[PATCH v4 0/7] USB MIDI Gadget improvements and bug fixes

["Felipe F. Tonello" <eu@felipetonello.com>]

Patch 7 has changes on how to transmit IN USB requests. It implements a FIFO
of pre-allocated usb requests and uses then as needed, instead of allocating
then on demand. This is my initial implementation and is open for
suggestions and comments.

Patches 1-6 is pretty much straight forward.

changes in v4:
 - pre-alocation of in requests.
 - more code clean up
 - fix memory leak on out requests
 - configure endpoints only when setting up MIDIStreaming interface

Felipe F. Tonello (7):
  usb: gadget: f_midi: Transmit data only when IN ep is enabled
  usb: gadget: f_midi: remove duplicated code
  usb: gadget: define free_ep_req as universal function
  usb: gadget: f_midi: fix leak on failed to enqueue out requests
  usb: gadget: f_midi: set altsettings only for MIDIStreaming interface
  usb: gadget: gmidi: Cleanup legacy code
  usb: gadget: f_midi: pre-allocate IN requests

 drivers/usb/gadget/function/f_midi.c       | 201 ++++++++++++++++++++---------
 drivers/usb/gadget/function/f_sourcesink.c |   6 -
 drivers/usb/gadget/function/g_zero.h       |   1 -
 drivers/usb/gadget/legacy/gmidi.c          |  12 +-
 drivers/usb/gadget/u_f.c                   |   8 ++
 drivers/usb/gadget/u_f.h                   |   3 +-
 6 files changed, 151 insertions(+), 80 deletions(-)

-- 
2.1.4