From 2be0f2644598ee4b8ea0ed6a32913e1ce0212c9c Mon Sep 17 00:00:00 2001 From: stephen hemminger Date: Wed, 3 May 2017 16:59:21 -0700 Subject: [PATCH] netvsc: make sure napi enabled before vmbus_open This fixes a race where vmbus callback for new packet arriving could occur before NAPI is initialized. Signed-off-by: Stephen Hemminger Signed-off-by: David S. Miller --- drivers/net/hyperv/netvsc.c | 8 +++++--- drivers/net/hyperv/rndis_filter.c | 2 +- 2 files changed, 6 insertions(+), 4 deletions(-) diff --git a/drivers/net/hyperv/netvsc.c b/drivers/net/hyperv/netvsc.c index 15749d359e60..652453d9fb08 100644 --- a/drivers/net/hyperv/netvsc.c +++ b/drivers/net/hyperv/netvsc.c @@ -1322,6 +1322,10 @@ int netvsc_device_add(struct hv_device *device, nvchan->channel = device->channel; } + /* Enable NAPI handler before init callbacks */ + netif_napi_add(ndev, &net_device->chan_table[0].napi, + netvsc_poll, NAPI_POLL_WEIGHT); + /* Open the channel */ ret = vmbus_open(device->channel, ring_size * PAGE_SIZE, ring_size * PAGE_SIZE, NULL, 0, @@ -1329,6 +1333,7 @@ int netvsc_device_add(struct hv_device *device, net_device->chan_table); if (ret != 0) { + netif_napi_del(&net_device->chan_table[0].napi); netdev_err(ndev, "unable to open channel: %d\n", ret); goto cleanup; } @@ -1336,9 +1341,6 @@ int netvsc_device_add(struct hv_device *device, /* Channel is opened */ netdev_dbg(ndev, "hv_netvsc channel opened successfully\n"); - /* Enable NAPI handler for init callbacks */ - netif_napi_add(ndev, &net_device->chan_table[0].napi, - netvsc_poll, NAPI_POLL_WEIGHT); napi_enable(&net_device->chan_table[0].napi); /* Writing nvdev pointer unlocks netvsc_send(), make sure chn_table is diff --git a/drivers/net/hyperv/rndis_filter.c b/drivers/net/hyperv/rndis_filter.c index ab92c3c95951..f9d5b0b8209a 100644 --- a/drivers/net/hyperv/rndis_filter.c +++ b/drivers/net/hyperv/rndis_filter.c @@ -1018,7 +1018,7 @@ static void netvsc_sc_open(struct vmbus_channel *new_sc) if (ret == 0) napi_enable(&nvchan->napi); else - netdev_err(ndev, "sub channel open failed (%d)\n", ret); + netif_napi_del(&nvchan->napi); if (refcount_dec_and_test(&nvscdev->sc_offered)) complete(&nvscdev->channel_init_wait); -- 2.20.1