From 0378b59770130a994272b176a2a4346dc27361e9 Mon Sep 17 00:00:00 2001 From: Johan Hedberg Date: Wed, 19 Nov 2014 15:22:22 +0200 Subject: Bluetooth: Convert link keys list to use RCU This patch converts the hdev->link_keys list to be protected through RCU, thereby eliminating the need to hold the hdev lock while accessing the list. Signed-off-by: Johan Hedberg Signed-off-by: Marcel Holtmann --- net/bluetooth/hci_core.c | 37 ++++++++++++++++++------------------- 1 file changed, 18 insertions(+), 19 deletions(-) (limited to 'net/bluetooth/hci_core.c') diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c index a67a4b8e4e1c..5c319a49a5a4 100644 --- a/net/bluetooth/hci_core.c +++ b/net/bluetooth/hci_core.c @@ -274,15 +274,13 @@ static const struct file_operations inquiry_cache_fops = { static int link_keys_show(struct seq_file *f, void *ptr) { struct hci_dev *hdev = f->private; - struct list_head *p, *n; + struct link_key *key; - hci_dev_lock(hdev); - list_for_each_safe(p, n, &hdev->link_keys) { - struct link_key *key = list_entry(p, struct link_key, list); + rcu_read_lock(); + list_for_each_entry_rcu(key, &hdev->link_keys, list) seq_printf(f, "%pMR %u %*phN %u\n", &key->bdaddr, key->type, HCI_LINK_KEY_SIZE, key->val, key->pin_len); - } - hci_dev_unlock(hdev); + rcu_read_unlock(); return 0; } @@ -3101,15 +3099,11 @@ void hci_uuids_clear(struct hci_dev *hdev) void hci_link_keys_clear(struct hci_dev *hdev) { - struct list_head *p, *n; - - list_for_each_safe(p, n, &hdev->link_keys) { - struct link_key *key; - - key = list_entry(p, struct link_key, list); + struct link_key *key; - list_del(p); - kfree(key); + list_for_each_entry_rcu(key, &hdev->link_keys, list) { + list_del_rcu(&key->list); + kfree_rcu(key, rcu); } } @@ -3137,9 +3131,14 @@ struct link_key *hci_find_link_key(struct hci_dev *hdev, bdaddr_t *bdaddr) { struct link_key *k; - list_for_each_entry(k, &hdev->link_keys, list) - if (bacmp(bdaddr, &k->bdaddr) == 0) + rcu_read_lock(); + list_for_each_entry_rcu(k, &hdev->link_keys, list) { + if (bacmp(bdaddr, &k->bdaddr) == 0) { + rcu_read_unlock(); return k; + } + } + rcu_read_unlock(); return NULL; } @@ -3290,7 +3289,7 @@ struct link_key *hci_add_link_key(struct hci_dev *hdev, struct hci_conn *conn, key = kzalloc(sizeof(*key), GFP_KERNEL); if (!key) return NULL; - list_add(&key->list, &hdev->link_keys); + list_add_rcu(&key->list, &hdev->link_keys); } BT_DBG("%s key for %pMR type %u", hdev->name, bdaddr, type); @@ -3383,8 +3382,8 @@ int hci_remove_link_key(struct hci_dev *hdev, bdaddr_t *bdaddr) BT_DBG("%s removing %pMR", hdev->name, bdaddr); - list_del(&key->list); - kfree(key); + list_del_rcu(&key->list); + kfree_rcu(key, rcu); return 0; } -- cgit v1.2.3-55-g7522