From: Eric W. Biederman <ebiederm@xmission.com>
Date: Sat, 15 Mar 2014 01:11:22 +0000 (-0700)
Subject: sfc: Don't receive packets when the napi budget == 0
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=75363a4676cdb046242d06dca6e8a9c0a20d6c4a;p=openwrt%2Fstaging%2Fblogic.git

sfc: Don't receive packets when the napi budget == 0

Processing any incoming packets with a with a napi budget of 0
is incorrect driver behavior.

This matters as netpoll will shortly call drivers with a budget of 0
to avoid receive packet processing happening in hard irq context.

Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/drivers/net/ethernet/sfc/ef10.c b/drivers/net/ethernet/sfc/ef10.c
index eb75675f6e32..651626e133f9 100644
--- a/drivers/net/ethernet/sfc/ef10.c
+++ b/drivers/net/ethernet/sfc/ef10.c
@@ -1955,6 +1955,9 @@ static int efx_ef10_ev_process(struct efx_channel *channel, int quota)
 	int tx_descs = 0;
 	int spent = 0;
 
+	if (quota <= 0)
+		return spent;
+
 	read_ptr = channel->eventq_read_ptr;
 
 	for (;;) {
diff --git a/drivers/net/ethernet/sfc/farch.c b/drivers/net/ethernet/sfc/farch.c
index aa1b169f45ec..a08761360cdf 100644
--- a/drivers/net/ethernet/sfc/farch.c
+++ b/drivers/net/ethernet/sfc/farch.c
@@ -1248,6 +1248,9 @@ int efx_farch_ev_process(struct efx_channel *channel, int budget)
 	int tx_packets = 0;
 	int spent = 0;
 
+	if (budget <= 0)
+		return spent;
+
 	read_ptr = channel->eventq_read_ptr;
 
 	for (;;) {