spelling: s/trough/through/

Additionally, one comment was reformulated by Joe Perches <joe@perches.com>.

Signed-off-by: Adrian Bunk <bunk@stusta.de>
diff --git a/drivers/cdrom/cm206.c b/drivers/cdrom/cm206.c
index 01f0351..ce127f7 100644
--- a/drivers/cdrom/cm206.c
+++ b/drivers/cdrom/cm206.c
@@ -32,7 +32,7 @@
  18 mrt 1995: 0.24 Working background read-ahead. (still problems)
  26 mrt 1995: 0.25 Multi-session ioctl added (kernel v1.2).
               Statistics implemented, though separate stats206.h.
-	      Accessible trough ioctl 0x1000 (just a number).
+	      Accessible through ioctl 0x1000 (just a number).
 	      Hard to choose between v1.2 development and 1.1.75.
 	      Bottom-half doesn't work with 1.2...
 	      0.25a: fixed... typo. Still problems...
diff --git a/drivers/net/pcmcia/xirc2ps_cs.c b/drivers/net/pcmcia/xirc2ps_cs.c
index 049c34b..593d8ad 100644
--- a/drivers/net/pcmcia/xirc2ps_cs.c
+++ b/drivers/net/pcmcia/xirc2ps_cs.c
@@ -1598,7 +1598,7 @@
     switch(cmd) {
       case SIOCGMIIPHY:		/* Get the address of the PHY in use. */
 	data[0] = 0;		/* we have only this address */
-	/* fall trough */
+	/* fall through */
       case SIOCGMIIREG:		/* Read the specified MII register. */
 	data[3] = mii_rd(ioaddr, data[0] & 0x1f, data[1] & 0x1f);
 	break;
diff --git a/drivers/parisc/led.c b/drivers/parisc/led.c
index 95bd07b..315be47 100644
--- a/drivers/parisc/led.c
+++ b/drivers/parisc/led.c
@@ -347,7 +347,7 @@
    ** 
    ** led_get_net_activity()
    ** 
-   ** calculate if there was TX- or RX-troughput on the network interfaces
+   ** calculate if there was TX- or RX-throughput on the network interfaces
    ** (analog to dev_get_info() from net/core/dev.c)
    **   
  */
diff --git a/drivers/usb/serial/usb-serial.c b/drivers/usb/serial/usb-serial.c
index 8bc8337..4dd6865 100644
--- a/drivers/usb/serial/usb-serial.c
+++ b/drivers/usb/serial/usb-serial.c
@@ -584,7 +584,7 @@
 	const struct usb_device_id *id;
 	struct usb_serial_driver *t;
 
-	/* List trough know devices and see if the usb id matches */
+	/* Check if the usb id matches a known device */
 	list_for_each(p, &usb_serial_driver_list) {
 		t = list_entry(p, struct usb_serial_driver, driver_list);
 		id = usb_match_id(iface, t->id_table);