hv_netvsc: fix race in napi poll when rescheduling
[ Commit d64e38ae69
upstream. ]
There is a race between napi_reschedule and re-enabling interrupts
which could lead to missed host interrrupts. This occurs when
interrupts are re-enabled (hv_end_read) and vmbus irq callback
(netvsc_channel_cb) has already scheduled NAPI.
Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -1205,9 +1205,10 @@ int netvsc_poll(struct napi_struct *napi, int budget)
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if (send_recv_completions(ndev, net_device, nvchan) == 0 &&
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work_done < budget &&
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napi_complete_done(napi, work_done) &&
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hv_end_read(&channel->inbound)) {
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hv_end_read(&channel->inbound) &&
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napi_schedule_prep(napi)) {
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hv_begin_read(&channel->inbound);
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napi_reschedule(napi);
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__napi_schedule(napi);
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}
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/* Driver may overshoot since multiple packets per descriptor */
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