md: stop using csum_partial for checksum calculation in md

If CONFIG_NET is not selected, csum_partial is not exported, so md.ko cannot
use it.  We shouldn't really be using csum_partial anyway as it is an
internal-to-networking interface.

So replace it with C code to do the same thing.  Speed is not crucial here, so
something simple and correct is best.

Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 29 insertions, 2 deletions

diff --git a/drivers/md/md.c b/drivers/md/md.c
index 64b35cbf3159..bad324171cad 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -590,14 +590,41 @@ abort:
         return ret;
 }
 
+
+static u32 md_csum_fold(u32 csum)
+{
+        csum = (csum & 0xffff) + (csum >> 16);
+        return (csum & 0xffff) + (csum >> 16);
+}
+
 static unsigned int calc_sb_csum(mdp_super_t * sb)
 {
+        u64 newcsum = 0;
+        u32 *sb32 = (u32*)sb;
+        int i;
         unsigned int disk_csum, csum;
 
         disk_csum = sb->sb_csum;
         sb->sb_csum = 0;
-        csum = csum_partial((void *)sb, MD_SB_BYTES, 0);
+
+        for (i = 0; i < MD_SB_BYTES/4 ; i++)
+                newcsum += sb32[i];
+        csum = (newcsum & 0xffffffff) + (newcsum>>32);
+
+
+#ifdef CONFIG_ALPHA
+        /* This used to use csum_partial, which was wrong for several
+         * reasons including that different results are returned on
+         * different architectures.  It isn't critical that we get exactly
+         * the same return value as before (we always csum_fold before
+         * testing, and that removes any differences).  However as we
+         * know that csum_partial always returned a 16bit value on
+         * alphas, do a fold to maximise conformity to previous behaviour.
+         */
+        sb->sb_csum = md_csum_fold(disk_csum);
+#else
         sb->sb_csum = disk_csum;
+#endif
         return csum;
 }
 
@@ -685,7 +712,7 @@ static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version
         if (sb->raid_disks <= 0)
                 goto abort;
 
-        if (csum_fold(calc_sb_csum(sb)) != csum_fold(sb->sb_csum)) {
+        if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) {
                 printk(KERN_WARNING "md: invalid superblock checksum on %s\n",
                         b);
                 goto abort;