Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit e38e2af1 authored by Cliff Wickman's avatar Cliff Wickman Committed by Ingo Molnar
Browse files

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: default avatarCliff Wickman <cpw@sgi.com>
Cc: <stable@kernel.org>
LKML-Reference: <E1NBGB9-0005nU-Dp@eag09.americas.sgi.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent d9c2d5ac

arch/x86/kernel/tlb_uv.c

+1 −3
Original line number Diff line number Diff line
@@ -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,

				      ((apicid << 32) | UV_BAU_MESSAGE));

	}

	return 0;

}