hv_netvsc: Fix napi reschedule while receive completion is busy

[ Upstream commit 6b81b193b83e87da1ea13217d684b54fccf8ee8a ]

If out ring is full temporarily and receive completion cannot go out,
we may still need to reschedule napi if certain conditions are met.
Otherwise the napi poll might be stopped forever, and cause network
disconnect.

Fixes: 7426b1a51803 ("netvsc: optimize receive completions")
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/net/hyperv/netvsc.c b/drivers/net/hyperv/netvsc.c
index 701be5d81062431e9ad943ab1d314388a10f3e64..806239b89990d31820d54faa98d8e6e892e53437 100644 (file)
--- a/drivers/net/hyperv/netvsc.c
+++ b/drivers/net/hyperv/netvsc.c
@@ -1250,6 +1250,7 @@ int netvsc_poll(struct napi_struct *napi, int budget)
        struct hv_device *device = netvsc_channel_to_device(channel);
        struct net_device *ndev = hv_get_drvdata(device);
        int work_done = 0;
+       int ret;
 
        /* If starting a new interval */
        if (!nvchan->desc)
@@ -1261,16 +1262,18 @@ int netvsc_poll(struct napi_struct *napi, int budget)
                nvchan->desc = hv_pkt_iter_next(channel, nvchan->desc);
        }
 
-       /* If send of pending receive completions suceeded
-        *   and did not exhaust NAPI budget this time
-        *   and not doing busy poll
+       /* Send any pending receive completions */
+       ret = send_recv_completions(ndev, net_device, nvchan);
+
+       /* If it did not exhaust NAPI budget this time
+        *  and not doing busy poll
         * then re-enable host interrupts
-        *     and reschedule if ring is not empty.
+        *  and reschedule if ring is not empty
+        *   or sending receive completion failed.
         */
-       if (send_recv_completions(ndev, net_device, nvchan) == 0 &&
-           work_done < budget &&
+       if (work_done < budget &&
            napi_complete_done(napi, work_done) &&
-           hv_end_read(&channel->inbound) &&
+           (ret || hv_end_read(&channel->inbound)) &&
            napi_schedule_prep(napi)) {
                hv_begin_read(&channel->inbound);
                __napi_schedule(napi);