[PATCH v4 0/3] drivers: usb: misc: update to use usb_control_msg_{send|recv}() API

[Anant Thazhemadam <anant.thazhemadam@gmail.com>]

The new usb_control_msg_{send|recv}() API provides a more convenient way
of using usb_control_msg() in some usecases. Using this, short reads are
considered as errors, data can be used off the stack, and the need for
the calling function to create a raw usb pipe is eliminated.
This patch series aims to update existing instances of usb_control_msg() 
in drivers/usb/misc/* to usb_control_msg_{send|recv}() appropriately
wherever it would be a good fit, and also update the return value
checking mechanisms in place (if any), as necessary so nothing breaks.

Changes in v4:

  * Drop all proposed changes to drivers (from v3) where the new API
    doesn't fit appropriately.
  * Update commit messages.
  * Link to v3:
      https://lore.kernel.org/linux-usb/YBF9exziI12OCSuA@hovoldconsulting.com/T/#m269ab33b52331c134bbbc77d13cb65c2194a6093

Changes in v3:

  * idmouse, emi26 and emi62 are left unchanged, and are not updated.
    -> since control transfers in idmouse are without a data stage, there's no
       real advantage in using the new helper here.
    -> in emi26, and emi62, FW_LOAD_SIZE = 1048 (> 1024). Thus, if we try to use the
       new helpers, it will result in either build warnings, or memory being allocated.

  * Link to v2:
      https://lore.kernel.org/linux-usb/20201130013103.2580467-1-anant.thazhemadam@gmail.com/T/


Changes in v2:

  * Buffer variables that were previously dynamically allocated are no
    longer dynamically allocated unless they have a variable length
    (since that threw a warning).

  * Link to v1:
        https://lore.kernel.org/linux-usb/20201129160612.1908074-1-anant.thazhemadam@gmail.com/ 



Anant Thazhemadam (3):
  usb: misc: ehset: update to use the usb_control_msg_{send|recv}() API
  usb: misc: ezusb: update to use usb_control_msg_send()
  usb: misc: usbsevseg: update to use usb_control_msg_send()

 drivers/usb/misc/ehset.c     | 76 +++++++++++++++---------------------
 drivers/usb/misc/ezusb.c     | 16 +-------
 drivers/usb/misc/usbsevseg.c | 60 ++++++++--------------------
 3 files changed, 51 insertions(+), 101 deletions(-)

-- 
2.25.1