From 8c4ee3e70646d6bfdda55afe84016b914c7fdd0e Mon Sep 17 00:00:00 2001 From: Sowmini Varadhan Date: Thu, 6 Nov 2014 14:51:08 -0500 Subject: [PATCH] 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 Tested-by: David Stevens Signed-off-by: David S. Miller --- drivers/net/ethernet/sun/sunvnet.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/drivers/net/ethernet/sun/sunvnet.c b/drivers/net/ethernet/sun/sunvnet.c index 2688b19a6e63..5c5fb59adf76 100644 --- a/drivers/net/ethernet/sun/sunvnet.c +++ b/drivers/net/ethernet/sun/sunvnet.c @@ -691,7 +691,6 @@ ldc_ctrl: pkt->end_idx = -1; goto napi_resume; } -ldc_read: err = ldc_read(vio->lp, &msgbuf, sizeof(msgbuf)); if (unlikely(err < 0)) { if (err == -ECONNRESET) @@ -722,8 +721,8 @@ napi_resume: err = vnet_rx(port, &msgbuf, &npkts, budget); if (npkts >= budget) break; - if (npkts == 0 && err != -ECONNRESET) - goto ldc_read; + if (npkts == 0) + break; } else if (msgbuf.tag.stype == VIO_SUBTYPE_ACK) { err = vnet_ack(port, &msgbuf); if (err > 0) -- 2.20.1