Use kernel crc32 for BlueZ BNEP

This patch modifies the BlueZ BNEP layer to use the CRC32 code from
the lib/ directory.

lib/Makefile

@@ -29,5 +29,6 @@ obj-$(CONFIG_ZLIB_DEFLATE) += zlib_deflate/
 include $(TOPDIR)/drivers/net/Makefile.lib
 include $(TOPDIR)/drivers/usb/class/Makefile.lib
 include $(TOPDIR)/fs/Makefile.lib
+include $(TOPDIR)/net/bluetooth/bnep/Makefile.lib
 
 include $(TOPDIR)/Rules.make

net/bluetooth/bnep/Makefile

@@ -4,6 +4,6 @@
 
 obj-$(CONFIG_BT_BNEP) += bnep.o
 
-bnep-objs := core.o sock.o netdev.o crc32.o
+bnep-objs := core.o sock.o netdev.o
 
 include $(TOPDIR)/Rules.make

net/bluetooth/bnep/Makefile.lib

+obj-$(CONFIG_BT_BNEP) += crc32.o

net/bluetooth/bnep/bnep.h

@@ -24,10 +24,9 @@
 #define _BNEP_H
 
 #include <linux/types.h>
+#include <linux/crc32.h>
 #include <net/bluetooth/bluetooth.h>
 
-#include "crc32.h"
-
 // Limits
 #define BNEP_MAX_PROTO_FILTERS     5
 #define BNEP_MAX_MULTICAST_FILTERS 20
@@ -179,7 +178,7 @@ int bnep_sock_cleanup(void);
 
 static inline int bnep_mc_hash(__u8 *addr)
 {
-        return (bnep_crc32(~0, addr, ETH_ALEN) >> 26);
+        return (crc32_be(~0, addr, ETH_ALEN) >> 26);
 }
 
 #endif

net/bluetooth/bnep/core.c

@@ -712,16 +712,12 @@ static int __init bnep_init_module(void)
 
 	bnep_sock_init();
 
-	bnep_crc32_init();
-
 	return 0;
 }
 
 static void __exit bnep_cleanup_module(void)
 {
 	bnep_sock_cleanup();
-
-	bnep_crc32_cleanup();
 }
 
 module_init(bnep_init_module);

net/bluetooth/bnep/crc32.c

-/* 
- * Based on linux-2.5/lib/crc32 by Matt Domsch <Matt_Domsch@dell.com>
- *
- * FIXME: Remove in 2.5  
- */
-
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/types.h>
-#include <linux/slab.h>
-#include <linux/init.h>
-#include <asm/atomic.h>
-
-#include "crc32.h"
-
-#define CRCPOLY_BE 0x04c11db7
-#define CRC_BE_BITS 8
-
-static u32 *bnep_crc32_table;
-
-/*
- * This code is in the public domain; copyright abandoned.
- * Liability for non-performance of this code is limited to the amount
- * you paid for it.  Since it is distributed for free, your refund will
- * be very very small.  If it breaks, you get to keep both pieces.
- */
-u32 bnep_crc32(u32 crc, unsigned char const *p, size_t len)
-{
-	while (len--)
-		crc = (crc << 8) ^ bnep_crc32_table[(crc >> 24) ^ *p++];
-	
-	return crc;
-}
-
-int __init bnep_crc32_init(void)
-{
-	unsigned i, j;
-	u32 crc = 0x80000000;
-
-	bnep_crc32_table = kmalloc((1 << CRC_BE_BITS) * sizeof(u32), GFP_KERNEL);
-	if (!bnep_crc32_table)
-		return -ENOMEM;
-
-	bnep_crc32_table[0] = 0;
-
-	for (i = 1; i < 1 << CRC_BE_BITS; i <<= 1) {
-		crc = (crc << 1) ^ ((crc & 0x80000000) ? CRCPOLY_BE : 0);
-		for (j = 0; j < i; j++)
-			bnep_crc32_table[i + j] = crc ^ bnep_crc32_table[j];
-	}
-	return 0;
-}
-
-void __exit bnep_crc32_cleanup(void)
-{
-	if (bnep_crc32_table)
-		kfree(bnep_crc32_table);
-	bnep_crc32_table = NULL;
-}

net/bluetooth/bnep/crc32.h

-/*
- * crc32.h
- * See crc32.c for license and changes
- *
- * FIXME: Remove in 2.5
- */
-
-int  bnep_crc32_init(void);
-void bnep_crc32_cleanup(void);
-u32  bnep_crc32(u32 crc, unsigned char const *p, size_t len);