Patch "x86/platform/uv/BAU: Fix HUB errors by remove initial write to sw-ack register" has been added to the 4.9-stable tree

This is a note to let you know that I've just added the patch titled

x86/platform/uv/BAU: Fix HUB errors by remove initial write to sw-ack register

to the 4.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
x86-platform-uv-bau-fix-hub-errors-by-remove-initial-write-to-sw-ack-register.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Andrew Banman <[email protected]>
Date: Fri, 17 Feb 2017 11:07:49 -0600
Subject: x86/platform/uv/BAU: Fix HUB errors by remove initial write to sw-ack register

From: Andrew Banman <[email protected]>

[ 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.

---
 arch/x86/platform/uv/tlb_uv.c |    1 -
 1 file changed, 1 deletion(-)

@@ -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);

Patches currently in stable-queue which might be from [email protected] are

queue-4.9/x86-platform-uv-bau-fix-hub-errors-by-remove-initial-write-to-sw-ack-register.patch