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Bluetooth: cmtp: Fix module reference

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We cannot call module_put(THIS_MODULE) if this is our last reference. Otherwise,
this call may cleanup our module before it returns.

Gladly, the kthread API provides a simple wrapper for us. So lets use
module_put_and_exit() to avoid a race condition with the module cleanup code.

Signed-off-by: David Herrmann <dh.herrmann@googlemail.com>
Acked-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>
This commit is contained in:
David Herrmann 2011-11-19 13:23:32 +01:00 committed by Gustavo F. Padovan
parent 2ac654f740
commit 48b28b8db9
1 changed files with 3 additions and 2 deletions
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5
net/bluetooth/cmtp/core.c
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@ -67,14 +67,12 @@ static struct cmtp_session *__cmtp_get_session(bdaddr_t *bdaddr)
static void __cmtp_link_session(struct cmtp_session *session)
{
__module_get(THIS_MODULE);
list_add(&session->list, &cmtp_session_list);
}
static void __cmtp_unlink_session(struct cmtp_session *session)
{
list_del(&session->list);
module_put(THIS_MODULE);
}
static void __cmtp_copy_session(struct cmtp_session *session, struct cmtp_conninfo *ci)
@ -327,6 +325,7 @@ static int cmtp_session(void *arg)
up_write(&cmtp_session_sem);
kfree(session);
module_put_and_exit(0);
return 0;
}
@ -376,9 +375,11 @@ int cmtp_add_connection(struct cmtp_connadd_req *req, struct socket *sock)
__cmtp_link_session(session);
__module_get(THIS_MODULE);
session->task = kthread_run(cmtp_session, session, "kcmtpd_ctr_%d",
session->num);
if (IS_ERR(session->task)) {
module_put(THIS_MODULE);
err = PTR_ERR(session->task);
goto unlink;
}