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authorAndrea Parri <andrea.parri@amarulasolutions.com>2018-08-14 20:41:06 +0200
committerMarcel Holtmann <marcel@holtmann.org>2018-09-27 11:59:58 +0200
commit5aac49378742a52bbe8af3d25bc51b487be7b17f (patch)
tree766b8ef63da32898842943c4d4df7d63b9b04af1 /net/bluetooth/hidp
parent1042caa79e9351b81ed19dc8d2d7fd6ff51a4422 (diff)
Bluetooth: Remove unnecessary smp_mb__{before,after}_atomic
The barriers are unneeded; wait_woken() and woken_wake_function() already provide us with the required synchronization: remove them and document that we're relying on the (implicit) synchronization provided by wait_woken() and woken_wake_function(). Signed-off-by: Andrea Parri <andrea.parri@amarulasolutions.com> Reviewed-by: Brian Norris <computersforpeace@gmail.com> Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Diffstat (limited to 'net/bluetooth/hidp')
-rw-r--r--net/bluetooth/hidp/core.c13
1 files changed, 8 insertions, 5 deletions
diff --git a/net/bluetooth/hidp/core.c b/net/bluetooth/hidp/core.c
index 253975cce943..3734dc1788b4 100644
--- a/net/bluetooth/hidp/core.c
+++ b/net/bluetooth/hidp/core.c
@@ -1074,6 +1074,10 @@ static int hidp_session_start_sync(struct hidp_session *session)
static void hidp_session_terminate(struct hidp_session *session)
{
atomic_inc(&session->terminate);
+ /*
+ * See the comment preceding the call to wait_woken()
+ * in hidp_session_run().
+ */
wake_up_interruptible(&hidp_session_wq);
}
@@ -1193,8 +1197,6 @@ static void hidp_session_run(struct hidp_session *session)
* thread is woken up by ->sk_state_changed().
*/
- /* Ensure session->terminate is updated */
- smp_mb__before_atomic();
if (atomic_read(&session->terminate))
break;
@@ -1228,14 +1230,15 @@ static void hidp_session_run(struct hidp_session *session)
hidp_process_transmit(session, &session->ctrl_transmit,
session->ctrl_sock);
+ /*
+ * wait_woken() performs the necessary memory barriers
+ * for us; see the header comment for this primitive.
+ */
wait_woken(&wait, TASK_INTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT);
}
remove_wait_queue(&hidp_session_wq, &wait);
atomic_inc(&session->terminate);
-
- /* Ensure session->terminate is updated */
- smp_mb__after_atomic();
}
static int hidp_session_wake_function(wait_queue_entry_t *wait,