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 majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
