diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/hv/channel.c | 6 | ||||
| -rw-r--r-- | drivers/net/hyperv/netvsc.c | 7 |
2 files changed, 11 insertions, 2 deletions
diff --git a/drivers/hv/channel.c b/drivers/hv/channel.c index 23f358cb7f49..256ee90c7446 100644 --- a/drivers/hv/channel.c +++ b/drivers/hv/channel.c @@ -609,6 +609,12 @@ void vmbus_reset_channel_cb(struct vmbus_channel *channel) * the former is accessing channel->inbound.ring_buffer, the latter * could be freeing the ring_buffer pages, so here we must stop it * first. + * + * vmbus_chan_sched() might call the netvsc driver callback function + * that ends up scheduling NAPI work that accesses the ring buffer. + * At this point, we have to ensure that any such work is completed + * and that the channel ring buffer is no longer being accessed, cf. + * the calls to napi_disable() in netvsc_device_remove(). */ tasklet_disable(&channel->callback_event); diff --git a/drivers/net/hyperv/netvsc.c b/drivers/net/hyperv/netvsc.c index ca68aa1df801..41f5cf0bb997 100644 --- a/drivers/net/hyperv/netvsc.c +++ b/drivers/net/hyperv/netvsc.c @@ -636,9 +636,12 @@ void netvsc_device_remove(struct hv_device *device) RCU_INIT_POINTER(net_device_ctx->nvdev, NULL); - /* And disassociate NAPI context from device */ - for (i = 0; i < net_device->num_chn; i++) + /* Disable NAPI and disassociate its context from the device. */ + for (i = 0; i < net_device->num_chn; i++) { + /* See also vmbus_reset_channel_cb(). */ + napi_disable(&net_device->chan_table[i].napi); netif_napi_del(&net_device->chan_table[i].napi); + } /* * At this point, no one should be accessing net_device |