From: Sowmini Varadhan <sowmini.varadhan@oracle.com>
Date: Thu, 6 Nov 2014 19:51:08 +0000 (-0500)
Subject: sunvnet: Return from vnet_napi_event() if no packets to read
X-Git-Tag: omap-for-v3.19/fixes-rc1~125^2~253^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8c4ee3e70646d6bfdda55afe84016b914c7fdd0e;p=pandora-kernel.git

sunvnet: Return from vnet_napi_event() if no packets to read

vnet_event_napi() may be called as part of the NAPI ->poll,
to resume reading descriptor rings. When no data is available,
descriptor ring state (e.g., rcv_nxt) needs to be reset
carefully to stay in lock-step with ldc_read(). In the interest
of simplicity, the best way to do this is to return from
vnet_event_napi() when there are no more packets to read.
The next trip through ldc_rx will correctly set up the dring state.

Signed-off-by: Sowmini Varadhan <sowmini.varadhan@oracle.com>
Tested-by: David Stevens <david.stevens@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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