disp: msm: sde: cancel delayed_off_work before reinitialization

Canceling delayed_off_work in encoder pre_modeset might not be
executed in all cases, but the following encoder enable might
initialize the work.
This will lead to list corruption as delayed_off work list node
is reinitialized before removing from linked list.
Move canceling delayed_off_work to start of encoder mode_set to
ensure work is canceled before reinitialization.

Change-Id: I38687604f2eedced308ea02019c162022725534e
Signed-off-by: Lei Chen <[email protected]>

msm/sde/sde_encoder.c

@@ -1988,9 +1988,6 @@ static int _sde_encoder_rc_pre_modeset(struct drm_encoder *drm_enc,
 {
 	int ret = 0;
 
-	/* cancel delayed off work, if any */
-	_sde_encoder_rc_cancel_delayed(sde_enc, sw_event);
-
 	mutex_lock(&sde_enc->rc_lock);
 
 	if (sde_enc->rc_state == SDE_ENC_RC_STATE_OFF) {
@@ -2497,6 +2494,9 @@ static void sde_encoder_virt_mode_set(struct drm_encoder *drm_enc,
 		return;
 	}
 
+	/* cancel delayed off work, if any */
+	kthread_cancel_delayed_work_sync(&sde_enc->delayed_off_work);
+
 	/* release resources before seamless mode change */
 	msm_mode = &c_state->msm_mode;
 	ret = sde_encoder_virt_modeset_rc(drm_enc, msm_mode, true);