linux-kernel - Re: [PULL] TPM: MAINTAINERS contacts update and error report fix

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Date:	Thu, 03 May 2012 13:14:40 -0700
From:	Joe Perches <joe@...ches.com>
To:	Rajiv Andrade <srajiv@...ux.vnet.ibm.com>
Cc:	jmorris@...ei.org, pebolle@...cali.nl,
	linux-kernel@...r.kernel.org, tpmdd@...horst.net
Subject: Re: [PULL] TPM: MAINTAINERS contacts update and error report fix

On Thu, 2012-05-03 at 14:10 -0300, Rajiv Andrade wrote:
> The first as the subject implies is just a contacts update, and the second
> makes the driver avoid to mistakenly report the disabled and deactivated TPM
> states as an error.

trivia:

> diff --git a/drivers/char/tpm/tpm.c b/drivers/char/tpm/tpm.c
[]
> @@ -845,7 +845,16 @@ int tpm_do_selftest(struct tpm_chip *chip)
>  		return rc;
>  
>  	do {
> -		rc = __tpm_pcr_read(chip, 0, digest);
> +		/* Attempt to read a PCR value */
> +		cmd.header.in = pcrread_header;
> +		cmd.params.pcrread_in.pcr_idx = cpu_to_be32(0);
> +		rc = tpm_transmit(chip, (u8 *) &cmd, READ_PCR_RESULT_SIZE);
> +
> +		if (rc < TPM_HEADER_SIZE)
> +			return -EFAULT;
> +		else
> +			rc = be32_to_cpu(cmd.header.out.return_code);

The else shouldn't be used here.
Indented code followed by an unindented test is not nice.

> +
>  		if (rc == TPM_ERR_DISABLED || rc == TPM_ERR_DEACTIVATED) {
>  			dev_info(chip->dev,
>  				 "TPM is disabled/deactivated (0x%X)\n", rc);

A more kernel style conformant style looks like:

		rc = tpm_transmit(chip, (u8 *)&cmd, READ_PCR_RESULT_SIZE);
		if (rc < TPM_HEADER_SIZE)
			return -EFAULT;

		rc = be32_to_cpu(cmd.header.out.return_code);
 		if (rc == TPM_ERR_DISABLED || rc == TPM_ERR_DEACTIVATED) {
			etc...


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