[Resend PATCH V4 3/4] usb: Create link files between child device and usb port device.

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. Signed-off-by: Lan Tianyu --- drivers/usb/core/hub.c | 26 ++ 1 file c

[PATCH V4 3/4] usb: Create link files between child device and usb port device.

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. Signed-off-by: Lan Tianyu --- drivers/usb/core/hub.c | 26 ++ 1 file c