From: Andrew Banman Date: Fri, 17 Feb 2017 17:07:49 +0000 (-0600) Subject: x86/platform/uv/BAU: Fix HUB errors by remove initial write to sw-ack register X-Git-Tag: archive/raspbian/4.9.80-2+rpi1~7^2~856 X-Git-Url: https://dgit.raspbian.org/?a=commitdiff_plain;h=29dc610cfc7c2df653c25b798513ed9cc9b16e4b;p=linux-4.9.git x86/platform/uv/BAU: Fix HUB errors by remove initial write to sw-ack register [ Upstream commit 1b17c6df852851b40c3c27c66b8fa2fd99cf25d8 ] Writing to the software acknowledge clear register when there are no pending messages causes a HUB error to assert. The original intent of this write was to clear the pending bits before start of operation, but this is an incorrect method and has been determined to be unnecessary. Signed-off-by: Andrew Banman Acked-by: Mike Travis Cc: Andy Lutomirski Cc: Borislav Petkov Cc: Brian Gerst Cc: Denys Vlasenko Cc: H. Peter Anvin Cc: Josh Poimboeuf Cc: Linus Torvalds Cc: Peter Zijlstra Cc: Thomas Gleixner Cc: akpm@linux-foundation.org Cc: rja@hpe.com Cc: sivanich@hpe.com Link: http://lkml.kernel.org/r/1487351269-181133-1-git-send-email-abanman@hpe.com Signed-off-by: Ingo Molnar Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman --- diff --git a/arch/x86/platform/uv/tlb_uv.c b/arch/x86/platform/uv/tlb_uv.c index 9e42842e924a..0f0175186f1b 100644 --- a/arch/x86/platform/uv/tlb_uv.c +++ b/arch/x86/platform/uv/tlb_uv.c @@ -1848,7 +1848,6 @@ static void pq_init(int node, int pnode) ops.write_payload_first(pnode, first); ops.write_payload_last(pnode, last); - ops.write_g_sw_ack(pnode, 0xffffUL); /* in effect, all msg_type's are set to MSG_NOOP */ memset(pqp, 0, sizeof(struct bau_pq_entry) * DEST_Q_SIZE);