1 files changed, 136 insertions, 136 deletions

diff --git a/drivers/char/stallion.c b/drivers/char/stallion.c
index 604a2448632d..6a6e5124a5fa 100644
--- a/drivers/char/stallion.c
+++ b/drivers/char/stallion.c
@@ -187,32 +187,32 @@ static stlbrd_t		*stl_brds[STL_MAXBRDS];
  *      referencing boards when printing trace and stuff.
  */
 static char     *stl_brdnames[] = {
-        (char *) NULL,
-        (char *) NULL,
-        (char *) NULL,
-        (char *) NULL,
-        (char *) NULL,
-        (char *) NULL,
-        (char *) NULL,
-        (char *) NULL,
-        (char *) NULL,
-        (char *) NULL,
-        (char *) NULL,
-        (char *) NULL,
-        (char *) NULL,
-        (char *) NULL,
-        (char *) NULL,
-        (char *) NULL,
-        (char *) NULL,
-        (char *) NULL,
-        (char *) NULL,
-        (char *) NULL,
+        NULL,
+        NULL,
+        NULL,
+        NULL,
+        NULL,
+        NULL,
+        NULL,
+        NULL,
+        NULL,
+        NULL,
+        NULL,
+        NULL,
+        NULL,
+        NULL,
+        NULL,
+        NULL,
+        NULL,
+        NULL,
+        NULL,
+        NULL,
         "EasyIO",
         "EC8/32-AT",
         "EC8/32-MC",
-        (char *) NULL,
-        (char *) NULL,
-        (char *) NULL,
+        NULL,
+        NULL,
+        NULL,
         "EC8/32-PCI",
         "EC8/64-PCI",
         "EasyIO-PCI",
@@ -761,20 +761,20 @@ static void __exit stallion_module_exit(void)
         class_destroy(stallion_class);
 
         for (i = 0; (i < stl_nrbrds); i++) {
-                if ((brdp = stl_brds[i]) == (stlbrd_t *) NULL)
+                if ((brdp = stl_brds[i]) == NULL)
                         continue;
 
                 free_irq(brdp->irq, brdp);
 
                 for (j = 0; (j < STL_MAXPANELS); j++) {
                         panelp = brdp->panels[j];
-                        if (panelp == (stlpanel_t *) NULL)
+                        if (panelp == NULL)
                                 continue;
                         for (k = 0; (k < STL_PORTSPERPANEL); k++) {
                                 portp = panelp->ports[k];
-                                if (portp == (stlport_t *) NULL)
+                                if (portp == NULL)
                                         continue;
-                                if (portp->tty != (struct tty_struct *) NULL)
+                                if (portp->tty != NULL)
                                         stl_hangup(portp->tty);
                                 kfree(portp->tx.buf);
                                 kfree(portp);
@@ -787,7 +787,7 @@ static void __exit stallion_module_exit(void)
                         release_region(brdp->ioaddr2, brdp->iosize2);
 
                 kfree(brdp);
-                stl_brds[i] = (stlbrd_t *) NULL;
+                stl_brds[i] = NULL;
         }
 }
 
@@ -812,7 +812,7 @@ static void stl_argbrds(void)
                 memset(&conf, 0, sizeof(conf));
                 if (stl_parsebrd(&conf, stl_brdsp[i]) == 0)
                         continue;
-                if ((brdp = stl_allocbrd()) == (stlbrd_t *) NULL)
+                if ((brdp = stl_allocbrd()) == NULL)
                         continue;
                 stl_nrbrds = i + 1;
                 brdp->brdnr = i;
@@ -874,7 +874,7 @@ static int stl_parsebrd(stlconf_t *confp, char **argp)
 
         pr_debug("stl_parsebrd(confp=%p,argp=%p)\n", confp, argp);
 
