linux-kernel - Re: [PATCH v8 5/7] tpm: move tpm_chip definition to include/linux/tpm.h

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Message-ID: <20190129203422.GD11615@linux.intel.com>
Date:   Tue, 29 Jan 2019 22:34:22 +0200
From:   Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:     Roberto Sassu <roberto.sassu@...wei.com>
Cc:     zohar@...ux.ibm.com, david.safford@...com, monty.wiseman@...com,
        matthewgarrett@...gle.com, linux-integrity@...r.kernel.org,
        linux-security-module@...r.kernel.org,
        linux-kernel@...r.kernel.org, keyrings@...r.kernel.org,
        silviu.vlasceanu@...wei.com
Subject: Re: [PATCH v8 5/7] tpm: move tpm_chip definition to
 include/linux/tpm.h

On Thu, Jan 24, 2019 at 04:49:08PM +0100, Roberto Sassu wrote:
> -enum tpm_const {
> -	TPM_MINOR = 224,	/* officially assigned */
> -	TPM_BUFSIZE = 4096,
> -	TPM_NUM_DEVICES = 65536,
> -	TPM_RETRY = 50,		/* 5 seconds */
> -	TPM_NUM_EVENT_LOG_FILES = 3,
> -};

Here using enum has been a bad idea in the first place, as they don't
relate in any meaningful way.

Replace the definition with the following in drivers/char/tpm/tpm.h:

#define TPM_MINOR	224 /* misc backwards compatibility */
#define TPM_BUFSIZE	4096
#define TPM_NUM_DEVICES	65536
#define TPM_RETRY	5 /* seconds */

And only add this to include/linux/tpm.h:

#define TPM_NUM_EVENT_LOG_FILES 3

Otherwise, this looks good.

/Jarkko