kernel: Update 4.12.x to latest VMBus/Hyper-V socket patches

Notie, the instructions added in: https://github.com/Microsoft/opengcs/pull/147
add a commit to revert another patch in this series. Instead of applying
c15d7f606f8 ("Revert "vmbus: destroy a hv_sock device only after the RESCIND_OFFER
is received"") we simply drop the orginal commit e37da6e7a52ea6 ("vmbus: destroy a
hv_sock device only after the RESCIND_OFFER is received") from our list.

Signed-off-by: Rolf Neugebauer <rolf.neugebauer@docker.com>

kernel/patches-4.12.x/0016-vmbus-destroy-a-hv_sock-device-only-after-the-RESCIN.patch

@@ -1,49 +0,0 @@
-From 9c999c9259ee29bbd2ed49c81465ea460ff4ea3a Mon Sep 17 00:00:00 2001
-From: Dexuan Cui <decui@microsoft.com>
-Date: Tue, 29 Aug 2017 14:23:39 -0700
-Subject: [PATCH 16/18] vmbus: destroy a hv_sock device only after the
- RESCIND_OFFER is received
-
-It looks the host/guest interactive protocol for hv_sock has been changed
-since Windows Server TP5, and now Linux VM should only destroy the channel
-after the host agrees: the host always sends a RESCIND_OFFER message to the
-VM for this).
-
-Without the patch, the host's recv() can return -1 when Linux closes a
-hv_sock connection, and as a result, the host app can potentially lose the
-last portion of the data transferred through the hv_sock connection.
-
-Signed-off-by: Dexuan Cui <decui@microsoft.com>
-Origin: git@github.com:dcui/linux.git
-(cherry picked from commit d6f7158fdbac10f9935a506451e3d54d2d50a7c7)
----
- drivers/hv/channel_mgmt.c | 6 +++---
- 1 file changed, 3 insertions(+), 3 deletions(-)
-
-diff --git a/drivers/hv/channel_mgmt.c b/drivers/hv/channel_mgmt.c
-index a12b1eabc15e..83d4292e4351 100644
---- a/drivers/hv/channel_mgmt.c
-+++ b/drivers/hv/channel_mgmt.c
-@@ -905,6 +905,9 @@ static void vmbus_onoffer_rescind(struct vmbus_channel_message_header *hdr)
- 	if (channel->device_obj) {
- 		if (channel->chn_rescind_callback) {
- 			channel->chn_rescind_callback(channel);
-+
-+			vmbus_device_unregister(channel->device_obj);
-+
- 			return;
- 		}
- 		/*
-@@ -955,9 +958,6 @@ void vmbus_hvsock_device_unregister(struct vmbus_channel *channel)
- 		      vmbus_connection.work_queue_rescind, &work);
- 	flush_work(&work);
- 
--	channel->rescind = true;
--	vmbus_device_unregister(channel->device_obj);
--
- 	/* Unblock the rescind handling */
- 	atomic_dec(&vmbus_connection.offer_in_progress);
- }
--- 
-2.14.1
-

kernel/patches-4.12.x/0016-vmbus-hvsock-add-proper-sync-for-vmbus_hvsock_device.patch

