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Commit 2bf4086d authored by Alan Stern's avatar Alan Stern Committed by Greg Kroah-Hartman
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usbcore: set device and power states properly 



This patch (as733) fixes up the places where device states and power
states are set in usbcore.  Right now things are duplicated or missing;
this should straighten things out.

The idea is that udev->state is USB_STATE_SUSPENDED exactly when the
device's upstream port has been suspended, whereas
udev->dev.power.power_state.event reflects the result of the last call
to the suspend/resume routines (which might not actually change the
device state, especially if CONFIG_USB_SUSPEND isn't set).


Signed-off-by: default avatarAlan Stern <stern@rowland.harvard.edu>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent 4d064c08

drivers/usb/core/driver.c

+42 −29
Original line number Diff line number Diff line
@@ -755,48 +755,57 @@ EXPORT_SYMBOL_GPL_FUTURE(usb_deregister); 
static int suspend_device(struct usb_device *udev, pm_message_t msg)

{

	struct usb_device_driver	*udriver;

	int				status = 0;



	if (udev->dev.driver == NULL)

		return 0;

		goto done;

	udriver = to_usb_device_driver(udev->dev.driver);

	if (udev->dev.power.power_state.event == msg.event)

		return 0;

	return udriver->suspend(udev, msg);

		goto done;

	status = udriver->suspend(udev, msg);



done:

	if (status == 0)

		udev->dev.power.power_state.event = msg.event;

	return status;

}



/* Caller has locked udev */

static int resume_device(struct usb_device *udev)

{

	struct usb_device_driver	*udriver;

	int				status = 0;



	if (udev->dev.power.power_state.event == PM_EVENT_ON)

		return 0;



	/* mark things as "on" immediately, no matter what errors crop up */

	udev->dev.power.power_state.event = PM_EVENT_ON;

		goto done;



	if (udev->dev.driver == NULL)

		return 0;

		goto done;

	udriver = to_usb_device_driver(udev->dev.driver);

	if (udev->state == USB_STATE_NOTATTACHED)

		return 0;

	return udriver->resume(udev);

		goto done;

	status = udriver->resume(udev);



done:

	if (status == 0)

		udev->dev.power.power_state.event = PM_EVENT_ON;

	return status;

}



/* Caller has locked intf's usb_device */

static int suspend_interface(struct usb_interface *intf, pm_message_t msg)

{

	struct usb_driver	*driver;

	int			status;

	int			status = 0;



	if (intf->dev.driver == NULL)

		return 0;

		goto done;



	driver = to_usb_driver(intf->dev.driver);



	/* with no hardware, USB interfaces only use FREEZE and ON states */

	if (!is_active(intf))

		return 0;

		goto done;



	if (driver->suspend && driver->resume) {

		status = driver->suspend(intf, msg);
@@ -810,8 +819,11 @@ static int suspend_interface(struct usb_interface *intf, pm_message_t msg) 
		dev_warn(&intf->dev, "no suspend for driver %s?\n",

				driver->name);

		mark_quiesced(intf);

		status = 0;

	}



done:

	if (status == 0)

		intf->dev.power.power_state.event = msg.event;

	return status;

}
@@ -820,24 +832,19 @@ static int resume_interface(struct usb_interface *intf) 
{

	struct usb_driver	*driver;

	struct usb_device	*udev;

	int			status;

	int			status = 0;



	if (intf->dev.power.power_state.event == PM_EVENT_ON)

		return 0;

		goto done;



	/* mark things as "on" immediately, no matter what errors crop up */

	intf->dev.power.power_state.event = PM_EVENT_ON;



	if (intf->dev.driver == NULL) {

		intf->dev.power.power_state.event = PM_EVENT_FREEZE;

		return 0;

	}

	if (intf->dev.driver == NULL)

		goto done;



	driver = to_usb_driver(intf->dev.driver);



	udev = interface_to_usbdev(intf);

	if (udev->state == USB_STATE_NOTATTACHED)

		return 0;

		goto done;



	/* if driver was suspended, it has a resume method;

	 * however, sysfs can wrongly mark things as suspended
@@ -845,15 +852,21 @@ static int resume_interface(struct usb_interface *intf) 
	 */

	if (driver->resume) {

		status = driver->resume(intf);

		if (status) {

		if (status)

			dev_err(&intf->dev, "%s error %d\n",

					"resume", status);

			mark_quiesced(intf);

		}

	} else

		else

			mark_active(intf);

	} else {

		dev_warn(&intf->dev, "no resume for driver %s?\n",

				driver->name);

	return 0;

		mark_active(intf);

	}



done:

	if (status == 0)

		intf->dev.power.power_state.event = PM_EVENT_ON;

	return status;

}



/* Caller has locked udev */

drivers/usb/core/hub.c

+4 −6
Original line number Diff line number Diff line
@@ -1582,9 +1582,10 @@ static int __usb_port_suspend (struct usb_device *udev, int port1) 
	if (udev->parent)

		status = hub_port_suspend(hdev_to_hub(udev->parent), port1,

				udev);



	if (status == 0)

		udev->dev.power.power_state = PMSG_SUSPEND;

	else {

		dev_dbg(&udev->dev, "usb suspend\n");

		usb_set_device_state(udev, USB_STATE_SUSPENDED);

	}

	return status;

}
@@ -1617,8 +1618,6 @@ int usb_port_suspend(struct usb_device *udev) 
		return -ENODEV;

	return __usb_port_suspend(udev, udev->portnum);

#else

	/* NOTE:  udev->state unchanged, it's not lying ... */

	udev->dev.power.power_state = PMSG_SUSPEND;

	return 0;

#endif

}
@@ -1647,7 +1646,6 @@ static int finish_port_resume(struct usb_device *udev) 
	usb_set_device_state(udev, udev->actconfig

			? USB_STATE_CONFIGURED

			: USB_STATE_ADDRESS);

	udev->dev.power.power_state = PMSG_ON;



 	/* 10.5.4.5 says be sure devices in the tree are still there.

 	 * For now let's assume the device didn't go crazy on resume,