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

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

diff --git a/drivers/hv/hv_kvp.c b/drivers/hv/hv_kvp.c
index 521c14625b3ae10515b8720e0e43f305816b2606..beb8105c0e7bace32769198fd9f253c59d2fa543 100644 (file)
--- a/drivers/hv/hv_kvp.c
+++ b/drivers/hv/hv_kvp.c
@@ -350,6 +350,7 @@ kvp_send_key(struct work_struct *dummy)
        __u8 pool = kvp_transaction.kvp_msg->kvp_hdr.pool;
        __u32 val32;
        __u64 val64;
+       int rc;
 
        msg = kzalloc(sizeof(*msg) + sizeof(struct hv_kvp_msg) , GFP_ATOMIC);
        if (!msg)
@@ -446,7 +447,13 @@ kvp_send_key(struct work_struct *dummy)
        }
 
        msg->len = sizeof(struct hv_kvp_msg);
-       cn_netlink_send(msg, 0, 0, GFP_ATOMIC);
+       rc = cn_netlink_send(msg, 0, 0, GFP_ATOMIC);
+       if (rc) {
+               pr_debug("KVP: failed to communicate to the daemon: %d\n", rc);
+               if (cancel_delayed_work_sync(&kvp_work))
+                       kvp_respond_to_host(message, HV_E_FAIL);
+       }
+
        kfree(msg);
 
        return;