Bluetooth: remove unneeded hci_conn_hold/put_device()

hci_conn_hold/put_device() is used to control when hci_conn->dev is no
longer needed and can be deleted from the system. Lets first look how they
are currently used throughout the code (excluding HIDP!).

All code that uses hci_conn_hold_device() looks like this:
    ...
    hci_conn_hold_device();
    hci_conn_add_sysfs();
    ...
On the other side, hci_conn_put_device() is exclusively used in
hci_conn_del().

So, considering that hci_conn_del() must not be called twice (which would
fail horribly), we know that hci_conn_put_device() is only called _once_
(which is in hci_conn_del()).
On the other hand, hci_conn_add_sysfs() must not be called twice, either
(it would call device_add twice, which breaks the device, see
drivers/base/core.c). So we know that hci_conn_hold_device() is also
called only once (it's only called directly before hci_conn_add_sysfs()).

So hold and put are known to be called only once. That means we can safely
remove them and directly call hci_conn_del_sysfs() in hci_conn_del().

But there is one issue left: HIDP also uses hci_conn_hold/put_device().
However, this case can be ignored and simply removed as it is totally
broken. The issue is, the only thing HIDP delays with
hci_conn_hold_device() is the removal of the hci_conn->dev from sysfs.
But, the hci_conn device has no mechanism to get notified when its own
parent (hci_dev) gets removed from sysfs. hci_dev_hold/put() does _not_
control when it is removed but only when the device object is created
and destroyed.
And hci_dev calls hci_conn_flush_*() when it removes itself from sysfs,
which itself causes hci_conn_del() to be called, but it does _not_ cause
hci_conn_del_sysfs() to be called, which is wrong.

Hence, we fix it to call hci_conn_del_sysfs() in hci_conn_del(). This
guarantees that a hci_conn object is removed from sysfs _before_ its
parent hci_dev is removed.

The changes to HIDP look scary, wrong and broken. However, if you look at
the HIDP session management, you will notice they're already broken in the
exact _same_ way (ever tried "unplugging" HIDP devices? Breaks _all_ the
time).
So this patch only makes HIDP look _scary_ and _obviously broken_. It does
not break HIDP itself, it already is!

See later patches in this series which fix HIDP to use proper
session-management.

Signed-off-by: David Herrmann <dh.herrmann@gmail.com>
Acked-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>

diff --git a/include/net/bluetooth/hci_core.h b/include/net/bluetooth/hci_core.h
index 78ea9c7c202c8f9738cc50d2d726c067b6f933fe..5590cc4412c68e52e20de67f20391a9510272edf 100644 (file)
--- a/include/net/bluetooth/hci_core.h
+++ b/include/net/bluetooth/hci_core.h
@@ -345,7 +345,6 @@ struct hci_conn {
        struct timer_list auto_accept_timer;
 
        struct device   dev;
-       atomic_t        devref;
 
        struct hci_dev  *hdev;
        void            *l2cap_data;
@@ -601,9 +600,6 @@ int hci_conn_switch_role(struct hci_conn *conn, __u8 role);
 
 void hci_conn_enter_active_mode(struct hci_conn *conn, __u8 force_active);
 
-void hci_conn_hold_device(struct hci_conn *conn);
-void hci_conn_put_device(struct hci_conn *conn);
-
 static inline void hci_conn_hold(struct hci_conn *conn)
 {
        BT_DBG("hcon %p orig refcnt %d", conn, atomic_read(&conn->refcnt));

diff --git a/net/bluetooth/hci_conn.c b/net/bluetooth/hci_conn.c
index b1a02ce39a202e2b9f729845de9e7b60365f465f..6b5b8e77cf0b9e51d65b1038f23d06619a00e0c9 100644 (file)
--- a/net/bluetooth/hci_conn.c
+++ b/net/bluetooth/hci_conn.c
@@ -410,8 +410,6 @@ struct hci_conn *hci_conn_add(struct hci_dev *hdev, int type, bdaddr_t *dst)
        if (hdev->notify)
                hdev->notify(hdev, HCI_NOTIFY_CONN_ADD);
 
-       atomic_set(&conn->devref, 0);
-
        hci_conn_init_sysfs(conn);
 
        return conn;
@@ -460,7 +458,7 @@ int hci_conn_del(struct hci_conn *conn)
 
        skb_queue_purge(&conn->data_q);
 
-       hci_conn_put_device(conn);
+       hci_conn_del_sysfs(conn);
 
        hci_dev_put(hdev);
 
@@ -847,19 +845,6 @@ void hci_conn_check_pending(struct hci_dev *hdev)
        hci_dev_unlock(hdev);
 }
 
