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Commit bebc56d5 authored by Lan Tianyu's avatar Lan Tianyu Committed by Greg Kroah-Hartman
Browse files

usb: move struct usb_device->children to struct usb_hub_port->child 



Move child's pointer to the struct usb_hub_port since the child device
is directly associated with the port. Provide usb_get_hub_child_device()
to get child's pointer.

Signed-off-by: default avatarLan Tianyu <tianyu.lan@intel.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent f397d7c4

drivers/staging/usbip/usbip_common.c

+1 −2
Original line number Diff line number Diff line
@@ -157,8 +157,7 @@ static void usbip_dump_usb_device(struct usb_device *udev) 
	dev_dbg(dev, "have_langid %d, string_langid %d\n",

		udev->have_langid, udev->string_langid);



	dev_dbg(dev, "maxchild %d, children %p\n",

		udev->maxchild, udev->children);

	dev_dbg(dev, "maxchild %d\n", udev->maxchild);

}



static void usbip_dump_request_type(__u8 rt)

drivers/usb/core/devices.c

+2 −1
Original line number Diff line number Diff line
@@ -590,7 +590,8 @@ static ssize_t usb_device_dump(char __user **buffer, size_t *nbytes, 


	/* Now look at all of this device's children. */

	for (chix = 0; chix < usbdev->maxchild; chix++) {

		struct usb_device *childdev = usbdev->children[chix];

		struct usb_device *childdev =

			usb_get_hub_child_device(usbdev, chix + 1);



		if (childdev) {

			usb_lock_device(childdev);

drivers/usb/core/hub.c

+40 −27
Original line number Diff line number Diff line
@@ -39,6 +39,7 @@ 


struct usb_hub_port {

	void			*port_owner;

	struct usb_device	*child;

};



struct usb_hub {
@@ -93,7 +94,7 @@ static inline int hub_is_superspeed(struct usb_device *hdev) 
	return (hdev->descriptor.bDeviceProtocol == USB_HUB_PR_SS);

}



/* Protect struct usb_device->state and ->children members

/* Protect struct usb_device->state and struct usb_hub_port->child members

 * Note: Both are also protected by ->dev.sem, except that ->state can

 * change to USB_STATE_NOTATTACHED even when the semaphore isn't held. */

static DEFINE_SPINLOCK(device_state_lock);
@@ -176,7 +177,7 @@ static inline char *portspeed(struct usb_hub *hub, int portstatus) 
/* Note that hdev or one of its children must be locked! */

static struct usb_hub *hdev_to_hub(struct usb_device *hdev)

{

	if (!hdev || !hdev->actconfig)

	if (!hdev || !hdev->actconfig || !hdev->maxchild)

		return NULL;

	return usb_get_intfdata(hdev->actconfig->interface[0]);

}
@@ -649,8 +650,8 @@ static int hub_port_disable(struct usb_hub *hub, int port1, int set_state) 
	struct usb_device *hdev = hub->hdev;

	int ret = 0;



	if (hdev->children[port1-1] && set_state)

		usb_set_device_state(hdev->children[port1-1],

	if (hub->port_data[port1-1].child && set_state)

		usb_set_device_state(hub->port_data[port1-1].child,

				USB_STATE_NOTATTACHED);

	if (!hub->error && !hub_is_superspeed(hub->hdev))

		ret = clear_port_feature(hdev, port1, USB_PORT_FEAT_ENABLE);
@@ -806,7 +807,7 @@ static void hub_activate(struct usb_hub *hub, enum hub_activation_type type) 
	 * which ports need attention.

	 */

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

		struct usb_device *udev = hdev->children[port1-1];

		struct usb_device *udev = hub->port_data[port1-1].child;

		u16 portstatus, portchange;



		portstatus = portchange = 0;
@@ -971,8 +972,8 @@ static void hub_quiesce(struct usb_hub *hub, enum hub_quiescing_type type) 
	if (type != HUB_SUSPEND) {

		/* Disconnect all the children */

		for (i = 0; i < hdev->maxchild; ++i) {

			if (hdev->children[i])

				usb_disconnect(&hdev->children[i]);

			if (hub->port_data[i].child)

				usb_disconnect(&hub->port_data[i].child);

		}

	}
@@ -1051,11 +1052,9 @@ static int hub_configure(struct usb_hub *hub, 
	dev_info (hub_dev, "%d port%s detected\n", hdev->maxchild,

