On 15/04/16 12:25, Peter Chen wrote:
> On Tue, Apr 05, 2016 at 05:05:12PM +0300, Roger Quadros wrote:
>> + * usb_otg_register() - Register the OTG/dual-role device to OTG core
>> + * @dev: OTG/dual-role controller device.
>> + * @config: OTG configuration.
>> + *
>> + * Registers the OTG/dual-role controller device with the USB OTG core.
>> + *
>> + * Return: struct usb_otg * if success, ERR_PTR() if error.
>> + */
>> +struct usb_otg *usb_otg_register(struct device *dev,
>> + struct usb_otg_config *config)
>> +{
>> + struct usb_otg *otg;
>> + struct otg_wait_data *wait;
>> + int ret = 0;
>> +
>> + if (!dev || !config || !config->fsm_ops)
>> + return ERR_PTR(-EINVAL);
>> +
>> + /* already in list? */
>> + mutex_lock(&otg_list_mutex);
>> + if (usb_otg_get_data(dev)) {
>> + dev_err(dev, "otg: %s: device already in otg list\n",
>> + __func__);
>> + ret = -EINVAL;
>> + goto unlock;
>> + }
>> +
>> + /* allocate and add to list */
>> + otg = kzalloc(sizeof(*otg), GFP_KERNEL);
>> + if (!otg) {
>> + ret = -ENOMEM;
>> + goto unlock;
>> + }
>> +
>> + otg->dev = dev;
>> + otg->caps = config->otg_caps;
>> +
>> + if ((otg->caps->hnp_support || otg->caps->srp_support ||
>> + otg->caps->adp_support) && !config->otg_work)
>> + dev_info(dev, "otg: limiting to dual-role\n");
>
> What does above mean? Customized otg_work item may be dual-role,
> may be full otg.
I'm checking for !config->otg_work so we're sure of using the
default dual-role only work function.
>
>> +
>> + if (config->otg_work) /* custom otg_work ? */
>> + INIT_WORK(&otg->work, config->otg_work);
>> + else
>> + INIT_WORK(&otg->work, usb_otg_work);
>> +
>> + otg->wq = create_singlethread_workqueue("usb_otg");
>> + if (!otg->wq) {
>> + dev_err(dev, "otg: %s: can't create workqueue\n",
>> + __func__);
>> + ret = -ENOMEM;
>> + goto err_wq;
>> + }
>
> I found a bug that caused by non-freezable workqueue, change it
> as freezable please.
>
> https://marc.ttias.be/linux-stable/2016-03/msg00723.php
OK.
>
> I will review the whole set from next week.
Thanks.
--
cheers,
-roger
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