-        if ((argp[0] == (char *) NULL) || (*argp[0] == 0))
+        if ((argp[0] == NULL) || (*argp[0] == 0))
                 return 0;
 
         for (sp = argp[0], i = 0; ((*sp != 0) && (i < 25)); sp++, i++)
@@ -892,15 +892,15 @@ static int stl_parsebrd(stlconf_t *confp, char **argp)
         confp->brdtype = stl_brdstr[i].type;
 
         i = 1;
-        if ((argp[i] != (char *) NULL) && (*argp[i] != 0))
+        if ((argp[i] != NULL) && (*argp[i] != 0))
                 confp->ioaddr1 = stl_atol(argp[i]);
         i++;
         if (confp->brdtype == BRD_ECH) {
-                if ((argp[i] != (char *) NULL) && (*argp[i] != 0))
+                if ((argp[i] != NULL) && (*argp[i] != 0))
                         confp->ioaddr2 = stl_atol(argp[i]);
                 i++;
         }
-        if ((argp[i] != (char *) NULL) && (*argp[i] != 0))
+        if ((argp[i] != NULL) && (*argp[i] != 0))
                 confp->irq = stl_atol(argp[i]);
         return 1;
 }
@@ -942,11 +942,11 @@ static int stl_open(struct tty_struct *tty, struct file *filp)
         if (brdnr >= stl_nrbrds)
                 return -ENODEV;
         brdp = stl_brds[brdnr];
-        if (brdp == (stlbrd_t *) NULL)
+        if (brdp == NULL)
                 return -ENODEV;
         minordev = MINOR2PORT(minordev);
         for (portnr = -1, panelnr = 0; (panelnr < STL_MAXPANELS); panelnr++) {
-                if (brdp->panels[panelnr] == (stlpanel_t *) NULL)
+                if (brdp->panels[panelnr] == NULL)
                         break;
                 if (minordev < brdp->panels[panelnr]->nrports) {
                         portnr = minordev;
@@ -958,7 +958,7 @@ static int stl_open(struct tty_struct *tty, struct file *filp)
                 return -ENODEV;
 
         portp = brdp->panels[panelnr]->ports[portnr];
-        if (portp == (stlport_t *) NULL)
+        if (portp == NULL)
                 return -ENODEV;
 
 /*
@@ -1080,7 +1080,7 @@ static void stl_close(struct tty_struct *tty, struct file *filp)
         pr_debug("stl_close(tty=%p,filp=%p)\n", tty, filp);
 
         portp = tty->driver_data;
-        if (portp == (stlport_t *) NULL)
+        if (portp == NULL)
                 return;
 
         spin_lock_irqsave(&stallion_lock, flags);
@@ -1123,17 +1123,17 @@ static void stl_close(struct tty_struct *tty, struct file *filp)
         stl_enablerxtx(portp, 0, 0);
         stl_flushbuffer(tty);
         portp->istate = 0;
-        if (portp->tx.buf != (char *) NULL) {
+        if (portp->tx.buf != NULL) {
                 kfree(portp->tx.buf);
-                portp->tx.buf = (char *) NULL;
-                portp->tx.head = (char *) NULL;
-                portp->tx.tail = (char *) NULL;
+                portp->tx.buf = NULL;
+                portp->tx.head = NULL;
+                portp->tx.tail = NULL;
         }
         set_bit(TTY_IO_ERROR, &tty->flags);
         tty_ldisc_flush(tty);
 
         tty->closing = 0;
-        portp->tty = (struct tty_struct *) NULL;
+        portp->tty = NULL;
 
         if (portp->openwaitcnt) {
                 if (portp->close_delay)
@@ -1162,9 +1162,9 @@ static int stl_write(struct tty_struct *tty, const unsigned char *buf, int count
         pr_debug("stl_write(tty=%p,buf=%p,count=%d)\n", tty, buf, count);
 
         portp = tty->driver_data;
-        if (portp == (stlport_t *) NULL)
+        if (portp == NULL)
                 return 0;
-        if (portp->tx.buf == (char *) NULL)
+        if (portp->tx.buf == NULL)
                 return 0;
 
 /*
@@ -1217,12 +1217,12 @@ static void stl_putchar(struct tty_struct *tty, unsigned char ch)
 
         pr_debug("stl_putchar(tty=%p,ch=%x)\n", tty, ch);
 
