mm.h>
-#include <linux/smp_lock.h>
 #include <linux/delay.h>
 #include <linux/pci.h>
 
@@ -1758,43 +1757,23 @@ 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
@@ -2230,7 +2209,14 @@ end_intr:
        port->mon_data.rxcnt += cnt;
        port->mon_data.up_rxcnt += cnt;
 
+       /*
+        * We are called from an interrupt context with &port->slock
+        * being held. Drop it temporarily in order to prevent
+        * recursive locking.
+        */
+       spin_unlock(&port->slock);
        tty_flip_buffer_push(tty);
+       spin_lock(&port->slock);
 }
 
 static void mxser_transmit_chars(struct mxser_port *port)