• David Brownell's avatar
    [PATCH] usb_interface power state · db690874
    David Brownell authored
    This updates the handling of power state for USB interfaces.
    
      - Formalizes an existing invariant:  interface "power state" is a boolean:
        ON when I/O is allowed, and FREEZE otherwise.  It does so by defining
        some inlined helpers, then using them.
    
      - Adds a useful invariant:  the only interfaces marked active are those
        bound to non-suspended drivers.  Later patches build on this invariant.
    
      - Simplifies the interface driver API (and removes some error paths) by
        removing the requirement that they record power state changes during
        suspend and resume callbacks.  Now usbcore does that.
    
    A few drivers were simplified to address that last change.
    Signed-off-by: default avatarDavid Brownell <dbrownell@users.sourceforge.net>
    Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
    
     drivers/usb/core/hub.c       |   33 +++++++++------------
     drivers/usb/core/message.c   |    1
     drivers/usb/core/usb.c       |   65 +++++++++++++++++++++++++++++++++----------
     drivers/usb/core/usb.h       |   18 +++++++++++
     drivers/usb/input/hid-core.c |    2 -
     drivers/usb/misc/usbtest.c   |   10 ------
     drivers/usb/net/pegasus.c    |    2 -
     drivers/usb/net/usbnet.c     |    2 -
     8 files changed, 85 insertions(+), 48 deletions(-)
    db690874
usbtest.c 56.2 KB