-        if (tty == (struct tty_struct *) NULL)
+        if (tty == NULL)
                 return;
         portp = tty->driver_data;
-        if (portp == (stlport_t *) NULL)
+        if (portp == NULL)
                 return;
-        if (portp->tx.buf == (char *) NULL)
+        if (portp->tx.buf == NULL)
                 return;
 
         head = portp->tx.head;
@@ -1253,12 +1253,12 @@ static void stl_flushchars(struct tty_struct *tty)
 
         pr_debug("stl_flushchars(tty=%p)\n", tty);
 
-        if (tty == (struct tty_struct *) NULL)
+        if (tty == NULL)
                 return;
         portp = tty->driver_data;
-        if (portp == (stlport_t *) NULL)
+        if (portp == NULL)
                 return;
-        if (portp->tx.buf == (char *) NULL)
+        if (portp->tx.buf == NULL)
                 return;
 
         stl_startrxtx(portp, -1, 1);
@@ -1273,12 +1273,12 @@ static int stl_writeroom(struct tty_struct *tty)
 
         pr_debug("stl_writeroom(tty=%p)\n", tty);
 
-        if (tty == (struct tty_struct *) NULL)
+        if (tty == NULL)
                 return 0;
         portp = tty->driver_data;
-        if (portp == (stlport_t *) NULL)
+        if (portp == NULL)
                 return 0;
-        if (portp->tx.buf == (char *) NULL)
+        if (portp->tx.buf == NULL)
                 return 0;
 
         head = portp->tx.head;
@@ -1305,12 +1305,12 @@ static int stl_charsinbuffer(struct tty_struct *tty)
 
         pr_debug("stl_charsinbuffer(tty=%p)\n", tty);
 
-        if (tty == (struct tty_struct *) NULL)
+        if (tty == NULL)
                 return 0;
         portp = tty->driver_data;
-        if (portp == (stlport_t *) NULL)
+        if (portp == NULL)
                 return 0;
-        if (portp->tx.buf == (char *) NULL)
+        if (portp->tx.buf == NULL)
                 return 0;
 
         head = portp->tx.head;
@@ -1352,7 +1352,7 @@ static int stl_getserial(stlport_t *portp, struct serial_struct __user *sp)
         }
 
         brdp = stl_brds[portp->brdnr];
-        if (brdp != (stlbrd_t *) NULL)
+        if (brdp != NULL)
                 sio.irq = brdp->irq;
 
         return copy_to_user(sp, &sio, sizeof(struct serial_struct)) ? -EFAULT : 0;
@@ -1398,10 +1398,10 @@ static int stl_tiocmget(struct tty_struct *tty, struct file *file)
 {
         stlport_t       *portp;
 
-        if (tty == (struct tty_struct *) NULL)
+        if (tty == NULL)
                 return -ENODEV;
         portp = tty->driver_data;
-        if (portp == (stlport_t *) NULL)
+        if (portp == NULL)
                 return -ENODEV;
         if (tty->flags & (1 << TTY_IO_ERROR))
                 return -EIO;
@@ -1415,10 +1415,10 @@ static int stl_tiocmset(struct tty_struct *tty, struct file *file,
         stlport_t       *portp;
         int rts = -1, dtr = -1;
 
-        if (tty == (struct tty_struct *) NULL)
+        if (tty == NULL)
                 return -ENODEV;
         portp = tty->driver_data;
-        if (portp == (stlport_t *) NULL)
+        if (portp == NULL)
                 return -ENODEV;
         if (tty->flags & (1 << TTY_IO_ERROR))
                 return -EIO;
@@ -1446,10 +1446,10 @@ static int stl_ioctl(struct tty_struct *tty, struct file *file, unsigned int cmd
         pr_debug("stl_ioctl(tty=%p,file=%p,cmd=%x,arg=%lx)\n", tty, file, cmd,
                         arg);
 
-        if (tty == (struct tty_struct *) NULL)
+        if (tty == NULL)
                 return -ENODEV;
         portp = tty->driver_data;
-        if (portp == (stlport_t *) NULL)
+        if (portp == NULL)
                 return -ENODEV;
 
         if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
@@ -1508,10 +1508,10 @@ static void stl_settermios(struct tty_struct *tty, struct termios *old)
 
         pr_debug("stl_settermios(tty=%p,old=%p)\n", tty, old);
 
