linux-kernel - Re: [PATCH v8 1/7] tpm: dynamically allocate the allocated

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Date:   Wed, 30 Jan 2019 08:52:40 +0100
From:   Roberto Sassu <roberto.sassu@...wei.com>
To:     Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.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 1/7] tpm: dynamically allocate the allocated_banks
 array

On 1/29/2019 8:29 PM, Jarkko Sakkinen wrote:
> On Thu, Jan 24, 2019 at 04:49:04PM +0100, Roberto Sassu wrote:
>> +	chip->allocated_banks = kcalloc(1, sizeof(*chip->allocated_banks),
>> +					GFP_KERNEL);
>> +	if (!chip->allocated_banks) {
>> +		rc = -ENOMEM;
>> +		goto out;
>> +	}
>> +
>> +	chip->allocated_banks[0] = TPM2_ALG_SHA1;
>> +	chip->nr_allocated_banks = 1;
> 
> Everything else looks nice in this patch except this.
> 
> You always branch for TPM 1.2, and it will always have just SHA1. This
> is unnecessary.

Without this, users of the TPM driver have to call tpm_is_tpm2() first,
while instead they can look directly at chip->allocated_banks.

Roberto


> /Jarkko
> 

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