2 files changed, 4 insertions, 14 deletions

diff --git a/drivers/atm/Kconfig b/drivers/atm/Kconfig
index cfa5af883e13..2ddd76fdbc43 100644
--- a/drivers/atm/Kconfig
+++ b/drivers/atm/Kconfig
@@ -242,6 +242,7 @@ config ATM_IDT77252_USE_SUNI
 config ATM_AMBASSADOR
         tristate "Madge Ambassador (Collage PCI 155 Server)"
         depends on PCI && ATM
+        select BITREVERSE
         help
           This is a driver for ATMizer based ATM card produced by Madge
           Networks Ltd. Say Y (or M to compile as a module named ambassador)
diff --git a/drivers/atm/ambassador.c b/drivers/atm/ambassador.c
index afa7d750a593..3c372e08f77d 100644
--- a/drivers/atm/ambassador.c
+++ b/drivers/atm/ambassador.c
@@ -32,6 +32,7 @@
 #include <linux/delay.h>
 #include <linux/interrupt.h>
 #include <linux/poison.h>
+#include <linux/bitrev.h>
 
 #include <asm/atomic.h>
 #include <asm/io.h>
@@ -2068,18 +2069,6 @@ static void __devinit amb_ucode_version (amb_dev * dev) {
   PRINTK (KERN_INFO, "microcode version is %u.%u", major, minor);
 }
   
-// swap bits within byte to get Ethernet ordering
-static u8 bit_swap (u8 byte)
-{
-    const u8 swap[] = {
-      0x0, 0x8, 0x4, 0xc,
-      0x2, 0xa, 0x6, 0xe,
-      0x1, 0x9, 0x5, 0xd,
-      0x3, 0xb, 0x7, 0xf
-    };
-    return ((swap[byte & 0xf]<<4) | swap[byte>>4]);
-}
-
 // get end station address
 static void __devinit amb_esi (amb_dev * dev, u8 * esi) {
   u32 lower4;
@@ -2101,9 +2090,9 @@ static void __devinit amb_esi (amb_dev * dev, u8 * esi) {
     PRINTDB (DBG_INIT, "ESI:");
     for (i = 0; i < ESI_LEN; ++i) {
       if (i < 4)
-          esi[i] = bit_swap (lower4>>(8*i));
+          esi[i] = bitrev8(lower4>>(8*i));
       else
-          esi[i] = bit_swap (upper2>>(8*(i-4)));
+          esi[i] = bitrev8(upper2>>(8*(i-4)));
       PRINTDM (DBG_INIT, " %02x", esi[i]);
     }