-        if (tty == (struct tty_struct *) NULL)
+        if (tty == NULL)
                 return;
         portp = tty->driver_data;
-        if (portp == (stlport_t *) NULL)
+        if (portp == NULL)
                 return;
 
         tiosp = tty->termios;
@@ -1543,10 +1543,10 @@ static void stl_throttle(struct tty_struct *tty)
 
         pr_debug("stl_throttle(tty=%p)\n", tty);
 
-        if (tty == (struct tty_struct *) NULL)
+        if (tty == NULL)
                 return;
         portp = tty->driver_data;
-        if (portp == (stlport_t *) NULL)
+        if (portp == NULL)
                 return;
         stl_flowctrl(portp, 0);
 }
@@ -1563,10 +1563,10 @@ static void stl_unthrottle(struct tty_struct *tty)
 
         pr_debug("stl_unthrottle(tty=%p)\n", tty);
 
-        if (tty == (struct tty_struct *) NULL)
+        if (tty == NULL)
                 return;
         portp = tty->driver_data;
-        if (portp == (stlport_t *) NULL)
+        if (portp == NULL)
                 return;
         stl_flowctrl(portp, 1);
 }
@@ -1584,10 +1584,10 @@ static void stl_stop(struct tty_struct *tty)
 
         pr_debug("stl_stop(tty=%p)\n", tty);
 
-        if (tty == (struct tty_struct *) NULL)
+        if (tty == NULL)
                 return;
         portp = tty->driver_data;
-        if (portp == (stlport_t *) NULL)
+        if (portp == NULL)
                 return;
         stl_startrxtx(portp, -1, 0);
 }
@@ -1604,10 +1604,10 @@ static void stl_start(struct tty_struct *tty)
 
         pr_debug("stl_start(tty=%p)\n", tty);
 
-        if (tty == (struct tty_struct *) NULL)
+        if (tty == NULL)
                 return;
         portp = tty->driver_data;
-        if (portp == (stlport_t *) NULL)
+        if (portp == NULL)
                 return;
         stl_startrxtx(portp, -1, 1);
 }
@@ -1626,10 +1626,10 @@ static void stl_hangup(struct tty_struct *tty)
 
         pr_debug("stl_hangup(tty=%p)\n", tty);
 
-        if (tty == (struct tty_struct *) NULL)
+        if (tty == NULL)
                 return;
         portp = tty->driver_data;
-        if (portp == (stlport_t *) NULL)
+        if (portp == NULL)
                 return;
 
         portp->flags &= ~ASYNC_INITIALIZED;
@@ -1640,13 +1640,13 @@ static void stl_hangup(struct tty_struct *tty)
         stl_flushbuffer(tty);
         portp->istate = 0;
         set_bit(TTY_IO_ERROR, &tty->flags);
-        if (portp->tx.buf != (char *) NULL) {
+        if (portp->tx.buf != NULL) {
                 kfree(portp->tx.buf);
-                portp->tx.buf = (char *) NULL;
-                portp->tx.head = (char *) NULL;
-                portp->tx.tail = (char *) NULL;
+                portp->tx.buf = NULL;
+                portp->tx.head = NULL;
+                portp->tx.tail = NULL;
         }
-        portp->tty = (struct tty_struct *) NULL;
+        portp->tty = NULL;
         portp->flags &= ~ASYNC_NORMAL_ACTIVE;
         portp->refcount = 0;
         wake_up_interruptible(&portp->open_wait);
@@ -1660,10 +1660,10 @@ static void stl_flushbuffer(struct tty_struct *tty)
 
         pr_debug("stl_flushbuffer(tty=%p)\n", tty);
 
-        if (tty == (struct tty_struct *) NULL)
+        if (tty == NULL)
                 return;
         portp = tty->driver_data;
-        if (portp == (stlport_t *) NULL)
+        if (portp == NULL)
                 return;
 
         stl_flush(portp);
@@ -1678,10 +1678,10 @@ static void stl_breakctl(struct tty_struct *tty, int state)
 
         pr_debug("stl_breakctl(tty=%p,state=%d)\n", tty, state);
 
