[NET]: Cris checksum annotations and cleanups.

* sanitize prototypes and annotate
* kill cast-as-lvalue abuses in csum_partial()
* usual ntohs-equals-shift for checksum purposes

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

4 files changed, 57 insertions, 59 deletions

diff --git a/arch/cris/arch-v10/lib/old_checksum.c b/arch/cris/arch-v10/lib/old_checksum.c
index 22a6f0aa9cef..497634a64829 100644
--- a/arch/cris/arch-v10/lib/old_checksum.c
+++ b/arch/cris/arch-v10/lib/old_checksum.c
@@ -47,39 +47,41 @@
 
 #include <asm/delay.h>
 
-unsigned int csum_partial(const unsigned char * buff, int len, unsigned int sum)
+__wsum csum_partial(const void *p, int len, __wsum __sum)
 {
-  /*
-   * Experiments with ethernet and slip connections show that buff
-   * is aligned on either a 2-byte or 4-byte boundary.
-   */
-  const unsigned char *endMarker = buff + len;
-  const unsigned char *marker = endMarker - (len % 16);
+        u32 sum = (__force u32)__sum;
+        const u16 *buff = p;
+        /*
+        * Experiments with ethernet and slip connections show that buff
+        * is aligned on either a 2-byte or 4-byte boundary.
+        */
+        const void *endMarker = p + len;
+        const void *marker = endMarker - (len % 16);
 #if 0
-  if((int)buff & 0x3)
-    printk("unaligned buff %p\n", buff);
-  __delay(900); /* extra delay of 90 us to test performance hit */
+        if((int)buff & 0x3)
+                printk("unaligned buff %p\n", buff);
+        __delay(900); /* extra delay of 90 us to test performance hit */
 #endif
-  BITON;
-  while (buff < marker) {
-    sum += *((unsigned short *)buff)++;
-    sum += *((unsigned short *)buff)++;
-    sum += *((unsigned short *)buff)++;
-    sum += *((unsigned short *)buff)++;
-    sum += *((unsigned short *)buff)++;
-    sum += *((unsigned short *)buff)++;
-    sum += *((unsigned short *)buff)++;
-    sum += *((unsigned short *)buff)++;
-  }
-  marker = endMarker - (len % 2);
-  while(buff < marker) {
-    sum += *((unsigned short *)buff)++;
-  }
-  if(endMarker - buff > 0) {
-    sum += *buff;                 /* add extra byte seperately */
-  }
-  BITOFF;
-  return(sum);
+        BITON;
+        while (buff < marker) {
+                sum += *buff++;
+                sum += *buff++;
+                sum += *buff++;
+                sum += *buff++;
+                sum += *buff++;
+                sum += *buff++;
+                sum += *buff++;
+                sum += *buff++;
+        }
+        marker = endMarker - (len % 2);
+        while (buff < marker)
+                sum += *buff++;
+
+        if (endMarker > buff)
+                sum += *(const u8 *)buff;       /* add extra byte seperately */
+
+        BITOFF;
+        return (__force __wsum)sum;
 }
 
 EXPORT_SYMBOL(csum_partial);
diff --git a/include/asm-cris/arch-v10/checksum.h b/include/asm-cris/arch-v10/checksum.h
index 633f234f336b..b8000c5d7fe1 100644
--- a/include/asm-cris/arch-v10/checksum.h
+++ b/include/asm-cris/arch-v10/checksum.h
@@ -8,11 +8,11 @@
  * to split all of those into 16-bit components, then add.
  */
 
-static inline unsigned int
-csum_tcpudp_nofold(unsigned long saddr, unsigned long daddr, unsigned short len,
-                   unsigned short proto, unsigned int sum)
+static inline __wsum
+csum_tcpudp_nofold(__be32 saddr, __be32 daddr, unsigned short len,
+                   unsigned short proto, __wsum sum)
 {
-        int res;
+        __wsum res;
         __asm__ ("add.d %2, %0\n\t"
                  "ax\n\t"
                  "add.d %3, %0\n\t"
@@ -21,7 +21,7 @@ csum_tcpudp_nofold(unsigned long saddr, unsigned long daddr, unsigned short len,
                  "ax\n\t"
                  "addq 0, %0\n"
         : "=r" (res)
-        : "0" (sum), "r" (daddr), "r" (saddr), "r" ((ntohs(len) << 16) + (proto << 8)));
+        : "0" (sum), "r" (daddr), "r" (saddr), "r" ((len + proto) << 8));
 
