netdev - [PATCH net-next 2/2] 8139cp: Don't receive packets when the napi budget == 0

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Message-ID: <87vbvk777k.fsf_-_@xmission.com>
Date:	Tue, 11 Mar 2014 14:31:43 -0700
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	David Miller <davem@...emloft.net>
Cc:	eric.dumazet@...il.com, netdev@...r.kernel.org,
	xiyou.wangcong@...il.com, mpm@...enic.com, satyam.sharma@...il.com
Subject: [PATCH net-next 2/2] 8139cp: 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@...ssion.com
---
 drivers/net/ethernet/realtek/8139cp.c |    5 +----
 1 files changed, 1 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/realtek/8139cp.c b/drivers/net/ethernet/realtek/8139cp.c
index a3c1daa7ad5c..2bc728e65e24 100644
--- a/drivers/net/ethernet/realtek/8139cp.c
+++ b/drivers/net/ethernet/realtek/8139cp.c
@@ -476,7 +476,7 @@ rx_status_loop:
 	rx = 0;
 	cpw16(IntrStatus, cp_rx_intr_mask);
 
-	while (1) {
+	while (rx < budget) {
 		u32 status, len;
 		dma_addr_t mapping, new_mapping;
 		struct sk_buff *skb, *new_skb;
@@ -554,9 +554,6 @@ rx_next:
 		else
 			desc->opts1 = cpu_to_le32(DescOwn | cp->rx_buf_sz);
 		rx_tail = NEXT_RX(rx_tail);
-
-		if (rx >= budget)
-			break;
 	}
 
 	cp->rx_tail = rx_tail;
-- 
1.7.5.4

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