-void hci_conn_hold_device(struct hci_conn *conn)
-{
-       atomic_inc(&conn->devref);
-}
-EXPORT_SYMBOL(hci_conn_hold_device);
-
-void hci_conn_put_device(struct hci_conn *conn)
-{
-       if (atomic_dec_and_test(&conn->devref))
-               hci_conn_del_sysfs(conn);
-}
-EXPORT_SYMBOL(hci_conn_put_device);
-
 int hci_get_conn_list(void __user *arg)
 {
        struct hci_conn *c;

diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c
index f6ea3c734269670ab23c60c5ed55f45af31ddc42..688c1a9949cc824b00e5323afe08b0a164b25236 100644 (file)
--- a/net/bluetooth/hci_event.c
+++ b/net/bluetooth/hci_event.c
@@ -1706,7 +1706,6 @@ static void hci_conn_complete_evt(struct hci_dev *hdev, struct sk_buff *skb)
                } else
                        conn->state = BT_CONNECTED;
 
-               hci_conn_hold_device(conn);
                hci_conn_add_sysfs(conn);
 
                if (test_bit(HCI_AUTH, &hdev->flags))
@@ -2987,7 +2986,6 @@ static void hci_sync_conn_complete_evt(struct hci_dev *hdev,
                conn->handle = __le16_to_cpu(ev->handle);
                conn->state  = BT_CONNECTED;
 
-               hci_conn_hold_device(conn);
                hci_conn_add_sysfs(conn);
                break;
 
@@ -3452,7 +3450,6 @@ static void hci_phy_link_complete_evt(struct hci_dev *hdev,
        hcon->disc_timeout = HCI_DISCONN_TIMEOUT;
        hci_conn_drop(hcon);
 
-       hci_conn_hold_device(hcon);
        hci_conn_add_sysfs(hcon);
 
        amp_physical_cfm(bredr_hcon, hcon);
@@ -3586,7 +3583,6 @@ static void hci_le_conn_complete_evt(struct hci_dev *hdev, struct sk_buff *skb)
        conn->handle = __le16_to_cpu(ev->handle);
        conn->state = BT_CONNECTED;
 
-       hci_conn_hold_device(conn);
        hci_conn_add_sysfs(conn);
 
        hci_proto_connect_cfm(conn, ev->status);

diff --git a/net/bluetooth/hidp/core.c b/net/bluetooth/hidp/core.c
index 4ab82cb3eac32d6f95ebade82116a7595d65941d..9734136d64311f7632115b509a1c28d1ae0e443c 100644 (file)
--- a/net/bluetooth/hidp/core.c
+++ b/net/bluetooth/hidp/core.c
@@ -73,18 +73,6 @@ static struct hidp_session *__hidp_get_session(bdaddr_t *bdaddr)
        return NULL;
 }
 
-static void __hidp_link_session(struct hidp_session *session)
-{
-       list_add(&session->list, &hidp_session_list);
-}
-
-static void __hidp_unlink_session(struct hidp_session *session)
-{
-       hci_conn_put_device(session->conn);
-
-       list_del(&session->list);
-}
-
 static void __hidp_copy_session(struct hidp_session *session, struct hidp_conninfo *ci)
 {
        memset(ci, 0, sizeof(*ci));
@@ -760,7 +748,7 @@ static int hidp_session(void *arg)
 
        fput(session->ctrl_sock->file);
 
-       __hidp_unlink_session(session);
+       list_del(&session->list);
 
        up_write(&hidp_session_sem);
 
@@ -783,8 +771,6 @@ static struct hci_conn *hidp_get_connection(struct hidp_session *session)
 
        hci_dev_lock(hdev);
        conn = hci_conn_hash_lookup_ba(hdev, ACL_LINK, dst);
-       if (conn)
-               hci_conn_hold_device(conn);
        hci_dev_unlock(hdev);
 
        hci_dev_put(hdev);
@@ -1026,7 +1012,7 @@ int hidp_add_connection(struct hidp_connadd_req *req, struct socket *ctrl_sock,
        session->flags   = req->flags & (1 << HIDP_BLUETOOTH_VENDOR_ID);
        session->idle_to = req->idle_to;
 
-       __hidp_link_session(session);
+       list_add(&session->list, &hidp_session_list);
 
        if (req->rd_size > 0) {
                err = hidp_setup_hid(session, req);
@@ -1106,7 +1092,7 @@ unlink:
        session->rd_data = NULL;
 
 purge:
-       __hidp_unlink_session(session);
+       list_del(&session->list);
 
        skb_queue_purge(&session->ctrl_transmit);
        skb_queue_purge(&session->intr_transmit);