m68k: get rid of zeroing destination on error in csum_and_copy_from_user()

[linux-2.6-microblaze.git] / arch / m68k / lib / checksum.c

diff --git a/arch/m68k/lib/checksum.c b/arch/m68k/lib/checksum.c
index 3aeca26..7e6afea 100644 (file)
--- a/arch/m68k/lib/checksum.c
+++ b/arch/m68k/lib/checksum.c
@@ -236,82 +236,33 @@ csum_and_copy_from_user(const void __user *src, void *dst, int len)
                "clrl %5\n\t"
                "addxl %5,%0\n\t"       /* add X bit */
             "7:\t"
-               "clrl %5\n"             /* no error - clear return value */
-            "8:\n"
                ".section .fixup,\"ax\"\n"
                ".even\n"
-               /* If any exception occurs zero out the rest.
-                  Similarities with the code above are intentional :-) */
+               /* If any exception occurs, return 0 */
             "90:\t"
-               "clrw %3@+\n\t"
-               "movel %1,%4\n\t"
-               "lsrl #5,%1\n\t"
-               "jeq 1f\n\t"
-               "subql #1,%1\n"
-            "91:\t"
-               "clrl %3@+\n"
-            "92:\t"
-               "clrl %3@+\n"
-            "93:\t"
-               "clrl %3@+\n"
-            "94:\t"
-               "clrl %3@+\n"
-            "95:\t"
-               "clrl %3@+\n"
-            "96:\t"
-               "clrl %3@+\n"
-            "97:\t"
-               "clrl %3@+\n"
-            "98:\t"
-               "clrl %3@+\n\t"
-               "dbra %1,91b\n\t"
-               "clrw %1\n\t"
-               "subql #1,%1\n\t"
-               "jcc 91b\n"
-            "1:\t"
-               "movel %4,%1\n\t"
-               "andw #0x1c,%4\n\t"
-               "jeq 1f\n\t"
-               "lsrw #2,%4\n\t"
-               "subqw #1,%4\n"
-            "99:\t"
-               "clrl %3@+\n\t"
-               "dbra %4,99b\n\t"
-            "1:\t"
-               "andw #3,%1\n\t"
-               "jeq 9f\n"
-            "100:\t"
-               "clrw %3@+\n\t"
-               "tstw %1\n\t"
-               "jeq 9f\n"
-            "101:\t"
-               "clrb %3@+\n"
-            "9:\t"
-#define STR(X) STR1(X)
-#define STR1(X) #X
-               "moveq #-" STR(EFAULT) ",%5\n\t"
-               "jra 8b\n"
+               "clrl %0\n"
+               "jra 7b\n"
                ".previous\n"
                ".section __ex_table,\"a\"\n"
                ".long 10b,90b\n"
-               ".long 11b,91b\n"
-               ".long 12b,92b\n"
-               ".long 13b,93b\n"
-               ".long 14b,94b\n"
-               ".long 15b,95b\n"
-               ".long 16b,96b\n"
-               ".long 17b,97b\n"
-               ".long 18b,98b\n"
-               ".long 19b,99b\n"
-               ".long 20b,100b\n"
-               ".long 21b,101b\n"
+               ".long 11b,90b\n"
+               ".long 12b,90b\n"
+               ".long 13b,90b\n"
+               ".long 14b,90b\n"
+               ".long 15b,90b\n"
+               ".long 16b,90b\n"
+               ".long 17b,90b\n"
+               ".long 18b,90b\n"
+               ".long 19b,90b\n"
+               ".long 20b,90b\n"
+               ".long 21b,90b\n"
                ".previous"
                : "=d" (sum), "=d" (len), "=a" (src), "=a" (dst),
                  "=&d" (tmp1), "=d" (tmp2)
                : "0" (sum), "1" (len), "2" (src), "3" (dst)
            );
 
-       return tmp2 ? 0 : sum;
+       return sum;
 }
 
 EXPORT_SYMBOL(csum_and_copy_from_user);