linux-kernel - [PATCH 3.12 079/122] netxen: fix netxen_nic

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Message-Id: <795c55d8ad906db83c2997fe16bd2e319fa4df01.1424099974.git.jslaby@suse.cz>
Date:	Tue, 17 Feb 2015 12:34:26 +0100
From:	Jiri Slaby <jslaby@...e.cz>
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, Eric Dumazet <edumazet@...gle.com>,
	Manish Chopra <manish.chopra@...gic.com>,
	"David S. Miller" <davem@...emloft.net>,
	Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 079/122] netxen: fix netxen_nic_poll() logic

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

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

===============

[ 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: Jiri Slaby <jslaby@...e.cz>
---
 drivers/net/ethernet/qlogic/netxen/netxen_nic_main.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/qlogic/netxen/netxen_nic_main.c b/drivers/net/ethernet/qlogic/netxen/netxen_nic_main.c
index cbd75f97ffb3..03707c1edc2a 100644
--- a/drivers/net/ethernet/qlogic/netxen/netxen_nic_main.c
+++ b/drivers/net/ethernet/qlogic/netxen/netxen_nic_main.c
@@ -2366,7 +2366,10 @@ static int netxen_nic_poll(struct napi_struct *napi, int budget)
 
 	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);
-- 
2.2.2

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