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netvsc: avoid race with callback 

Change the argument to channel callback from the channel pointer
to the internal data structure containing per-channel info.
This avoids any possible races when callback happens during
initialization and makes IRQ code simpler.

Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
stephen hemminger 2017-03-16 16:12:37 -07:00 committed by David S. Miller
parent 3a70418b9c
commit 6de38af611
2 changed files with 15 additions and 18 deletions
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18
drivers/net/hyperv/netvsc.c
View File

@ -1250,21 +1250,12 @@ int netvsc_poll(struct napi_struct *napi, int budget)
void netvsc_channel_cb(void *context)
{
struct vmbus_channel *channel = context;
struct hv_device *device = netvsc_channel_to_device(channel);
u16 q_idx = channel->offermsg.offer.sub_channel_index;
struct netvsc_device *net_device;
struct net_device *ndev;
ndev = hv_get_drvdata(device);
if (unlikely(!ndev))
return;
struct netvsc_channel *nvchan = context;
/* disable interupts from host */
hv_begin_read(&channel->inbound);
hv_begin_read(&nvchan->channel->inbound);
net_device = net_device_to_netvsc_device(ndev);
napi_schedule(&net_device->chan_table[q_idx].napi);
napi_schedule(&nvchan->napi);
}
/*
@ -1294,7 +1285,8 @@ int netvsc_device_add(struct hv_device *device,
/* Open the channel */
ret = vmbus_open(device->channel, ring_size * PAGE_SIZE,
ring_size * PAGE_SIZE, NULL, 0,
netvsc_channel_cb, device->channel);
netvsc_channel_cb,
net_device->chan_table);
if (ret != 0) {
netdev_err(ndev, "unable to open channel: %d\n", ret);

15
drivers/net/hyperv/rndis_filter.c
View File

@ -996,23 +996,28 @@ static void netvsc_sc_open(struct vmbus_channel *new_sc)
hv_get_drvdata(new_sc->primary_channel->device_obj);
struct netvsc_device *nvscdev = net_device_to_netvsc_device(ndev);
u16 chn_index = new_sc->offermsg.offer.sub_channel_index;
int ret;
struct netvsc_channel *nvchan;
unsigned long flags;
int ret;
if (chn_index >= nvscdev->num_chn)
return;
nvscdev->chan_table[chn_index].mrc.buf
nvchan = nvscdev->chan_table + chn_index;
nvchan->mrc.buf
= vzalloc(NETVSC_RECVSLOT_MAX * sizeof(struct recv_comp_data));
if (!nvchan->mrc.buf)
return;
ret = vmbus_open(new_sc, nvscdev->ring_size * PAGE_SIZE,
nvscdev->ring_size * PAGE_SIZE, NULL, 0,
netvsc_channel_cb, new_sc);
netvsc_channel_cb, nvchan);
if (ret == 0)
nvscdev->chan_table[chn_index].channel = new_sc;
nvchan->channel = new_sc;
napi_enable(&nvscdev->chan_table[chn_index].napi);
napi_enable(&nvchan->napi);
spin_lock_irqsave(&nvscdev->sc_lock, flags);
nvscdev->num_sc_offered--;