4.9-stable review patch. If anyone has any objections, please let me know.
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From: Andrew Banman abanman@hpe.com
[ 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 abanman@hpe.com Acked-by: Mike Travis mike.travis@hpe.com Cc: Andy Lutomirski luto@kernel.org Cc: Borislav Petkov bp@alien8.de Cc: Brian Gerst brgerst@gmail.com Cc: Denys Vlasenko dvlasenk@redhat.com Cc: H. Peter Anvin hpa@zytor.com Cc: Josh Poimboeuf jpoimboe@redhat.com Cc: Linus Torvalds torvalds@linux-foundation.org Cc: Peter Zijlstra peterz@infradead.org Cc: Thomas Gleixner tglx@linutronix.de 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 mingo@kernel.org Signed-off-by: Sasha Levin alexander.levin@verizon.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- arch/x86/platform/uv/tlb_uv.c | 1 - 1 file changed, 1 deletion(-)
--- 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);