> So it is a bad choice to use hid_output_raw_report (which calls
> usb_control_msg) in a ff_memless control function. I will just send a
> revert
> patch in some minutes.

Rather than revert, can't we just replace the raw call with
'hid_hw_request()' to send the data?

This is what we have in hid-lg4ff:
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/drivers/hid/hid-lg4ff.c?id=refs/tags/v3.12#n402

Simon

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