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netvsc: don't signal host twice if empty 

When hv_pkt_iter_next() returns NULL, it has already called
hv_pkt_iter_close(). Calling it twice can lead to extra host signal.

Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
stephen hemminger 2017-08-09 17:46:04 -07:00 committed by David S. Miller
parent 6123c66854
commit 5e20d55a23
1 changed files with 0 additions and 4 deletions
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4
drivers/net/hyperv/netvsc.c
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@ -1191,10 +1191,6 @@ int netvsc_poll(struct napi_struct *napi, int budget)
nvchan->desc = hv_pkt_iter_next(channel, nvchan->desc); nvchan->desc = hv_pkt_iter_next(channel, nvchan->desc);
} }
/* if ring is empty, signal host */
if (!nvchan->desc)
hv_pkt_iter_close(channel);
/* If send of pending receive completions suceeded /* If send of pending receive completions suceeded
* and did not exhaust NAPI budget this time * and did not exhaust NAPI budget this time
* and not doing busy poll * and not doing busy poll