Commit 5afe18d2 authored Sep 02, 2009 by Jiri Bohac Committed by Tony Luck Sep 02, 2009

[IA64] fix csum_ipv6_magic()

The 32-bit parameters (len and csum) of csum_ipv6_magic() are passed in 64-bit
registers in2 and in4. The high order 32 bits of the registers were never
cleared, and garbage was sometimes calculated into the checksum.

Fix this by clearing the high order 32 bits of these registers.

Signed-off-by: Jiri Bohac <jbohac@suse.cz>
Signed-off-by: Tony Luck <tony.luck@intel.com>

parent f2486f26

arch/ia64/lib/ip_fast_csum.S

+5 −3

Original line number	Diff line number	Diff line
		@@ -96,20 +96,22 @@ END(ip_fast_csum)
		GLOBAL_ENTRY(csum_ipv6_magic)
		ld4 r20=[in0],4
		ld4 r21=[in1],4
		dep r15=in3,in2,32,16
		zxt4 in2=in2
		;;
		ld4 r22=[in0],4
		ld4 r23=[in1],4
		mux1 r15=r15,@rev
		dep r15=in3,in2,32,16
		;;
		ld4 r24=[in0],4
		ld4 r25=[in1],4
		shr.u r15=r15,16
		mux1 r15=r15,@rev
		add r16=r20,r21
		add r17=r22,r23
		zxt4 in4=in4
		;;
		ld4 r26=[in0],4
		ld4 r27=[in1],4
		shr.u r15=r15,16
		add r18=r24,r25
		add r8=r16,r17
		;;