linux-kernel - [PATCH 3.16 267/305] qeth: delete napi struct when removing a qeth device

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Message-ID: <lsq.1471110171.240101173@decadent.org.uk>
Date:	Sat, 13 Aug 2016 18:42:51 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org, "Alexander Klein" <ALKL@...ibm.com>,
	"David S. Miller" <davem@...emloft.net>,
	"Ursula Braun" <ubraun@...ux.vnet.ibm.com>
Subject: [PATCH 3.16 267/305] qeth: delete napi struct when removing a
 qeth device

3.16.37-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Ursula Braun <ubraun@...ux.vnet.ibm.com>

commit 7831b4ff0d926e0deeaabef9db8800ed069a2757 upstream.

A qeth_card contains a napi_struct linked to the net_device during
device probing. This struct must be deleted when removing the qeth
device, otherwise Panic on oops can occur when qeth devices are
repeatedly removed and added.

Fixes: a1c3ed4c9ca ("qeth: NAPI support for l2 and l3 discipline")
Signed-off-by: Ursula Braun <ubraun@...ux.vnet.ibm.com>
Tested-by: Alexander Klein <ALKL@...ibm.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/s390/net/qeth_l2_main.c | 1 +
 drivers/s390/net/qeth_l3_main.c | 1 +
 2 files changed, 2 insertions(+)

--- a/drivers/s390/net/qeth_l2_main.c
+++ b/drivers/s390/net/qeth_l2_main.c
@@ -911,6 +911,7 @@ static void qeth_l2_remove_device(struct
 		qeth_l2_set_offline(cgdev);
 
 	if (card->dev) {
+		netif_napi_del(&card->napi);
 		unregister_netdev(card->dev);
 		card->dev = NULL;
 	}
--- a/drivers/s390/net/qeth_l3_main.c
+++ b/drivers/s390/net/qeth_l3_main.c
@@ -3337,6 +3337,7 @@ static void qeth_l3_remove_device(struct
 		qeth_l3_set_offline(cgdev);
 
 	if (card->dev) {
+		netif_napi_del(&card->napi);
 		unregister_netdev(card->dev);
 		card->dev = NULL;
 	}