-        if (tty == (struct tty_struct *) NULL)
+        if (tty == NULL)
                 return;
         portp = tty->driver_data;
-        if (portp == (stlport_t *) NULL)
+        if (portp == NULL)
                 return;
 
         stl_sendbreak(portp, ((state == -1) ? 1 : 2));
@@ -1696,10 +1696,10 @@ static void stl_waituntilsent(struct tty_struct *tty, int timeout)
 
         pr_debug("stl_waituntilsent(tty=%p,timeout=%d)\n", tty, timeout);
 
-        if (tty == (struct tty_struct *) NULL)
+        if (tty == NULL)
                 return;
         portp = tty->driver_data;
-        if (portp == (stlport_t *) NULL)
+        if (portp == NULL)
                 return;
 
         if (timeout == 0)
@@ -1723,10 +1723,10 @@ static void stl_sendxchar(struct tty_struct *tty, char ch)
 
         pr_debug("stl_sendxchar(tty=%p,ch=%x)\n", tty, ch);
 
-        if (tty == (struct tty_struct *) NULL)
+        if (tty == NULL)
                 return;
         portp = tty->driver_data;
-        if (portp == (stlport_t *) NULL)
+        if (portp == NULL)
                 return;
 
         if (ch == STOP_CHAR(tty))
@@ -1822,7 +1822,7 @@ static int stl_readproc(char *page, char **start, off_t off, int count, int *eof
  */
         for (brdnr = 0; (brdnr < stl_nrbrds); brdnr++) {
                 brdp = stl_brds[brdnr];
-                if (brdp == (stlbrd_t *) NULL)
+                if (brdp == NULL)
                         continue;
                 if (brdp->state == 0)
                         continue;
@@ -1836,7 +1836,7 @@ static int stl_readproc(char *page, char **start, off_t off, int count, int *eof
                 totalport = brdnr * STL_MAXPORTS;
                 for (panelnr = 0; (panelnr < brdp->nrpanels); panelnr++) {
                         panelp = brdp->panels[panelnr];
-                        if (panelp == (stlpanel_t *) NULL)
+                        if (panelp == NULL)
                                 continue;
 
                         maxoff = curoff + (panelp->nrports * MAXLINE);
@@ -1849,7 +1849,7 @@ static int stl_readproc(char *page, char **start, off_t off, int count, int *eof
                         for (portnr = 0; (portnr < panelp->nrports); portnr++,
                             totalport++) {
                                 portp = panelp->ports[portnr];
-                                if (portp == (stlport_t *) NULL)
+                                if (portp == NULL)
                                         continue;
                                 if (off >= (curoff += MAXLINE))
                                         continue;
@@ -1876,7 +1876,7 @@ stl_readdone:
 
 static irqreturn_t stl_intr(int irq, void *dev_id)
 {
-        stlbrd_t        *brdp = (stlbrd_t *) dev_id;
+        stlbrd_t *brdp = dev_id;
 
         pr_debug("stl_intr(brdp=%p,irq=%d)\n", brdp, irq);
 
@@ -2034,11 +2034,11 @@ static void stl_offintr(struct work_struct *work)
 
         pr_debug("stl_offintr(portp=%p)\n", portp);
 
-        if (portp == (stlport_t *) NULL)
+        if (portp == NULL)
                 return;
 
         tty = portp->tty;
-        if (tty == (struct tty_struct *) NULL)
+        if (tty == NULL)
                 return;
 
         lock_kernel();
@@ -2227,10 +2227,10 @@ static inline int stl_initeio(stlbrd_t *brdp)
         panelp->iobase = brdp->ioaddr1;
         panelp->hwid = status;
         if ((status & EIO_IDBITMASK) == EIO_MK3) {
-                panelp->uartp = (void *) &stl_sc26198uart;
+                panelp->uartp = &stl_sc26198uart;
                 panelp->isr = stl_sc26198intr;
         } else {
-                panelp->uartp = (void *) &stl_cd1400uart;
+                panelp->uartp = &stl_cd1400uart;
                 panelp->isr = stl_cd1400eiointr;
         }
 
