Am Montag, den 26.02.2018, 16:41 +0200 schrieb Ran Shalit:
> Hello,
>
> When performing usb transfer we request for maximum size of transfer,
> yet another size of message (shorter or longer) might be sent from
> device to host.
>
> Are both cases (shorter/longer) legal in usb standard ?
No. Shorter is OK, longer is not. Remember that USB transfers
are packaged. A transfer is divided into packages. A transfer is
terminated prematurely if a package is not filled to capacity.
I would suggest you get an introductory book and read the kernel's
documentation on the API. Short transfers are described.
HTH
Oliver
--
To unsubscribe from this list: send the line "unsubscribe linux-usb" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
