Patch "Drivers: hv: util: kvp: Fix a rescind processing issue" has been added to the 4.10-stable tree

[<gregkh@linuxfoundation.org>]

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

    Drivers: hv: util: kvp: Fix a rescind processing issue

to the 4.10-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:
     drivers-hv-util-kvp-fix-a-rescind-processing-issue.patch
and it can be found in the queue-4.10 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 5a66fecbf6aa528e375cbebccb1061cc58d80c84 Mon Sep 17 00:00:00 2001
From: "K. Y. Srinivasan" <kys@microsoft.com>
Date: Thu, 22 Dec 2016 16:54:01 -0800
Subject: Drivers: hv: util: kvp: Fix a rescind processing issue

From: K. Y. Srinivasan <kys@microsoft.com>

commit 5a66fecbf6aa528e375cbebccb1061cc58d80c84 upstream.

KVP may use a char device to support the communication between
the user level daemon and the driver. When the KVP channel is rescinded
we need to make sure that the char device is fully cleaned up before
we can process a new KVP offer from the host. Implement this logic.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/hv/hv_kvp.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/drivers/hv/hv_kvp.c
+++ b/drivers/hv/hv_kvp.c
@@ -88,6 +88,7 @@ static DECLARE_WORK(kvp_sendkey_work, kv
 static const char kvp_devname[] = "vmbus/hv_kvp";
 static u8 *recv_buffer;
 static struct hvutil_transport *hvt;
+static struct completion release_event;
 /*
  * Register the kernel component with the user-level daemon.
  * As part of this registration, pass the LIC version number.
@@ -716,6 +717,7 @@ static void kvp_on_reset(void)
 	if (cancel_delayed_work_sync(&kvp_timeout_work))
 		kvp_respond_to_host(NULL, HV_E_FAIL);
 	kvp_transaction.state = HVUTIL_DEVICE_INIT;
+	complete(&release_event);
 }
 
 int
@@ -724,6 +726,7 @@ hv_kvp_init(struct hv_util_service *srv)
 	recv_buffer = srv->recv_buffer;
 	kvp_transaction.recv_channel = srv->channel;
 
+	init_completion(&release_event);
 	/*
 	 * When this driver loads, the user level daemon that
 	 * processes the host requests may not yet be running.
@@ -747,4 +750,5 @@ void hv_kvp_deinit(void)
 	cancel_delayed_work_sync(&kvp_timeout_work);
 	cancel_work_sync(&kvp_sendkey_work);
 	hvutil_transport_destroy(hvt);
+	wait_for_completion(&release_event);
 }


Patches currently in stable-queue which might be from kys@microsoft.com are

queue-4.10/hv-init-percpu_list-in-hv_synic_alloc.patch
queue-4.10/drivers-hv-vmbus-prevent-sending-data-on-a-rescinded-channel.patch
queue-4.10/drivers-hv-util-backup-fix-a-rescind-processing-issue.patch
queue-4.10/drivers-hv-util-fcopy-fix-a-rescind-processing-issue.patch
queue-4.10/pci-hv-fix-wslot_to_devfn-to-fix-warnings-on-device-removal.patch
queue-4.10/scsi-storvsc-use-tagged-srb-requests-if-supported-by-the-device.patch
queue-4.10/drivers-hv-vmbus-raise-retry-wait-limits-in-vmbus_post_msg.patch
queue-4.10/drivers-hv-util-kvp-fix-a-rescind-processing-issue.patch
queue-4.10/hv-allocate-synic-pages-for-all-present-cpus.patch
queue-4.10/hv-don-t-reset-hv_context.tsc_page-on-crash.patch
queue-4.10/scsi-storvsc-properly-set-residual-data-length-on-errors.patch
queue-4.10/scsi-storvsc-properly-handle-srb_error-when-sense-message-is-present.patch
queue-4.10/drivers-hv-vmbus-fix-a-rescind-handling-bug.patch