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

commit 9a3de25544dadab1971847f28f33b1cd0d1770a6 upstream.

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>
Cc: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/net/starfire.c b/drivers/net/starfire.c
index 1d2ef8f47780904da79f621bf2ac09d284b50753..5a40f2d78beb1a9114478ac9e0385556c29d30bf 100644 (file)
--- 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: