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usb: Create link files between child device and usb port device.

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To show the relationship between usb port and child device,
add link file "port" under usb device's sysfs directoy and
"device" under usb port device's sysfs directory. They are linked
to each other.

Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Lan Tianyu <tianyu.lan@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Lan Tianyu 2013-01-20 01:53:33 +08:00 committed by Greg Kroah-Hartman
parent cef7468caf
commit fde2638031
1 changed files with 26 additions and 0 deletions
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26
drivers/usb/core/hub.c
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@ -1989,6 +1989,14 @@ void usb_disconnect(struct usb_device **pdev)
usb_disable_device(udev, 0);
usb_hcd_synchronize_unlinks(udev);
if (udev->parent) {
struct usb_port *port_dev =
hdev_to_hub(udev->parent)->ports[udev->portnum - 1];
sysfs_remove_link(&udev->dev.kobj, "port");
sysfs_remove_link(&port_dev->dev.kobj, "device");
}
usb_remove_ep_devs(&udev->ep0);
usb_unlock_device(udev);
@ -2281,6 +2289,24 @@ int usb_new_device(struct usb_device *udev)
goto fail;
}
/* Create link files between child device and usb port device. */
if (udev->parent) {
struct usb_port *port_dev =
hdev_to_hub(udev->parent)->ports[udev->portnum - 1];
err = sysfs_create_link(&udev->dev.kobj,
&port_dev->dev.kobj, "port");
if (err)
goto fail;
err = sysfs_create_link(&port_dev->dev.kobj,
&udev->dev.kobj, "device");
if (err) {
sysfs_remove_link(&udev->dev.kobj, "port");
goto fail;
}
}
(void) usb_create_ep_devs(&udev->dev, &udev->ep0, udev);
usb_mark_last_busy(udev);
pm_runtime_put_sync_autosuspend(&udev->dev);