		(hdev->maxchild == 1) ? "" : "s");



	hdev->children = kzalloc(hdev->maxchild *

				sizeof(struct usb_device *), GFP_KERNEL);

	hub->port_data = kzalloc(hdev->maxchild * sizeof(struct usb_hub_port),

			GFP_KERNEL);

	if (!hub->port_data || !hdev->children) {

	if (!hub->port_data) {

		ret = -ENOMEM;

		goto fail;

	}
@@ -1287,7 +1286,6 @@ static unsigned highspeed_hubs; 
static void hub_disconnect(struct usb_interface *intf)

{

	struct usb_hub *hub = usb_get_intfdata(intf);

	struct usb_device *hdev = interface_to_usbdev(intf);



	/* Take the hub off the event list and don't let it be added again */

	spin_lock_irq(&hub_event_lock);
@@ -1309,7 +1307,6 @@ static void hub_disconnect(struct usb_interface *intf) 
		highspeed_hubs--;



	usb_free_urb(hub->urb);

	kfree(hdev->children);

	kfree(hub->port_data);

	kfree(hub->descriptor);

	kfree(hub->status);
@@ -1397,6 +1394,7 @@ static int 
hub_ioctl(struct usb_interface *intf, unsigned int code, void *user_data)

{

	struct usb_device *hdev = interface_to_usbdev (intf);

	struct usb_hub *hub = usb_get_intfdata(intf);



	/* assert ifno == 0 (part of hub spec) */

	switch (code) {
@@ -1410,11 +1408,11 @@ hub_ioctl(struct usb_interface *intf, unsigned int code, void *user_data) 
		else {

			info->nports = hdev->maxchild;

			for (i = 0; i < info->nports; i++) {

				if (hdev->children[i] == NULL)

				if (hub->port_data[i].child == NULL)

					info->port[i] = 0;

				else

					info->port[i] =

						hdev->children[i]->devnum;

						hub->port_data[i].child->devnum;

			}

		}

		spin_unlock_irq(&device_state_lock);
@@ -1501,11 +1499,13 @@ bool usb_device_is_owned(struct usb_device *udev) 


static void recursively_mark_NOTATTACHED(struct usb_device *udev)

{

	struct usb_hub	*hub = hdev_to_hub(udev);

	int i;



	for (i = 0; i < udev->maxchild; ++i) {

		if (udev->children[i])

			recursively_mark_NOTATTACHED(udev->children[i]);

		if (hub->port_data[i].child)

			recursively_mark_NOTATTACHED(

				hub->port_data[i].child);

	}

	if (udev->state == USB_STATE_SUSPENDED)

		udev->active_duration -= jiffies;
@@ -1669,6 +1669,7 @@ static void hub_free_dev(struct usb_device *udev) 
void usb_disconnect(struct usb_device **pdev)

{

	struct usb_device	*udev = *pdev;

	struct usb_hub	*hub = hdev_to_hub(udev);

	int			i;



	/* mark the device as inactive, so any further urb submissions for
@@ -1683,8 +1684,8 @@ void usb_disconnect(struct usb_device **pdev) 


	/* Free up all the children before we remove this device */

	for (i = 0; i < udev->maxchild; i++) {

		if (udev->children[i])

			usb_disconnect(&udev->children[i]);

		if (hub->port_data[i].child)

			usb_disconnect(&hub->port_data[i].child);

	}



	/* deallocate hcd/hardware state ... nuking all pending urbs and
@@ -2765,7 +2766,7 @@ static int hub_suspend(struct usb_interface *intf, pm_message_t msg) 
	for (port1 = 1; port1 <= hdev->maxchild; port1++) {

		struct usb_device	*udev;



		udev = hdev->children [port1-1];

		udev = hub->port_data[port1-1].child;

		if (udev && udev->can_submit) {

			dev_warn(&intf->dev, "port %d nyet suspended\n", port1);

			if (PMSG_IS_AUTO(msg))
@@ -3266,7 +3267,7 @@ hub_power_remaining (struct usb_hub *hub) 


	remaining = hdev->bus_mA - hub->descriptor->bHubContrCurrent;

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

		struct usb_device	*udev = hdev->children[port1 - 1];

		struct usb_device	*udev = hub->port_data[port1 - 1].child;

		int			delta;



		if (!udev)
@@ -3330,7 +3331,7 @@ static void hub_port_connect_change(struct usb_hub *hub, int port1, 
#endif



	/* Try to resuscitate an existing device */

	udev = hdev->children[port1-1];

	udev = hub->port_data[port1-1].child;

	if ((portstatus & USB_PORT_STAT_CONNECTION) && udev &&

			udev->state != USB_STATE_NOTATTACHED) {

		usb_lock_device(udev);
@@ -3359,7 +3360,7 @@ static void hub_port_connect_change(struct usb_hub *hub, int port1, 


