• Alan Stern's avatar
    USB: add reset_resume method · f07600cf
    Alan Stern authored
    
    
    This patch (as918) introduces a new USB driver method: reset_resume.
    It is called when a device needs to be reset as part of a resume
    procedure (whether because of a device quirk or because of the
    USB-Persist facility), thereby taking over a role formerly assigned to
    the post_reset method.  As a consequence, post_reset no longer needs
    an argument indicating whether it is being called as part of a
    reset-resume.  This separation of functions makes the code clearer.
    
    In addition, the pre_reset and post_reset method return types are
    changed; they now must return an error code.  The return value is
    unused at present, but at some later time we may unbind drivers and
    re-probe if they encounter an error during reset handling.
    
    The existing pre_reset and post_reset methods in the usbhid,
    usb-storage, and hub drivers are updated to match the new
    requirements.  For usbhid the post_reset routine is also used for
    reset_resume (duplicate method pointers); for the other drivers a new
    reset_resume routine is added.  The change to hub.c looks bigger than
    it really is, because mark_children_for_reset_resume() gets moved down
    next to the new hub_reset_resume() routine.
    
    A minor change to usb-storage makes the usb_stor_report_bus_reset()
    routine acquire the host lock instead of requiring the caller to hold
    it already.
    Signed-off-by: default avatarAlan Stern <stern@rowland.harvard.edu>
    Signed-off-by: default avatarJiri Kosina <jkosina@suse.cz>
    CC: Matthew Dharm <mdharm-usb@one-eyed-alien.net>
    Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
    
    f07600cf
hub.c 84 KB