@@ -2402,7 +2402,7 @@ static inline int stl_initech(stlbrd_t *brdp)
                 brdp->bnkstataddr[banknr++] = ioaddr + ECH_PNLSTATUS;
 
                 if (status & ECH_PNLXPID) {
-                        panelp->uartp = (void *) &stl_sc26198uart;
+                        panelp->uartp = &stl_sc26198uart;
                         panelp->isr = stl_sc26198intr;
                         if (status & ECH_PNL16PORT) {
                                 panelp->nrports = 16;
@@ -2414,7 +2414,7 @@ static inline int stl_initech(stlbrd_t *brdp)
                                 panelp->nrports = 8;
                         }
                 } else {
-                        panelp->uartp = (void *) &stl_cd1400uart;
+                        panelp->uartp = &stl_cd1400uart;
                         panelp->isr = stl_cd1400echintr;
                         if (status & ECH_PNL16PORT) {
                                 panelp->nrports = 16;
@@ -2498,7 +2498,7 @@ static int __init stl_brdinit(stlbrd_t *brdp)
         }
 
         for (i = 0; (i < STL_MAXPANELS); i++)
-                if (brdp->panels[i] != (stlpanel_t *) NULL)
+                if (brdp->panels[i] != NULL)
                         stl_initports(brdp, brdp->panels[i]);
 
         printk("STALLION: %s found, board=%d io=%x irq=%d "
@@ -2519,7 +2519,7 @@ static inline int stl_getbrdnr(void)
         int     i;
 
         for (i = 0; (i < STL_MAXBRDS); i++) {
-                if (stl_brds[i] == (stlbrd_t *) NULL) {
+                if (stl_brds[i] == NULL) {
                         if (i >= stl_nrbrds)
                                 stl_nrbrds = i + 1;
                         return(i);
@@ -2547,7 +2547,7 @@ static inline int stl_initpcibrd(int brdtype, struct pci_dev *devp)
 
         if (pci_enable_device(devp))
                 return(-EIO);
-        if ((brdp = stl_allocbrd()) == (stlbrd_t *) NULL)
+        if ((brdp = stl_allocbrd()) == NULL)
                 return(-ENOMEM);
         if ((brdp->brdnr = stl_getbrdnr()) < 0) {
                 printk("STALLION: too many boards found, "
@@ -2657,7 +2657,7 @@ static inline int stl_initbrds(void)
         for (i = 0; (i < stl_nrbrds); i++) {
                 confp = &stl_brdconf[i];
                 stl_parsebrd(confp, stl_brdsp[i]);
-                if ((brdp = stl_allocbrd()) == (stlbrd_t *) NULL)
+                if ((brdp = stl_allocbrd()) == NULL)
                         return(-ENOMEM);
                 brdp->brdnr = i;
                 brdp->brdtype = confp->brdtype;
@@ -2697,7 +2697,7 @@ static int stl_getbrdstats(combrd_t __user *bp)
         if (stl_brdstats.brd >= STL_MAXBRDS)
                 return(-ENODEV);
         brdp = stl_brds[stl_brdstats.brd];
-        if (brdp == (stlbrd_t *) NULL)
+        if (brdp == NULL)
                 return(-ENODEV);
 
         memset(&stl_brdstats, 0, sizeof(combrd_t));
@@ -2732,17 +2732,17 @@ static stlport_t *stl_getport(int brdnr, int panelnr, int portnr)
         stlpanel_t      *panelp;
 
         if ((brdnr < 0) || (brdnr >= STL_MAXBRDS))
-                return((stlport_t *) NULL);
+                return(NULL);
         brdp = stl_brds[brdnr];
-        if (brdp == (stlbrd_t *) NULL)
-                return((stlport_t *) NULL);
+        if (brdp == NULL)
+                return(NULL);
         if ((panelnr < 0) || (panelnr >= brdp->nrpanels))
-                return((stlport_t *) NULL);
+                return(NULL);
         panelp = brdp->panels[panelnr];
-        if (panelp == (stlpanel_t *) NULL)
-                return((stlport_t *) NULL);
+        if (panelp == NULL)
+                return(NULL);
         if ((portnr < 0) || (portnr >= panelp->nrports))
-                return((stlport_t *) NULL);
+                return(NULL);
         return(panelp->ports[portnr]);
 }
 
