[NET]: SH checksum annotations and cleanups.

* sanitize prototypes, annotate
* kill useless shifts
* usual ntohs->shift

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 29 insertions, 30 deletions

diff --git a/include/asm-sh/checksum.h b/include/asm-sh/checksum.h
index 08168afe6746..d44344c88e73 100644
--- a/include/asm-sh/checksum.h
+++ b/include/asm-sh/checksum.h
@@ -23,7 +23,7 @@
  *
  * it's best to have buff aligned on a 32-bit boundary
  */
-asmlinkage unsigned int csum_partial(const unsigned char * buff, int len, unsigned int sum);
+asmlinkage __wsum csum_partial(const void *buff, int len, __wsum sum);
 
 /*
  * the same as csum_partial, but copies from src while it
@@ -33,8 +33,8 @@ asmlinkage unsigned int csum_partial(const unsigned char * buff, int len, unsign
  * better 64-bit) boundary
  */
 
-asmlinkage unsigned int csum_partial_copy_generic(const unsigned char *src, unsigned char *dst,
-                                                  int len, int sum, int *src_err_ptr, int *dst_err_ptr);
+asmlinkage __wsum csum_partial_copy_generic(const void *src, void *dst,
+                                          int len, __wsum sum, int *src_err_ptr, int *dst_err_ptr);
 
 /*
  *      Note: when you get a NULL pointer exception here this means someone
@@ -44,24 +44,25 @@ asmlinkage unsigned int csum_partial_copy_generic(const unsigned char *src, unsi
  *      access_ok().
  */
 static __inline__
-unsigned int csum_partial_copy_nocheck (const unsigned char *src, unsigned char *dst,
-                                        int len, int sum)
+__wsum csum_partial_copy_nocheck(const void *src, void *dst,
+                                        int len, __wsum sum)
 {
         return csum_partial_copy_generic ( src, dst, len, sum, NULL, NULL);
 }
 
 static __inline__
-unsigned int csum_partial_copy_from_user (const unsigned char *src, unsigned char *dst,
-                                                int len, int sum, int *err_ptr)
+__wsum csum_partial_copy_from_user(const void __user *src, void *dst,
+                                                int len, __wsum sum, int *err_ptr)
 {
-        return csum_partial_copy_generic ( src, dst, len, sum, err_ptr, NULL);
+        return csum_partial_copy_generic((__force const void *)src, dst,
+                                        len, sum, err_ptr, NULL);
 }
 
 /*
  *      Fold a partial checksum
  */
 
-static __inline__ unsigned int csum_fold(unsigned int sum)
+static __inline__ __sum16 csum_fold(__wsum sum)
 {
         unsigned int __dummy;
         __asm__("swap.w %0, %1\n\t"
@@ -74,7 +75,7 @@ static __inline__ unsigned int csum_fold(unsigned int sum)
                 : "=r" (sum), "=&r" (__dummy)
                 : "0" (sum)
                 : "t");
-        return sum;
+        return (__force __sum16)sum;
 }
 
 /*
@@ -84,7 +85,7 @@ static __inline__ unsigned int csum_fold(unsigned int sum)
  *      i386 version by Jorge Cwik <jorge@laser.satlink.net>, adapted
  *      for linux by * Arnt Gulbrandsen.
  */
-static __inline__ unsigned short ip_fast_csum(unsigned char * iph, unsigned int ihl)
+static __inline__ __sum16 ip_fast_csum(const void *iph, unsigned int ihl)
 {
         unsigned int sum, __dummy0, __dummy1;
 
@@ -112,16 +113,15 @@ static __inline__ unsigned short ip_fast_csum(unsigned char * iph, unsigned int
         return  csum_fold(sum);
 }
 
-static __inline__ unsigned long csum_tcpudp_nofold(unsigned long saddr,
-                                                   unsigned long daddr,
+static __inline__ __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr,
                                                    unsigned short len,
                                                    unsigned short proto,
-                                                   unsigned int sum) 
+                                                   __wsum sum)
 {
 #ifdef __LITTLE_ENDIAN__
-        unsigned long len_proto = (ntohs(len)<<16)+proto*256;
+        unsigned long len_proto = (proto + len) << 8;
 #else
-        unsigned long len_proto = (proto<<16)+len;
+        unsigned long len_proto = proto + len;
 #endif
         __asm__("clrt\n\t"
                 "addc   %0, %1\n\t"
@@ -139,11 +139,10 @@ static __inline__ unsigned long csum_tcpudp_nofold(unsigned long saddr,
  * computes the checksum of the TCP/UDP pseudo-header
  * returns a 16-bit checksum, already complemented
  */
-static __inline__ unsigned short int csum_tcpudp_magic(unsigned long saddr,
-                                                       unsigned long daddr,
+static __inline__ __sum16 csum_tcpudp_magic(__be32 saddr, __be32 daddr,
                                                        unsigned short len,
                                                        unsigned short proto,
-                                                       unsigned int sum) 
+                                                       __wsum sum)
 {
         return csum_fold(csum_tcpudp_nofold(saddr,daddr,len,proto,sum));
 }
@@ -153,18 +152,17 @@ static __inline__ unsigned short int csum_tcpudp_magic(unsigned long saddr,
  * in icmp.c
  */
 
-static __inline__ unsigned short ip_compute_csum(unsigned char * buff, int len)
+static __inline__ __sum16 ip_compute_csum(const void *buff, int len)
 {
     return csum_fold (csum_partial(buff, len, 0));
 }
 
 #define _HAVE_ARCH_IPV6_CSUM
 #ifdef CONFIG_IPV6
-static __inline__ unsigned short int csum_ipv6_magic(struct in6_addr *saddr,
-                                                     struct in6_addr *daddr,
-                                                     __u32 len,
-                                                     unsigned short proto,
-                                                     unsigned int sum) 
+static __inline__ __sum16 csum_ipv6_magic(const struct in6_addr *saddr,
+                                          const struct in6_addr *daddr,
+                                          __u32 len, unsigned short proto,
+                                          __wsum sum)
 {
         unsigned int __dummy;
         __asm__("clrt\n\t"
@@ -201,17 +199,18 @@ static __inline__ unsigned short int csum_ipv6_magic(struct in6_addr *saddr,
  *      Copy and checksum to user
  */
 #define HAVE_CSUM_COPY_USER
-static __inline__ unsigned int csum_and_copy_to_user (const unsigned char *src,
-                                                      unsigned char __user *dst,
-                                                      int len, int sum,
+static __inline__ __wsum csum_and_copy_to_user (const void *src,
+                                                      void __user *dst,
+                                                      int len, __wsum sum,
                                                       int *err_ptr)
 {
         if (access_ok(VERIFY_WRITE, dst, len))
-                return csum_partial_copy_generic(src, dst, len, sum, NULL, err_ptr);
+                return csum_partial_copy_generic((__force const void *)src,
+                                                dst, len, sum, NULL, err_ptr);
 
         if (len)
                 *err_ptr = -EFAULT;
 
-        return -1; /* invalid checksum */
+        return (__force __wsum)-1; /* invalid checksum */
 }
 #endif /* __ASM_SH_CHECKSUM_H */