On 11/19/18 5:58 AM, Jarkko Sakkinen wrote: > Please explain a scenario where "!ret_size" would no work given that > both size and partial_data have always positive value? Right, I only looked at the one line above before responding. I'll change it to !ret_size > > I don't understand. In order to maintain backwards compatibility you can > send a new command at any time. No, currently it is not possible to send a new command until the previous response is consumed. -EBUSY is returned if one sends a new command before reading the previous response (or at least part of it). See: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/char/tpm/tpm-dev-common.c#n128 -- Tadeusz
