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| author | Al Viro <viro@zeniv.linux.org.uk> | 2020-07-13 06:01:10 +0300 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2020-08-20 22:45:17 +0300 |
| commit | 66aa38801a5d1ea58b208d9d41374b9fac2088d3 (patch) | |
| tree | dcd3d381dd6decd3575cbcb901340bb5b565682a /arch/m68k/lib | |
| parent | 1d60be3c25edf4b9554fdb02aa6fb6fd75695aa7 (diff) | |
| download | linux-66aa38801a5d1ea58b208d9d41374b9fac2088d3.tar.xz | |
m68k: get rid of zeroing destination on error in csum_and_copy_from_user()
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'arch/m68k/lib')
| -rw-r--r-- | arch/m68k/lib/checksum.c | 79 |
1 files changed, 15 insertions, 64 deletions
diff --git a/arch/m68k/lib/checksum.c b/arch/m68k/lib/checksum.c index 3aeca261f622..7e6afeae6217 100644 --- 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); |