Drivers: hv: kvp,vss: Fast propagation of userspace communication failure

[firefly-linux-kernel-4.4.55.git] / drivers / hv / hv_snapshot.c

diff --git a/drivers/hv/hv_snapshot.c b/drivers/hv/hv_snapshot.c
index 21e51be74e6c4a15a915796ab38d368170bdf5f6..9d5e0d1efdb51bd235f87bcdd914d2c5656d6d45 100644 (file)
--- a/drivers/hv/hv_snapshot.c
+++ b/drivers/hv/hv_snapshot.c
@@ -96,6 +96,7 @@ vss_cn_callback(struct cn_msg *msg, struct netlink_skb_parms *nsp)
 static void vss_send_op(struct work_struct *dummy)
 {
        int op = vss_transaction.msg->vss_hdr.operation;
+       int rc;
        struct cn_msg *msg;
        struct hv_vss_msg *vss_msg;
 
@@ -111,7 +112,12 @@ static void vss_send_op(struct work_struct *dummy)
        vss_msg->vss_hdr.operation = op;
        msg->len = sizeof(struct hv_vss_msg);
 
-       cn_netlink_send(msg, 0, 0, GFP_ATOMIC);
+       rc = cn_netlink_send(msg, 0, 0, GFP_ATOMIC);
+       if (rc) {
+               pr_warn("VSS: failed to communicate to the daemon: %d\n", rc);
+               if (cancel_delayed_work_sync(&vss_timeout_work))
+                       vss_respond_to_host(HV_E_FAIL);
+       }
        kfree(msg);
 
        return;