From: Frank Blaschka <frank.blaschka@de.ibm.com>
Date: Mon, 8 Nov 2010 03:03:49 +0000 (+0000)
Subject: qeth: fix race condition during device startup
X-Git-Url: https://bbs.cooldavid.org/git/?a=commitdiff_plain;h=0cffef48ebf5060f749d8b04ab0437a4ba009e77;p=net-next-2.6.git

qeth: fix race condition during device startup

QDIO is running independent from netdevice state. We are not
allowed to schedule NAPI in case the netdevice is not open.

Signed-off-by: Frank Blaschka <frank.blaschka@de.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/drivers/s390/net/qeth_core_main.c b/drivers/s390/net/qeth_core_main.c
index 09ab6a2d3e4..e6b2df0e73f 100644
--- a/drivers/s390/net/qeth_core_main.c
+++ b/drivers/s390/net/qeth_core_main.c
@@ -2903,7 +2903,7 @@ void qeth_qdio_start_poll(struct ccw_device *ccwdev, int queue,
 {
 	struct qeth_card *card = (struct qeth_card *)card_ptr;
 
-	if (card->dev)
+	if (card->dev && (card->dev->flags & IFF_UP))
 		napi_schedule(&card->napi);
 }
 EXPORT_SYMBOL_GPL(qeth_qdio_start_poll);