Johan Hovold 8ed339f23d media: gspca/gl860: fix zero-length control requests
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.

Fix the gl860_RTx() helper so that zero-length control reads fail with
an error message instead. Note that there are no current callers that
would trigger this.

Fixes: 4f7cb8837cec ("V4L/DVB (12954): gspca - gl860: Addition of GL860 based webcams")
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
2021-06-02 14:14:16 +02:00
..
2021-06-02 11:16:15 +02:00
2020-06-03 20:59:38 -07:00
2021-03-11 11:59:42 +01:00
2021-03-22 11:52:09 +01:00