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authorCong Wang <xiyou.wangcong@gmail.com>2020-05-03 08:22:19 +0300
committerDavid S. Miller <davem@davemloft.net>2020-05-04 22:05:56 +0300
commit1a33e10e4a95cb109ff1145098175df3113313ef (patch)
treea903d8645954f9d50e03c3f0b8a25479ec2f6985 /drivers/net/hamradio
parentea84c842900872f5b8d6d4754cf0fa37d6672011 (diff)
downloadlinux-1a33e10e4a95cb109ff1145098175df3113313ef.tar.xz
net: partially revert dynamic lockdep key changes
This patch reverts the folowing commits: commit 064ff66e2bef84f1153087612032b5b9eab005bd "bonding: add missing netdev_update_lockdep_key()" commit 53d374979ef147ab51f5d632dfe20b14aebeccd0 "net: avoid updating qdisc_xmit_lock_key in netdev_update_lockdep_key()" commit 1f26c0d3d24125992ab0026b0dab16c08df947c7 "net: fix kernel-doc warning in <linux/netdevice.h>" commit ab92d68fc22f9afab480153bd82a20f6e2533769 "net: core: add generic lockdep keys" but keeps the addr_list_lock_key because we still lock addr_list_lock nestedly on stack devices, unlikely xmit_lock this is safe because we don't take addr_list_lock on any fast path. Reported-and-tested-by: syzbot+aaa6fa4949cc5d9b7b25@syzkaller.appspotmail.com Cc: Dmitry Vyukov <dvyukov@google.com> Cc: Taehee Yoo <ap420073@gmail.com> Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com> Acked-by: Taehee Yoo <ap420073@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/hamradio')
-rw-r--r--drivers/net/hamradio/bpqether.c20
1 files changed, 20 insertions, 0 deletions
diff --git a/drivers/net/hamradio/bpqether.c b/drivers/net/hamradio/bpqether.c
index fbea6f232819..206688154fdf 100644
--- a/drivers/net/hamradio/bpqether.c
+++ b/drivers/net/hamradio/bpqether.c
@@ -107,6 +107,25 @@ struct bpqdev {
static LIST_HEAD(bpq_devices);
+/*
+ * bpqether network devices are paired with ethernet devices below them, so
+ * form a special "super class" of normal ethernet devices; split their locks
+ * off into a separate class since they always nest.
+ */
+static struct lock_class_key bpq_netdev_xmit_lock_key;
+
+static void bpq_set_lockdep_class_one(struct net_device *dev,
+ struct netdev_queue *txq,
+ void *_unused)
+{
+ lockdep_set_class(&txq->_xmit_lock, &bpq_netdev_xmit_lock_key);
+}
+
+static void bpq_set_lockdep_class(struct net_device *dev)
+{
+ netdev_for_each_tx_queue(dev, bpq_set_lockdep_class_one, NULL);
+}
+
/* ------------------------------------------------------------------------ */
@@ -477,6 +496,7 @@ static int bpq_new_device(struct net_device *edev)
err = register_netdevice(ndev);
if (err)
goto error;
+ bpq_set_lockdep_class(ndev);
/* List protected by RTNL */
list_add_rcu(&bpq->bpq_list, &bpq_devices);