[PATCH v4 00/10] Gadget endpoint request allocation and MIDI

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

As discussed with Baolin Wang, Michal Nazarewicz and Felipe Balbi. I propose
the forced buffer alignment of OUT endpoints USB requests. This is implemented
by patches #1 and #3.

That not just simplifies the driver code, but it also prevents nasty bugs when
buflen is not aligned or even less than wMaxPacketSize.

Patch #10 removes direct calls to usb_ep_alloc_request() and use alloc_ep_req()
instead. If accepted, then we should apply to all other gadgets that uses
usb_ep_alloc_request() when possible and encorage drivers to use it instead.

Changes from v3:
 * Added patch #2 which uses size_t on alloc_ep_req() instead of int.

Changes from v2:
 * Simplified logic in patch #1;
 * Added documentation to alloc_ep_req and free_ep_req;
 * Improved commit message on patch #8.

Changes from v1:
 * Added patches #1, #3, #8, #9 ,#10;
 * Patch #4 removes max_t() for buffer alignment with wMaxPacketSize.

Felipe F. Tonello (10):
  usb: gadget: fix usb_ep_align_maybe endianness and new usb_ep_align
  usb: gadget: change len to size_t on alloc_ep_req()
  usb: gadget: align buffer size when allocating for OUT endpoint
  usb: gadget: f_midi: remove alignment code for OUT endpoint
  usb: gadget: f_midi: defaults buflen sizes to 512
  usb: gadget: f_midi: refactor state machine
  usb: gadget: f_midi: drop substreams when disabling endpoint
  usb: gadget: remove useless parameter in alloc_ep_req()
  usb: gadget: f_hid: use free_ep_req()
  usb: gadget: f_hid: use alloc_ep_req()

 drivers/usb/gadget/function/f_hid.c        |  26 +---
 drivers/usb/gadget/function/f_loopback.c   |   9 +-
 drivers/usb/gadget/function/f_midi.c       | 240 +++++++++++++++++------------
 drivers/usb/gadget/function/f_sourcesink.c |  11 +-
 drivers/usb/gadget/legacy/gmidi.c          |   2 +-
 drivers/usb/gadget/u_f.c                   |   6 +-
 drivers/usb/gadget/u_f.h                   |  17 +-
 include/linux/usb/gadget.h                 |  17 +-
 8 files changed, 188 insertions(+), 140 deletions(-)

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2.9.2