linux-kernel - [PATCH 3.18 04/20] netxen: fix netxen_nic

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Message-Id: <20150225020854.277160774@linuxfoundation.org>
Date:	Tue, 24 Feb 2015 18:10:19 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Eric Dumazet <edumazet@...gle.com>,
	Manish Chopra <manish.chopra@...gic.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: [PATCH 3.18 04/20] netxen: fix netxen_nic_poll() logic

3.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Eric Dumazet <edumazet@...gle.com>

[ Upstream commit 6088beef3f7517717bd21d90b379714dd0837079 ]

NAPI poll logic now enforces that a poller returns exactly the budget
when it wants to be called again.

If a driver limits TX completion, it has to return budget as well when
the limit is hit, not the number of received packets.

Reported-and-tested-by: Mike Galbraith <umgwanakikbuti@...il.com>
Signed-off-by: Eric Dumazet <edumazet@...gle.com>
Fixes: d75b1ade567f ("net: less interrupt masking in NAPI")
Cc: Manish Chopra <manish.chopra@...gic.com>
Acked-by: Manish Chopra <manish.chopra@...gic.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/ethernet/qlogic/netxen/netxen_nic_main.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

--- a/drivers/net/ethernet/qlogic/netxen/netxen_nic_main.c
+++ b/drivers/net/ethernet/qlogic/netxen/netxen_nic_main.c
@@ -2388,7 +2388,10 @@ static int netxen_nic_poll(struct napi_s
 
 	work_done = netxen_process_rcv_ring(sds_ring, budget);
 
-	if ((work_done < budget) && tx_complete) {
+	if (!tx_complete)
+		work_done = budget;
+
+	if (work_done < budget) {
 		napi_complete(&sds_ring->napi);
 		if (test_bit(__NX_DEV_UP, &adapter->state))
 			netxen_nic_enable_int(sds_ring);


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