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authorK. Y. Srinivasan <kys@microsoft.com>2016-12-22 16:54:01 -0800
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-03-12 06:37:29 +0100
commitabaeda7f709ac1e518c9dc197efd4abfdcd46942 (patch)
treefc1530bce22f34e75028bb86b24e665c57d9a4ea
parent862d2b7d21d383d1b043bda57db38a7e3520f42e (diff)
downloadlinux-linaro-stable-abaeda7f709ac1e518c9dc197efd4abfdcd46942.tar.gz
Drivers: hv: util: kvp: Fix a rescind processing issue
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 When the KVP channel is rescinded we need to make sure that the char device is fully cleaned up before we can process a new KVP offer from the host.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>
-rw-r--r--drivers/hv/hv_kvp.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/hv/hv_kvp.c b/drivers/hv/hv_kvp.c
index 2a3420c4ca59..ce4d3a935491 100644
--- a/drivers/hv/hv_kvp.c
+++ b/drivers/hv/hv_kvp.c
@@ -86,6 +86,7 @@ static DECLARE_WORK(kvp_sendkey_work, kvp_send_key);
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.
@@ -682,6 +683,7 @@ 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
@@ -689,6 +691,7 @@ hv_kvp_init(struct hv_util_service *srv)
{
recv_buffer = srv->recv_buffer;
+ init_completion(&release_event);
/*
* When this driver loads, the user level daemon that
* processes the host requests may not yet be running.
@@ -711,4 +714,5 @@ 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);
}