From: Jarek Poplawski <jarkao2@gmail.com>
Date: Tue, 16 Dec 2008 23:42:20 +0000 (-0800)
Subject: drivers/net: starfire: Fix napi ->poll() weight handling
X-Git-Tag: firefly_0821_release~16506^2~6
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=9a3de25544dadab1971847f28f33b1cd0d1770a6;p=firefly-linux-kernel-4.4.55.git

drivers/net: starfire: Fix napi ->poll() weight handling

starfire napi ->poll() handler can return work == weight after calling
netif_rx_complete() (if there is no more work). It is illegal and this
patch fixes it.

Reported-by: Alexander Huemer <alexander.huemer@sbg.ac.at>
Tested-by: Alexander Huemer <alexander.huemer@sbg.ac.at>
Signed-off-by: Jarek Poplawski <jarkao2@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/drivers/net/starfire.c b/drivers/net/starfire.c
index 1d2ef8f47780..5a40f2d78beb 100644
--- a/drivers/net/starfire.c
+++ b/drivers/net/starfire.c
@@ -1509,6 +1509,11 @@ static int __netdev_rx(struct net_device *dev, int *quota)
 		desc->status = 0;
 		np->rx_done = (np->rx_done + 1) % DONE_Q_SIZE;
 	}
+
+	if (*quota == 0) {	/* out of rx quota */
+		retcode = 1;
+		goto out;
+	}
 	writew(np->rx_done, np->base + CompletionQConsumerIdx);
 
  out: