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Commit d5c3834e authored by Dan Williams's avatar Dan Williams Committed by Greg Kroah-Hartman
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usb: make usb_port flags atomic, rename did_runtime_put to child_usage 



We want to manipulate ->did_runtime_put in usb_port_runtime_resume(),
but we don't want that to collide with other updates.  Move usb_port
flags to new port-bitmap fields in usb_hub. "did_runtime_put" is renamed
"child_usage_bits" to reflect that it is strictly standing in for the
fact that usb_devices are not the device_model children of their parent
port.

Signed-off-by: default avatarDan Williams <dan.j.williams@intel.com>
Acked-by: default avatarAlan Stern <stern@rowland.harvard.edu>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent b7e38eac

drivers/usb/core/hub.c

+20 −19
Original line number Diff line number Diff line
@@ -751,16 +751,20 @@ int usb_hub_set_port_power(struct usb_device *hdev, struct usb_hub *hub, 
			   int port1, bool set)

{

	int ret;

	struct usb_port *port_dev = hub->ports[port1 - 1];



	if (set)

		ret = set_port_feature(hdev, port1, USB_PORT_FEAT_POWER);

	else

		ret = usb_clear_port_feature(hdev, port1, USB_PORT_FEAT_POWER);



	if (!ret)

		port_dev->power_is_on = set;

	if (ret)

		return ret;



	if (set)

		set_bit(port1, hub->power_bits);

	else

		clear_bit(port1, hub->power_bits);

	return 0;

}



/**
@@ -839,7 +843,7 @@ static unsigned hub_power_on(struct usb_hub *hub, bool do_delay) 
		dev_dbg(hub->intfdev, "trying to enable port power on "

				"non-switchable hub\n");

	for (port1 = 1; port1 <= hub->hdev->maxchild; port1++)

		if (hub->ports[port1 - 1]->power_is_on)

		if (test_bit(port1, hub->power_bits))

			set_port_feature(hub->hdev, port1, USB_PORT_FEAT_POWER);

		else

			usb_clear_port_feature(hub->hdev, port1,
@@ -1180,15 +1184,13 @@ static void hub_activate(struct usb_hub *hub, enum hub_activation_type type) 
				set_bit(port1, hub->change_bits);



		} else if (udev->persist_enabled) {

			struct usb_port *port_dev = hub->ports[port1 - 1];



#ifdef CONFIG_PM

			udev->reset_resume = 1;

#endif

			/* Don't set the change_bits when the device

			 * was powered off.

			 */

			if (port_dev->power_is_on)

			if (test_bit(port1, hub->power_bits))

				set_bit(port1, hub->change_bits);



		} else {
@@ -2096,16 +2098,15 @@ void usb_disconnect(struct usb_device **pdev) 
	usb_hcd_synchronize_unlinks(udev);



	if (udev->parent) {

		int port1 = udev->portnum;

		struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent);

		struct usb_port	*port_dev = hub->ports[udev->portnum - 1];

		struct usb_port	*port_dev = hub->ports[port1 - 1];



		sysfs_remove_link(&udev->dev.kobj, "port");

		sysfs_remove_link(&port_dev->dev.kobj, "device");



		if (!port_dev->did_runtime_put)

		if (test_and_clear_bit(port1, hub->child_usage_bits))

			pm_runtime_put(&port_dev->dev);

		else

			port_dev->did_runtime_put = false;

	}



	usb_remove_ep_devs(&udev->ep0);
@@ -2416,7 +2417,8 @@ int usb_new_device(struct usb_device *udev) 
	/* Create link files between child device and usb port device. */

	if (udev->parent) {

		struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent);

		struct usb_port	*port_dev = hub->ports[udev->portnum - 1];

		int port1 = udev->portnum;

		struct usb_port	*port_dev = hub->ports[port1 - 1];



		err = sysfs_create_link(&udev->dev.kobj,

				&port_dev->dev.kobj, "port");
@@ -2430,6 +2432,7 @@ int usb_new_device(struct usb_device *udev) 
			goto fail;

		}



		if (!test_and_set_bit(port1, hub->child_usage_bits))

			pm_runtime_get_sync(&port_dev->dev);

	}
@@ -3100,10 +3103,9 @@ int usb_port_suspend(struct usb_device *udev, pm_message_t msg) 
		usb_set_device_state(udev, USB_STATE_SUSPENDED);

	}



	if (status == 0 && !udev->do_remote_wakeup && udev->persist_enabled) {

	if (status == 0 && !udev->do_remote_wakeup && udev->persist_enabled

			&& test_and_clear_bit(port1, hub->child_usage_bits))

		pm_runtime_put_sync(&port_dev->dev);

		port_dev->did_runtime_put = true;

	}



	usb_mark_last_busy(hub->hdev);

	return status;
@@ -3245,9 +3247,8 @@ int usb_port_resume(struct usb_device *udev, pm_message_t msg) 
	int		status;

	u16		portchange, portstatus;



	if (port_dev->did_runtime_put) {

	if (!test_and_set_bit(port1, hub->child_usage_bits)) {

		status = pm_runtime_get_sync(&port_dev->dev);

		port_dev->did_runtime_put = false;

		if (status < 0) {

			dev_dbg(&udev->dev, "can't resume usb port, status %d\n",

					status);

drivers/usb/core/hub.h

+3 −4
Original line number Diff line number Diff line
@@ -51,6 +51,9 @@ struct usb_hub { 
							device present */

	unsigned long		wakeup_bits[1];	/* ports that have signaled

							remote wakeup */

	unsigned long		power_bits[1]; /* ports that are powered */

	unsigned long		child_usage_bits[1]; /* ports powered on for

							children */

#if USB_MAXCHILDREN > 31 /* 8*sizeof(unsigned long) - 1 */

#error event_bits[] is too short!

#endif
@@ -86,8 +89,6 @@ struct usb_hub { 
 * @connect_type: port's connect type

 * @location: opaque representation of platform connector location

 * @portnum: port index num based one

 * @power_is_on: port's power state

 * @did_runtime_put: port has done pm_runtime_put().

 */

struct usb_port {

	struct usb_device *child;
@@ -97,8 +98,6 @@ struct usb_port { 
	enum usb_port_connect_type connect_type;

	usb_port_location_t location;

	u8 portnum;

	unsigned power_is_on:1;

	unsigned did_runtime_put:1;

};



#define to_usb_port(_dev) \

drivers/usb/core/port.c

+2 −2
Original line number Diff line number Diff line
@@ -82,7 +82,7 @@ static int usb_port_runtime_resume(struct device *dev) 
	if (!hub)

		return -EINVAL;

	if (hub->in_reset) {

		port_dev->power_is_on = 1;

		set_bit(port1, hub->power_bits);

		return 0;

	}
@@ -320,7 +320,7 @@ int usb_hub_create_port_device(struct usb_hub *hub, int port1) 


	hub->ports[port1 - 1] = port_dev;

	port_dev->portnum = port1;

	port_dev->power_is_on = true;

	set_bit(port1, hub->power_bits);

	port_dev->dev.parent = hub->intfdev;

	port_dev->dev.groups = port_dev_group;

	port_dev->dev.type = &usb_port_device_type;