From: K. Y. Srinivasan Date: Fri, 23 Dec 2016 00:54:01 +0000 (-0800) Subject: Drivers: hv: util: kvp: Fix a rescind processing issue X-Git-Tag: firefly_0821_release~176^2^2^2~95 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=abaeda7f709ac1e518c9dc197efd4abfdcd46942;p=firefly-linux-kernel-4.4.55.git 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 When the KVP channel is rescinded we need to make sure that the char device is fully cleaned up before we can process a new KVP offer from the host.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 Signed-off-by: Greg Kroah-Hartman --- 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); }