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Bluetooth: Fix nested sleeps

Browse Source 
l2cap/rfcomm/sco_sock_accept() are wait loops which may acquire
sleeping locks. Since both wait loops and sleeping locks use
task_struct.state to sleep and wake, the nested sleeping locks
destroy the wait loop state.

Use the newly-minted wait_woken() and DEFINE_WAIT_FUNC() for the
wait loop. DEFINE_WAIT_FUNC() allows an alternate wake function
to be specified; in this case, the predefined scheduler function,
woken_wake_function(). This wait construct ensures wakeups will
not be missed without requiring the wait loop to set the
task state before condition evaluation. How this works:

 CPU 0                            |  CPU 1
                                  |
                                  | is <condition> set?
                                  | no
set <condition>                   |
                                  |
wake_up_interruptible             |
  woken_wake_function             |
    set WQ_FLAG_WOKEN             |
    try_to_wake_up                |
                                  | wait_woken
                                  |   set TASK_INTERRUPTIBLE
                                  |   WQ_FLAG_WOKEN? yes
                                  |   set TASK_RUNNING
                                  |
                                  | - loop -
				  |
				  | is <condition> set?
                                  | yes - exit wait loop

Fixes "do not call blocking ops when !TASK_RUNNING" warnings
in l2cap_sock_accept(), rfcomm_sock_accept() and sco_sock_accept().

Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
This commit is contained in:
Peter Hurley 2015-01-23 12:16:53 -05:00 committed by Johan Hedberg
parent a1443f5a27
commit dfb2fae7cd
3 changed files with 11 additions and 15 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
net/bluetooth/l2cap_sock.c
View File

@ -302,7 +302,7 @@ done:
static int l2cap_sock_accept(struct socket *sock, struct socket *newsock,
int flags)
{
DECLARE_WAITQUEUE(wait, current);
DEFINE_WAIT_FUNC(wait, woken_wake_function);
struct sock *sk = sock->sk, *nsk;
long timeo;
int err = 0;
@ -316,8 +316,6 @@ static int l2cap_sock_accept(struct socket *sock, struct socket *newsock,
/* Wait for an incoming connection. (wake-one). */
add_wait_queue_exclusive(sk_sleep(sk), &wait);
while (1) {
set_current_state(TASK_INTERRUPTIBLE);
if (sk->sk_state != BT_LISTEN) {
err = -EBADFD;
break;
@ -338,10 +336,11 @@ static int l2cap_sock_accept(struct socket *sock, struct socket *newsock,
}
release_sock(sk);
timeo = schedule_timeout(timeo);
timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo);
lock_sock_nested(sk, L2CAP_NESTING_PARENT);
}
__set_current_state(TASK_RUNNING);
remove_wait_queue(sk_sleep(sk), &wait);
if (err)

9
net/bluetooth/rfcomm/sock.c
View File

@ -468,7 +468,7 @@ done:
static int rfcomm_sock_accept(struct socket *sock, struct socket *newsock, int flags)
{
DECLARE_WAITQUEUE(wait, current);
DEFINE_WAIT_FUNC(wait, woken_wake_function);
struct sock *sk = sock->sk, *nsk;
long timeo;
int err = 0;
@ -487,8 +487,6 @@ static int rfcomm_sock_accept(struct socket *sock, struct socket *newsock, int f
/* Wait for an incoming connection. (wake-one). */
add_wait_queue_exclusive(sk_sleep(sk), &wait);
while (1) {
set_current_state(TASK_INTERRUPTIBLE);
if (sk->sk_state != BT_LISTEN) {
err = -EBADFD;
break;
@ -509,10 +507,11 @@ static int rfcomm_sock_accept(struct socket *sock, struct socket *newsock, int f
}
release_sock(sk);
timeo = schedule_timeout(timeo);
timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo);
lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
}
__set_current_state(TASK_RUNNING);
remove_wait_queue(sk_sleep(sk), &wait);
if (err)

8
net/bluetooth/sco.c
View File

@ -618,7 +618,7 @@ done:
static int sco_sock_accept(struct socket *sock, struct socket *newsock, int flags)
{
DECLARE_WAITQUEUE(wait, current);
DEFINE_WAIT_FUNC(wait, woken_wake_function);
struct sock *sk = sock->sk, *ch;
long timeo;
int err = 0;
@ -632,8 +632,6 @@ static int sco_sock_accept(struct socket *sock, struct socket *newsock, int flag
/* Wait for an incoming connection. (wake-one). */
add_wait_queue_exclusive(sk_sleep(sk), &wait);
while (1) {
set_current_state(TASK_INTERRUPTIBLE);
if (sk->sk_state != BT_LISTEN) {
err = -EBADFD;
break;
@ -654,10 +652,10 @@ static int sco_sock_accept(struct socket *sock, struct socket *newsock, int flag
}
release_sock(sk);
timeo = schedule_timeout(timeo);
timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo);
lock_sock(sk);
}
__set_current_state(TASK_RUNNING);
remove_wait_queue(sk_sleep(sk), &wait);
if (err)