From: Eric W. Biederman <ebiederm@xmission.com>
Date: Sat, 15 Mar 2014 01:10:14 +0000 (-0700)
Subject: tc35815: Don't receive packets when the napi budget == 0
X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=176f792f571ffef6d86b4254424cc05bb3874c9e;p=deliverable%2Flinux.git

tc35815: 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/toshiba/tc35815.c b/drivers/net/ethernet/toshiba/tc35815.c
index 88e9c73cebc0..fef5573dbfca 100644
--- a/drivers/net/ethernet/toshiba/tc35815.c
+++ b/drivers/net/ethernet/toshiba/tc35815.c
@@ -1645,6 +1645,9 @@ static int tc35815_poll(struct napi_struct *napi, int budget)
 	int received = 0, handled;
 	u32 status;
 
+	if (budget <= 0)
+		return received;
+
 	spin_lock(&lp->rx_lock);
 	status = tc_readl(&tr->Int_Src);
 	do {