@@ -2764,7 +2764,7 @@ static int stl_getportstats(stlport_t *portp, comstats_t __user *cp)
                         return -EFAULT;
                 portp = stl_getport(stl_comstats.brd, stl_comstats.panel,
                         stl_comstats.port);
-                if (portp == (stlport_t *) NULL)
+                if (portp == NULL)
                         return(-ENODEV);
         }
 
@@ -2780,12 +2780,12 @@ static int stl_getportstats(stlport_t *portp, comstats_t __user *cp)
         portp->stats.rxbuffered = 0;
 
         spin_lock_irqsave(&stallion_lock, flags);
-        if (portp->tty != (struct tty_struct *) NULL) {
+        if (portp->tty != NULL) {
                 if (portp->tty->driver_data == portp) {
                         portp->stats.ttystate = portp->tty->flags;
                         /* No longer available as a statistic */
                         portp->stats.rxbuffered = 1; /*portp->tty->flip.count; */
-                        if (portp->tty->termios != (struct termios *) NULL) {
+                        if (portp->tty->termios != NULL) {
                                 portp->stats.cflags = portp->tty->termios->c_cflag;
                                 portp->stats.iflags = portp->tty->termios->c_iflag;
                                 portp->stats.oflags = portp->tty->termios->c_oflag;
@@ -2819,7 +2819,7 @@ static int stl_clrportstats(stlport_t *portp, comstats_t __user *cp)
                         return -EFAULT;
                 portp = stl_getport(stl_comstats.brd, stl_comstats.panel,
                         stl_comstats.port);
-                if (portp == (stlport_t *) NULL)
+                if (portp == NULL)
                         return(-ENODEV);
         }
 
@@ -3090,8 +3090,8 @@ static void stl_cd1400portinit(stlbrd_t *brdp, stlpanel_t *panelp, stlport_t *po
         pr_debug("stl_cd1400portinit(brdp=%p,panelp=%p,portp=%p)\n", brdp,
                         panelp, portp);
 
-        if ((brdp == (stlbrd_t *) NULL) || (panelp == (stlpanel_t *) NULL) ||
-            (portp == (stlport_t *) NULL))
+        if ((brdp == NULL) || (panelp == NULL) ||
+            (portp == NULL))
                 return;
 
         spin_lock_irqsave(&brd_lock, flags);
@@ -3162,7 +3162,7 @@ static void stl_cd1400setport(stlport_t *portp, struct termios *tiosp)
         sreroff = 0;
 
         brdp = stl_brds[portp->brdnr];
-        if (brdp == (stlbrd_t *) NULL)
+        if (brdp == NULL)
                 return;
 
 /*
@@ -3546,10 +3546,10 @@ static void stl_cd1400flowctrl(stlport_t *portp, int state)
 
         pr_debug("stl_cd1400flowctrl(portp=%p,state=%x)\n", portp, state);
 
-        if (portp == (stlport_t *) NULL)
+        if (portp == NULL)
                 return;
         tty = portp->tty;
-        if (tty == (struct tty_struct *) NULL)
+        if (tty == NULL)
                 return;
 
         spin_lock_irqsave(&brd_lock, flags);
@@ -3608,10 +3608,10 @@ static void stl_cd1400sendflow(stlport_t *portp, int state)
 
         pr_debug("stl_cd1400sendflow(portp=%p,state=%x)\n", portp, state);
 
-        if (portp == (stlport_t *) NULL)
+        if (portp == NULL)
                 return;
         tty = portp->tty;
-        if (tty == (struct tty_struct *) NULL)
+        if (tty == NULL)
                 return;
 
         spin_lock_irqsave(&brd_lock, flags);
@@ -3640,7 +3640,7 @@ static void stl_cd1400flush(stlport_t *portp)
 
         pr_debug("stl_cd1400flush(portp=%p)\n", portp);
 
-        if (portp == (stlport_t *) NULL)
+        if (portp == NULL)
                 return;
 
         spin_lock_irqsave(&brd_lock, flags);
@@ -3667,7 +3667,7 @@ static int stl_cd1400datastate(stlport_t *portp)
 {
         pr_debug("stl_cd1400datastate(portp=%p)\n", portp);
 
