From bffb184247bcc783a40a0e123a9a2de3c5b28157 Mon Sep 17 00:00:00 2001 From: "K. Y. Srinivasan" Date: Thu, 6 Apr 2017 14:59:21 -0700 Subject: [PATCH] netvsc: Initialize all channel related state prior to opening the channel Prior to opening the channel we should have all the state setup to handle interrupts. The current code does not do that; fix the bug. This bug can result in faults in the interrupt path. Signed-off-by: K. Y. Srinivasan Signed-off-by: David S. Miller --- drivers/net/hyperv/netvsc.c | 27 +++++++++++++++------------ drivers/net/hyperv/rndis_filter.c | 5 +++-- 2 files changed, 18 insertions(+), 14 deletions(-) diff --git a/drivers/net/hyperv/netvsc.c b/drivers/net/hyperv/netvsc.c index e998e2f..7ab06b3 100644 --- a/drivers/net/hyperv/netvsc.c +++ b/drivers/net/hyperv/netvsc.c @@ -1289,6 +1289,21 @@ int netvsc_device_add(struct hv_device *device, */ set_channel_read_mode(device->channel, HV_CALL_ISR); + /* If we're reopening the device we may have multiple queues, fill the + * chn_table with the default channel to use it before subchannels are + * opened. + * Initialize the channel state before we open; + * we can be interrupted as soon as we open the channel. + */ + + for (i = 0; i < VRSS_CHANNEL_MAX; i++) { + struct netvsc_channel *nvchan = &net_device->chan_table[i]; + + nvchan->channel = device->channel; + netif_napi_add(ndev, &nvchan->napi, + netvsc_poll, NAPI_POLL_WEIGHT); + } + /* Open the channel */ ret = vmbus_open(device->channel, ring_size * PAGE_SIZE, ring_size * PAGE_SIZE, NULL, 0, @@ -1303,18 +1318,6 @@ int netvsc_device_add(struct hv_device *device, /* Channel is opened */ netdev_dbg(ndev, "hv_netvsc channel opened successfully\n"); - /* If we're reopening the device we may have multiple queues, fill the - * chn_table with the default channel to use it before subchannels are - * opened. - */ - for (i = 0; i < VRSS_CHANNEL_MAX; i++) { - struct netvsc_channel *nvchan = &net_device->chan_table[i]; - - nvchan->channel = device->channel; - netif_napi_add(ndev, &nvchan->napi, - netvsc_poll, NAPI_POLL_WEIGHT); - } - /* Enable NAPI handler for init callbacks */ napi_enable(&net_device->chan_table[0].napi); diff --git a/drivers/net/hyperv/rndis_filter.c b/drivers/net/hyperv/rndis_filter.c index 98358252..1e9445b 100644 --- a/drivers/net/hyperv/rndis_filter.c +++ b/drivers/net/hyperv/rndis_filter.c @@ -1007,12 +1007,13 @@ static void netvsc_sc_open(struct vmbus_channel *new_sc) */ set_channel_read_mode(new_sc, HV_CALL_ISR); + /* Set the channel before opening.*/ + nvchan->channel = new_sc; + ret = vmbus_open(new_sc, nvscdev->ring_size * PAGE_SIZE, nvscdev->ring_size * PAGE_SIZE, NULL, 0, netvsc_channel_cb, nvchan); - if (ret == 0) - nvchan->channel = new_sc; napi_enable(&nvchan->napi); -- 2.7.4