	/* Disconnect any existing devices under this port */

	if (udev)

		usb_disconnect(&hdev->children[port1-1]);

		usb_disconnect(&hub->port_data[port1-1].child);

	clear_bit(port1, hub->change_bits);



	/* We can forget about a "removed" device when there's a physical
@@ -3474,7 +3475,7 @@ static void hub_port_connect_change(struct usb_hub *hub, int port1, 
				&& highspeed_hubs != 0)

			check_highspeed (hub, udev, port1);



		/* Store the parent's children[] pointer.  At this point

		/* Store the hub port's child pointer.  At this point

		 * udev becomes globally accessible, although presumably

		 * no one will look at it until hdev is unlocked.

		 */
@@ -3488,7 +3489,7 @@ static void hub_port_connect_change(struct usb_hub *hub, int port1, 
		if (hdev->state == USB_STATE_NOTATTACHED)

			status = -ENOTCONN;

		else

			hdev->children[port1-1] = udev;

			hub->port_data[port1-1].child = udev;

		spin_unlock_irq(&device_state_lock);



		/* Run it through the hoops (find a driver, etc) */
@@ -3496,7 +3497,7 @@ static void hub_port_connect_change(struct usb_hub *hub, int port1, 
			status = usb_new_device(udev);

			if (status) {

				spin_lock_irq(&device_state_lock);

				hdev->children[port1-1] = NULL;

				hub->port_data[port1-1].child = NULL;

				spin_unlock_irq(&device_state_lock);

			}

		}
@@ -3542,7 +3543,7 @@ static int hub_handle_remote_wakeup(struct usb_hub *hub, unsigned int port, 
	int ret;



	hdev = hub->hdev;

	udev = hdev->children[port-1];

	udev = hub->port_data[port - 1].child;

	if (!hub_is_superspeed(hdev)) {

		if (!(portchange & USB_PORT_STAT_C_SUSPEND))

			return 0;
@@ -3696,7 +3697,7 @@ static void hub_events(void) 
				 */

				if (!(portstatus & USB_PORT_STAT_ENABLE)

				    && !connect_change

				    && hdev->children[i-1]) {

				    && hub->port_data[i-1].child) {

					dev_err (hub_dev,

					    "port %i "

					    "disabled by hub (EMI?), "
@@ -4234,3 +4235,15 @@ void usb_queue_reset_device(struct usb_interface *iface) 
	schedule_work(&iface->reset_ws);

}

EXPORT_SYMBOL_GPL(usb_queue_reset_device);



struct usb_device *usb_get_hub_child_device(struct usb_device *hdev,

	int port1)

{

	struct usb_hub *hub = hdev_to_hub(hdev);



	if (!hub || port1 > hdev->maxchild || port1 < 1)

		return NULL;

	return hub->port_data[port1 - 1].child;

}

EXPORT_SYMBOL_GPL(usb_get_hub_child_device);

drivers/usb/host/r8a66597-hcd.c

+2 −1
Original line number Diff line number Diff line
@@ -2040,7 +2040,8 @@ static void collect_usb_address_map(struct usb_device *udev, unsigned long *map) 
		map[udev->devnum/32] |= (1 << (udev->devnum % 32));



	for (chix = 0; chix < udev->maxchild; chix++) {

		struct usb_device *childdev = udev->children[chix];

		struct usb_device *childdev =

			usb_get_hub_child_device(udev, chix + 1);



		if (childdev)

			collect_usb_address_map(childdev, map);

include/linux/usb.h

+2 −2
Original line number Diff line number Diff line
@@ -424,7 +424,6 @@ enum usb_device_removable { 
 *	access from userspace

 * @usbfs_dentry: usbfs dentry entry for the device

 * @maxchild: number of ports if hub

 * @children: child devices - USB devices that are attached to this hub

 * @quirks: quirks of the whole device

 * @urbnum: number of URBs submitted for the whole device

 * @active_duration: total time device is not suspended
@@ -491,7 +490,6 @@ struct usb_device { 
	struct list_head filelist;



	int maxchild;

	struct usb_device **children;



	u32 quirks;

	atomic_t urbnum;
@@ -517,6 +515,8 @@ static inline struct usb_device *interface_to_usbdev(struct usb_interface *intf) 


extern struct usb_device *usb_get_dev(struct usb_device *dev);

extern void usb_put_dev(struct usb_device *dev);

extern struct usb_device *usb_get_hub_child_device(struct usb_device *hdev,

	int port1);



/* USB device locking */

#define usb_lock_device(udev)		device_lock(&(udev)->dev)