-        if (portp == (stlport_t *) NULL)
+        if (portp == NULL)
                 return 0;
 
         return test_bit(ASYI_TXBUSY, &portp->istate) ? 1 : 0;
@@ -4092,8 +4092,8 @@ static void stl_sc26198portinit(stlbrd_t *brdp, stlpanel_t *panelp, stlport_t *p
         pr_debug("stl_sc26198portinit(brdp=%p,panelp=%p,portp=%p)\n", brdp,
                         panelp, portp);
 
-        if ((brdp == (stlbrd_t *) NULL) || (panelp == (stlpanel_t *) NULL) ||
-            (portp == (stlport_t *) NULL))
+        if ((brdp == NULL) || (panelp == NULL) ||
+            (portp == NULL))
                 return;
 
         portp->ioaddr = panelp->iobase + ((portp->portnr < 8) ? 0 : 4);
@@ -4130,7 +4130,7 @@ static void stl_sc26198setport(stlport_t *portp, struct termios *tiosp)
         imroff = 0;
 
         brdp = stl_brds[portp->brdnr];
-        if (brdp == (stlbrd_t *) NULL)
+        if (brdp == NULL)
                 return;
 
 /*
@@ -4482,10 +4482,10 @@ static void stl_sc26198flowctrl(stlport_t *portp, int state)
 
         pr_debug("stl_sc26198flowctrl(portp=%p,state=%x)\n", portp, state);
 
-        if (portp == (stlport_t *) NULL)
+        if (portp == NULL)
                 return;
         tty = portp->tty;
-        if (tty == (struct tty_struct *) NULL)
+        if (tty == NULL)
                 return;
 
         spin_lock_irqsave(&brd_lock, flags);
@@ -4551,10 +4551,10 @@ static void stl_sc26198sendflow(stlport_t *portp, int state)
 
         pr_debug("stl_sc26198sendflow(portp=%p,state=%x)\n", portp, state);
 
-        if (portp == (stlport_t *) NULL)
+        if (portp == NULL)
                 return;
         tty = portp->tty;
-        if (tty == (struct tty_struct *) NULL)
+        if (tty == NULL)
                 return;
 
         spin_lock_irqsave(&brd_lock, flags);
@@ -4588,7 +4588,7 @@ static void stl_sc26198flush(stlport_t *portp)
 
         pr_debug("stl_sc26198flush(portp=%p)\n", portp);
 
-        if (portp == (stlport_t *) NULL)
+        if (portp == NULL)
                 return;
 
         spin_lock_irqsave(&brd_lock, flags);
@@ -4617,7 +4617,7 @@ static int stl_sc26198datastate(stlport_t *portp)
 
         pr_debug("stl_sc26198datastate(portp=%p)\n", portp);
 
-        if (portp == (stlport_t *) NULL)
+        if (portp == NULL)
                 return 0;
         if (test_bit(ASYI_TXBUSY, &portp->istate))
                 return 1;
@@ -4644,7 +4644,7 @@ static void stl_sc26198wait(stlport_t *portp)
 
         pr_debug("stl_sc26198wait(portp=%p)\n", portp);
 
-        if (portp == (stlport_t *) NULL)
+        if (portp == NULL)
                 return;
 
         for (i = 0; (i < 20); i++)
@@ -4816,8 +4816,8 @@ static void stl_sc26198rxisr(stlport_t *portp, unsigned int iack)
  *      flow control modes of the sc26198.
  */
         if (test_bit(ASYI_TXFLOWED, &portp->istate)) {
-                if ((tty != (struct tty_struct *) NULL) &&
-                    (tty->termios != (struct termios *) NULL) &&
+                if ((tty != NULL) &&
+                    (tty->termios != NULL) &&
                     (tty->termios->c_iflag & IXANY)) {
                         stl_sc26198txunflow(portp, tty);
                 }
@@ -4847,7 +4847,7 @@ static inline void stl_sc26198rxbadch(stlport_t *portp, unsigned char status, ch
         if (status & SR_RXBREAK)
                 portp->stats.rxbreaks++;
 
-        if ((tty != (struct tty_struct *) NULL) &&
+        if ((tty != NULL) &&
             ((portp->rxignoremsk & status) == 0)) {
                 if (portp->rxmarkmsk & status) {
                         if (status & SR_RXBREAK) {