         return res;
 }       
diff --git a/include/asm-cris/arch-v32/checksum.h b/include/asm-cris/arch-v32/checksum.h
index 97ef89efea62..e5dcfce6e0dc 100644
--- a/include/asm-cris/arch-v32/checksum.h
+++ b/include/asm-cris/arch-v32/checksum.h
@@ -9,11 +9,11 @@
  * checksum. Which means it would be necessary to split all those into
  * 16-bit components and then add.
  */
-static inline unsigned int
-csum_tcpudp_nofold(unsigned long saddr, unsigned long daddr,
-                   unsigned short len, unsigned short proto, unsigned int sum)
+static inline __wsum
+csum_tcpudp_nofold(__be32 saddr, __be32 daddr,
+                   unsigned short len, unsigned short proto, __wsum sum)
 {
-        int res;
+        __wsum res;
 
         __asm__ __volatile__ ("add.d %2, %0\n\t"
                               "addc %3, %0\n\t"
@@ -21,7 +21,7 @@ csum_tcpudp_nofold(unsigned long saddr, unsigned long daddr,
                               "addc 0, %0\n\t"
                               : "=r" (res)
                               : "0" (sum), "r" (daddr), "r" (saddr), \
-                              "r" ((ntohs(len) << 16) + (proto << 8)));
+                              "r" ((len + proto) << 8));
 
         return res;
 }
diff --git a/include/asm-cris/checksum.h b/include/asm-cris/checksum.h
index 26a7719bbb84..180dbf2757b0 100644
--- a/include/asm-cris/checksum.h
+++ b/include/asm-cris/checksum.h
@@ -17,7 +17,7 @@
  *
  * it's best to have buff aligned on a 32-bit boundary
  */
-unsigned int csum_partial(const unsigned char * buff, int len, unsigned int sum);
+__wsum csum_partial(const void *buff, int len, __wsum sum);
 
 /*
  * the same as csum_partial, but copies from src while it
@@ -27,26 +27,23 @@ unsigned int csum_partial(const unsigned char * buff, int len, unsigned int sum)
  * better 64-bit) boundary
  */
 
-unsigned int csum_partial_copy_nocheck(const char *src, char *dst,
-                                       int len, unsigned int sum);
+__wsum csum_partial_copy_nocheck(const void *src, void *dst,
+                                       int len, __wsum sum);
 
 /*
  *      Fold a partial checksum into a word
  */
 
-static inline unsigned int csum_fold(unsigned int sum)
+static inline __sum16 csum_fold(__wsum csum)
 {
-        /* the while loop is unnecessary really, it's always enough with two
-           iterations */
-        
-        while(sum >> 16)
-                sum = (sum & 0xffff) + (sum >> 16); /* add in end-around carry */
-        
-        return ~sum;
+        u32 sum = (__force u32)csum;
+        sum = (sum & 0xffff) + (sum >> 16); /* add in end-around carry */
+        sum = (sum & 0xffff) + (sum >> 16); /* add in end-around carry */
+        return (__force __sum16)~sum;
 }
 
-extern unsigned int csum_partial_copy_from_user(const char *src, char *dst,
-                                                int len, unsigned int sum, 
+extern __wsum csum_partial_copy_from_user(const void __user *src, void *dst,
+                                                int len, __wsum sum,
                                                 int *errptr);
 
 /*
@@ -55,8 +52,7 @@ extern unsigned int csum_partial_copy_from_user(const char *src, char *dst,
  *
  */
 
-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)
 {
         return csum_fold(csum_partial(iph, ihl * 4, 0));
 }
@@ -66,11 +62,10 @@ static inline unsigned short ip_fast_csum(unsigned char * iph,
  * returns a 16-bit checksum, already complemented
  */
 
-static inline unsigned short int csum_tcpudp_magic(unsigned long saddr,
-                                                   unsigned long daddr,
+static inline __sum16 int 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));
 }
@@ -80,7 +75,8 @@ 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));
 }