From: Cliff Wickman <cpw@sgi.com>
Date: Thu, 19 Nov 2009 23:12:43 +0000 (-0600)
Subject: x86: SGI UV: Fix BAU initialization
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=e38e2af1c57c3eb5211331a5b4fcaae0c4a2a918;p=GitHub%2Fexynos8895%2Fandroid_kernel_samsung_universal8895.git

x86: SGI UV: Fix BAU initialization

A memory mapped register that affects the SGI UV Broadcast
Assist Unit's interrupt handling may sometimes be unintialized.

Remove the condition on its initialization, as that condition
can be randomly satisfied by a hardware reset.

Signed-off-by: Cliff Wickman <cpw@sgi.com>
Cc: <stable@kernel.org>
LKML-Reference: <E1NBGB9-0005nU-Dp@eag09.americas.sgi.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---

diff --git a/arch/x86/kernel/tlb_uv.c b/arch/x86/kernel/tlb_uv.c
index 503c1f2e8835..af21e5556900 100644
--- a/arch/x86/kernel/tlb_uv.c
+++ b/arch/x86/kernel/tlb_uv.c
@@ -819,10 +819,8 @@ static int __init uv_init_blade(int blade)
 	 */
 	apicid = blade_to_first_apicid(blade);
 	pa = uv_read_global_mmr64(pnode, UVH_BAU_DATA_CONFIG);
-	if ((pa & 0xff) != UV_BAU_MESSAGE) {
-		uv_write_global_mmr64(pnode, UVH_BAU_DATA_CONFIG,
+	uv_write_global_mmr64(pnode, UVH_BAU_DATA_CONFIG,
 				      ((apicid << 32) | UV_BAU_MESSAGE));
-	}
 	return 0;
 }