On 21.07.23 16:57, Alan Stern wrote:
There is a flaw in your reasoning. The operation carried out here is deliberately unsafe (for full-speed devices). It is made before we know the actual maxpacket size for ep0, and as a result it might return an error code even when it works okay. This shouldn't happen, but a lot of USB hardware is unreliable. Therefore we must not ignore the result merely because r < 0. If we do that, the kernel might stop working with some devices.
Right. However, we must make sure we are operating on controlled results. As is we are operating on a random buffer without checking an IO operation has been performed on it. Regards Oliver
