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

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

[gregkh]

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

    Drivers: hv: util: Fcopy: 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-fcopy-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 20951c7535b5e6af46bc37b7142105f716df739c Mon Sep 17 00:00:00 2001
From: "K. Y. Srinivasan" <kys@microsoft.com>
Date: Thu, 22 Dec 2016 16:54:02 -0800
Subject: Drivers: hv: util: Fcopy: Fix a rescind processing issue

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

commit 20951c7535b5e6af46bc37b7142105f716df739c upstream.

Fcopy may use a char device to support the communication between
the user level daemon and the driver. When the Fcopy channel is rescinded
we need to make sure that the char device is fully cleaned up before
we can process a new Fcopy 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_fcopy.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/drivers/hv/hv_fcopy.c
+++ b/drivers/hv/hv_fcopy.c
@@ -61,6 +61,7 @@ static DECLARE_WORK(fcopy_send_work, fco
 static const char fcopy_devname[] = "vmbus/hv_fcopy";
 static u8 *recv_buffer;
 static struct hvutil_transport *hvt;
+static struct completion release_event;
 /*
  * This state maintains the version number registered by the daemon.
  */
@@ -317,6 +318,7 @@ static void fcopy_on_reset(void)
 
 	if (cancel_delayed_work_sync(&fcopy_timeout_work))
 		fcopy_respond_to_host(HV_E_FAIL);
+	complete(&release_event);
 }
 
 int hv_fcopy_init(struct hv_util_service *srv)
@@ -324,6 +326,7 @@ int hv_fcopy_init(struct hv_util_service
 	recv_buffer = srv->recv_buffer;
 	fcopy_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.
@@ -345,4 +348,5 @@ void hv_fcopy_deinit(void)
 	fcopy_transaction.state = HVUTIL_DEVICE_DYING;
 	cancel_delayed_work_sync(&fcopy_timeout_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