[Bug 212045] dwc2 gadget mode read call blocks

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=212045

--- Comment #5 from Tomasz Grobelny (tomasz@grobelny.net) ---
The files that functionfs exposes are ep0 (for reading, events), ep1 (for
writing, direction: to host) and ep2 (for reading, direction: to gadget). Not
sure how and why they are named in dmesg. You can find the gadget configuration
here:
https://github.com/tomasz-grobelny/AACS/blob/master/AAServer/src/descriptors.cpp
- line 75 and 84:
                    .bEndpointAddress = 1 | USB_DIR_IN,
                    .bEndpointAddress = 2 | USB_DIR_OUT,

The code that fails/hangs is readWraper function here:
https://github.com/tomasz-grobelny/AACS/blob/master/AAServer/src/AaCommunicator.cpp:493

select succeeds for ep2 and the read blocks. Exactly same function works ok for
ep0 for all 3 hosts that I tested on and the code works fully ok for 2 out of 3
hosts that I tested on. I also know that in principle the 3rd host also should
work because it works with other devices.

Maybe lack of ep2 in the logs is something interesting?

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