From ae5de0ff0bc24664a053109c6caa782ba2ad7c53 Mon Sep 17 00:00:00 2001
From: "David S. Miller" <davem@sunset.davemloft.net>
Date: Sun, 4 Jun 2006 21:32:01 -0700
Subject: [SPARC64]: Fix missing fold at end of checksums.

Both csum_partial() and the csum_partial_copy*() family of routines
forget to do a final fold on the computed checksum value on sparc64.
So do the standard Sparc "add + set condition codes, add carry"
sequence, then make sure the high 32-bits of the return value are
clear.

Based upon some excellent detective work and debugging done by
Richard Braun and Samuel Thibault.

Signed-off-by: David S. Miller <davem@davemloft.net>
---
 arch/sparc64/lib/checksum.S  | 5 +++--
 arch/sparc64/lib/csum_copy.S | 5 +++--
 2 files changed, 6 insertions(+), 4 deletions(-)

(limited to 'arch/sparc64/lib')

diff --git a/arch/sparc64/lib/checksum.S b/arch/sparc64/lib/checksum.S
index ba9cd3ccc2b2..1d230f693dc4 100644
--- a/arch/sparc64/lib/checksum.S
+++ b/arch/sparc64/lib/checksum.S
@@ -165,8 +165,9 @@ csum_partial_end_cruft:
 	sll		%g1, 8, %g1
 	or		%o5, %g1, %o4
 
-1:	add		%o2, %o4, %o2
+1:	addcc		%o2, %o4, %o2
+	addc		%g0, %o2, %o2
 
 csum_partial_finish:
 	retl
-	 mov		%o2, %o0
+	 srl		%o2, 0, %o0
diff --git a/arch/sparc64/lib/csum_copy.S b/arch/sparc64/lib/csum_copy.S
index 71af48839064..e566c770a0f6 100644
--- a/arch/sparc64/lib/csum_copy.S
+++ b/arch/sparc64/lib/csum_copy.S
@@ -221,11 +221,12 @@ FUNC_NAME:		/* %o0=src, %o1=dst, %o2=len, %o3=sum */
 	sll		%g1, 8, %g1
 	or		%o5, %g1, %o4
 
-1:	add		%o3, %o4, %o3
+1:	addcc		%o3, %o4, %o3
+	addc		%g0, %o3, %o3
 
 70:
 	retl
-	 mov		%o3, %o0
+	 srl		%o3, 0, %o0
 
 95:	mov		0, GLOBAL_SPARE
 	brlez,pn	%o2, 4f
-- 
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