linux-kernel - [PATCH 3.10 146/180] qeth: delete napi struct when removing a qeth device

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Message-Id: <1471793510-13022-147-git-send-email-w@1wt.eu>
Date:   Sun, 21 Aug 2016 17:31:16 +0200
From:   Willy Tarreau <w@....eu>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Ursula Braun <ubraun@...ux.vnet.ibm.com>,
        stable@...r.kernel.org#v2.6.37+,
        "David S . Miller" <davem@...emloft.net>, Willy Tarreau <w@....eu>
Subject: [PATCH 3.10 146/180] qeth: delete napi struct when removing a qeth device

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")
Cc: stable@...r.kernel.org # v2.6.37+
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: Willy Tarreau <w@....eu>
---
 drivers/s390/net/qeth_l2_main.c | 1 +
 drivers/s390/net/qeth_l3_main.c | 1 +
 2 files changed, 2 insertions(+)

diff --git a/drivers/s390/net/qeth_l2_main.c b/drivers/s390/net/qeth_l2_main.c
index ec8ccda..0090de4 100644
--- a/drivers/s390/net/qeth_l2_main.c
+++ b/drivers/s390/net/qeth_l2_main.c
@@ -898,6 +898,7 @@ static void qeth_l2_remove_device(struct ccwgroup_device *cgdev)
 		qeth_l2_set_offline(cgdev);
 
 	if (card->dev) {
+		netif_napi_del(&card->napi);
 		unregister_netdev(card->dev);
 		card->dev = NULL;
 	}
diff --git a/drivers/s390/net/qeth_l3_main.c b/drivers/s390/net/qeth_l3_main.c
index c1b0b27..7366bef 100644
--- a/drivers/s390/net/qeth_l3_main.c
+++ b/drivers/s390/net/qeth_l3_main.c
@@ -3333,6 +3333,7 @@ static void qeth_l3_remove_device(struct ccwgroup_device *cgdev)
 		qeth_l3_set_offline(cgdev);
 
 	if (card->dev) {
+		netif_napi_del(&card->napi);
 		unregister_netdev(card->dev);
 		card->dev = NULL;
 	}
-- 
2.8.0.rc2.1.gbe9624a