[v2,0/3] media: fix zero-length USB control requests

Message

Johan Hovold May 31, 2021, 9:44 a.m. UTC

The direction of the pipe argument must match the request-type direction
bit or control requests may fail depending on the host-controller-driver
implementation.
    
Control transfers without a data stage are treated as OUT requests by
the USB stack and should be using usb_sndctrlpipe(). Failing to do so
will now trigger a warning.

This series fixes the three media drivers that got this wrong.

Johan

Changes in v2
 - keep the rtl28xxu zero-length read request which is needed for
   proper type detection (Eero)


Johan Hovold (3):
  media: gspca/gl860: fix zero-length control requests
  media: gspca/sunplus: fix zero-length control requests
  media: rtl28xxu: fix zero-length control request

 drivers/media/usb/dvb-usb-v2/rtl28xxu.c | 11 ++++++++++-
 drivers/media/usb/gspca/gl860/gl860.c   |  4 ++--
 drivers/media/usb/gspca/sunplus.c       |  8 ++++++--
 3 files changed, 18 insertions(+), 5 deletions(-)