[Bug 86931] hid-generic 0005:099A:0500.0001: unknown main item tag 0x0

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=86931

--- Comment #13 from Kai Krakow (hurikhan77+bko@gmail.com) ---
Randy,

the underlying issue is quite easy to understand:

All Microsoft Xbox controllers are sending a NUL terminated HID descriptor
block. If we strip it away for those devices, the message is gone. This is
probably true for some other vendors (as reported here for Apple Magic Mouse).

We are doing it here around these lines to avoid the warning for Xbox
controllers:
https://github.com/atar-axis/xpadneo/commit/1e6b074506b85d03d2636beca528177f482029b8

So maybe the HID parser should just ignore a single trailing NUL byte and
accept that some device vendors just do that.

OTOH, it may be useful to warn about it, so device developers can properly fix
their HID descriptors. And for that case, rate limiting is the proper
implementation to work around other side effects (like overwhelming an UART
console).

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