@@ -0,0 +1,86 @@
+From 5dc143f0f2a3cc5f4d9f2d3a9b89e190dcdb7230 Mon Sep 17 00:00:00 2001
+From: Dexuan Cui <decui@microsoft.com>
+Date: Tue, 19 Sep 2017 20:05:31 -0700
+Subject: [PATCH 16/18] vmbus: hvsock: add proper sync for
+ vmbus_hvsock_device_unregister()
+
+Without the patch, vmbus_hvsock_device_unregister() can destroy the device
+prematurely.
+
+Signed-off-by: Dexuan Cui <decui@microsoft.com>
+Origin: git@github.com:dcui/linux.git
+(cherry picked from commit b6ffb4393fb266711b37ed056487665d8650f31a)
+---
+ drivers/hv/channel_mgmt.c | 20 ++++++--------------
+ include/linux/hyperv.h    |  2 ++
+ 2 files changed, 8 insertions(+), 14 deletions(-)
+
+diff --git a/drivers/hv/channel_mgmt.c b/drivers/hv/channel_mgmt.c
+index a12b1eabc15e..1c20d6afae59 100644
+--- a/drivers/hv/channel_mgmt.c
++++ b/drivers/hv/channel_mgmt.c
+@@ -559,6 +559,8 @@ static void vmbus_process_offer(struct vmbus_channel *newchannel)
+ 	newchannel->device_obj = device_obj;
+ 	atomic_dec(&vmbus_connection.register_in_progress);
+ 
++	newchannel->probe_done = true;
++
+ 	return;
+ 
+ err_deq_chan:
+@@ -905,6 +907,8 @@ static void vmbus_onoffer_rescind(struct vmbus_channel_message_header *hdr)
+ 	if (channel->device_obj) {
+ 		if (channel->chn_rescind_callback) {
+ 			channel->chn_rescind_callback(channel);
++			channel->rescind_done = true;
++
+ 			return;
+ 		}
+ 		/*
+@@ -938,28 +942,16 @@ static void vmbus_onoffer_rescind(struct vmbus_channel_message_header *hdr)
+ 	}
+ }
+ 
+-static void vmbus_stop_rescind_handling_work(struct work_struct *work)
+-{
+-	atomic_inc(&vmbus_connection.offer_in_progress);
+-}
+-
+ void vmbus_hvsock_device_unregister(struct vmbus_channel *channel)
+ {
+ 	struct work_struct work;
+ 
+ 	BUG_ON(!is_hvsock_channel(channel));
+ 
+-	/* Prevent chn_rescind_callback from running in the rescind path */
+-	INIT_WORK(&work, vmbus_stop_rescind_handling_work);
+-	queue_work_on(vmbus_connection.connect_cpu,
+-		      vmbus_connection.work_queue_rescind, &work);
+-	flush_work(&work);
++	while (!READ_ONCE(channel->probe_done) || !READ_ONCE(channel->rescind_done))
++		msleep(1);
+ 
+-	channel->rescind = true;
+ 	vmbus_device_unregister(channel->device_obj);
+-
+-	/* Unblock the rescind handling */
+-	atomic_dec(&vmbus_connection.offer_in_progress);
+ }
+ EXPORT_SYMBOL_GPL(vmbus_hvsock_device_unregister);
+ 
+diff --git a/include/linux/hyperv.h b/include/linux/hyperv.h
+index 511d47e3ee9d..5676f2a16531 100644
+--- a/include/linux/hyperv.h
++++ b/include/linux/hyperv.h
+@@ -896,6 +896,8 @@ struct vmbus_channel {
+ 	 */
+ 	enum hv_numa_policy affinity_policy;
+ 
++	bool probe_done;
++	bool rescind_done;
+ };
+ 
+ static inline bool is_hvsock_channel(const struct vmbus_channel *c)
+-- 
+2.14.1
+

kernel/patches-4.12.x/0017-ext4-fix-fault-handling-when-mounted-with-o-dax-ro.patch

@@ -1,4 +1,4 @@
-From 40e4b5cacba06f888591fe81faac1dd4b3b4413c Mon Sep 17 00:00:00 2001
+From 33f5b46c4e0e21b17a41dcfd181c95d9997b4436 Mon Sep 17 00:00:00 2001
 From: Randy Dodgen <dodgen@google.com>
 Date: Thu, 24 Aug 2017 15:26:01 -0400
 Subject: [PATCH 17/18] ext4: fix fault handling when mounted with -o dax,ro

kernel/patches-4.12.x/0018-NVDIMM-reducded-ND_MIN_NAMESPACE_SIZE-from-4MB-to-4K.patch

@@ -1,4 +1,4 @@
-From e4e680592a9006069ae93b8d11b281d652152995 Mon Sep 17 00:00:00 2001
+From 00c4be87968d1009795872f1fed2f854deabbeff Mon Sep 17 00:00:00 2001
 From: Cheng-mean Liu <soccerl@microsoft.com>
 Date: Tue, 11 Jul 2017 16:58:26 -0700
 Subject: [PATCH 18/18] NVDIMM: reducded ND_MIN_NAMESPACE_SIZE from 4MB to 4KB