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This patch introduces 'enabled' flag in struct usb_ep, and modifies usb_ep_enable() and usb_ep_disable() functions to encapsulate endpoint enabled/disabled state. It helps to avoid enabling endpoints which are already enabled, and disabling endpoints which are already disables. From now USB functions don't have to remember current endpoint enable/disable state, as this state is now handled automatically which makes this API less bug-prone. Signed-off-by: Robert Baldyga <r.baldyga@samsung.com> Signed-off-by: Felipe Balbi <balbi@ti.com>