1 files changed, 9 insertions, 10 deletions

diff --git a/drivers/usb/serial/mos7720.c b/drivers/usb/serial/mos7720.c
index 6ba87e6e28c3..b563e2ad8728 100644
--- a/drivers/usb/serial/mos7720.c
+++ b/drivers/usb/serial/mos7720.c
@@ -103,11 +103,9 @@ static void mos7720_interrupt_callback(struct urb *urb)
 {
         int result;
         int length;
-        __u32 *data;
-        unsigned int status;
+        __u8 *data;
         __u8 sp1;
         __u8 sp2;
-        __u8 st;
 
         dbg("%s"," : Entering\n");
 
@@ -141,18 +139,19 @@ static void mos7720_interrupt_callback(struct urb *urb)
          * Byte 2 IIR Port 2 (port.number is 1)
          * Byte 3 --------------
          * Byte 4 FIFO status for both */
-        if (length && length > 4) {
+
+        /* the above description is inverted
+         *      oneukum 2007-03-14 */
+
+        if (unlikely(length != 4)) {
                 dbg("Wrong data !!!");
                 return;
         }
 
-        status = *data;
-
-        sp1 = (status & 0xff000000)>>24;
-        sp2 = (status & 0x00ff0000)>>16;
-        st = status & 0x000000ff;
+        sp1 = data[3];
+        sp2 = data[2];
 
-        if ((sp1 & 0x01) || (sp2 & 0x01)) {
+        if ((sp1 | sp2) & 0x01) {
                 /* No Interrupt Pending in both the ports */
                 dbg("No Interrupt !!!");
         } else {