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netvsc: remove unnecessary lock on shutdown 

The channel inbound lock was not being used at all by the netvsc
device, but the spin_lock was helpful by providing necessary
barrier before waiting.

Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
stephen hemminger 2017-03-22 14:51:03 -07:00 committed by David S. Miller
parent 43c7bd1ffc
commit 00ecfb3b34
1 changed files with 3 additions and 4 deletions
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7
drivers/net/hyperv/rndis_filter.c
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@ -926,8 +926,6 @@ static void rndis_filter_halt_device(struct rndis_device *dev)
struct rndis_halt_request *halt; struct rndis_halt_request *halt;
struct net_device_context *net_device_ctx = netdev_priv(dev->ndev); struct net_device_context *net_device_ctx = netdev_priv(dev->ndev);
struct netvsc_device *nvdev = net_device_ctx->nvdev; struct netvsc_device *nvdev = net_device_ctx->nvdev;
struct hv_device *hdev = net_device_ctx->device_ctx;
ulong flags;
/* Attempt to do a rndis device halt */ /* Attempt to do a rndis device halt */
request = get_rndis_request(dev, RNDIS_MSG_HALT, request = get_rndis_request(dev, RNDIS_MSG_HALT,
@ -945,9 +943,10 @@ static void rndis_filter_halt_device(struct rndis_device *dev)
dev->state = RNDIS_DEV_UNINITIALIZED; dev->state = RNDIS_DEV_UNINITIALIZED;
cleanup: cleanup:
spin_lock_irqsave(&hdev->channel->inbound_lock, flags);
nvdev->destroy = true; nvdev->destroy = true;
spin_unlock_irqrestore(&hdev->channel->inbound_lock, flags);
/* Force flag to be ordered before waiting */
wmb();
/* Wait for all send completions */ /* Wait for all send completions */
wait_event(nvdev->wait_drain, netvsc_device_idle(nvdev)); wait_event(nvdev->wait_drain, netvsc_device_idle(nvdev));