disp: msm: dsi: add missing dsi ctrl mutex lock in host timing update

Acquire dsi_ctrl->ctrl_lock lock before programming dsi ctrl
registers. Failing this may lead to race conditions in register
programming.
Add missing mutex lock inside dsi_ctrl_host_timing_update().

Change-Id: Ic86cbe282333c0b4d63ae3d5b3356a5d24752203
Signed-off-by: Rajeev Nandan <[email protected]>

msm/dsi/dsi_ctrl.c

@@ -3017,6 +3017,8 @@ int dsi_ctrl_host_timing_update(struct dsi_ctrl *dsi_ctrl)
 		return -EINVAL;
 	}
 
+	mutex_lock(&dsi_ctrl->ctrl_lock);
+
 	if (dsi_ctrl->hw.ops.host_setup)
 		dsi_ctrl->hw.ops.host_setup(&dsi_ctrl->hw,
 				&dsi_ctrl->host_config.common_config);
@@ -3034,9 +3036,11 @@ int dsi_ctrl_host_timing_update(struct dsi_ctrl *dsi_ctrl)
 				0x0, NULL);
 	} else {
 		DSI_CTRL_ERR(dsi_ctrl, "invalid panel mode for resolution switch\n");
+		mutex_unlock(&dsi_ctrl->ctrl_lock);
 		return -EINVAL;
 	}
 
+	mutex_unlock(&dsi_ctrl->ctrl_lock);
 	return 0;
 }