[PATCH 1/2 v2] tpm: cmd_ready command can be issued only after granting locality

Jason Gunthorpe jgg at ziepe.ca
Sun Jan 28 20:15:59 UTC 2018

On Sun, Jan 28, 2018 at 09:51:00AM +0200, Tomas Winkler wrote:

> diff --git a/include/linux/tpm.h b/include/linux/tpm.h
> index bcdd3790e94d..06639fb6ab85 100644
> +++ b/include/linux/tpm.h
> @@ -44,7 +44,7 @@ struct tpm_class_ops {
>  	bool (*update_timeouts)(struct tpm_chip *chip,
>  				unsigned long *timeout_cap);
>  	int (*request_locality)(struct tpm_chip *chip, int loc);
> -	void (*relinquish_locality)(struct tpm_chip *chip, int loc);
> +	int (*relinquish_locality)(struct tpm_chip *chip, int loc);

This seems wrong.. What is the core code supposed to do if relinquish

Just returning an error code from transmit doesn't really do anything
helpful from a broad subsytem perspective.

I think if a driver can fail reliquish then it needs some kind of
strategy to recover.

Suggest trying the reliquish again on every next request until
success, otherwise fail request locality, potentially permanently.

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