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SubjectRe: [PATCH v3 1/5] tpm: change the end marker of the active_banks array to zero
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On 11/1/2018 3:42 PM, Mimi Zohar wrote:
> On Wed, 2018-10-31 at 10:43 -0400, Mimi Zohar wrote:
>> On Tue, 2018-10-30 at 16:47 +0100, Roberto Sassu wrote:
>>> This patch changes the end marker of the active_banks array from
>>> TPM2_ALG_ERROR to zero.
>>
>> The patch description is a bit off.
>>
>> TPM2_ALG_ERROR is defined as zero.  Since tpm_chip_alloc() calls
>> kzalloc to allocate the structure, there is no need to explicitly set
>> the active_banks end marker to TPM2_ALG_ERROR, nor is there a need to
>> explicitly test for the end marker.
>>
>> This patch removes explicitly setting the end marker and changes the
>> coding style.
>>
>>>
>>> Signed-off-by: Roberto Sassu <roberto.sassu@huawei.com>
>>> ---
>>> drivers/char/tpm/tpm-interface.c | 2 +-
>>> drivers/char/tpm/tpm2-cmd.c | 3 ---
>>> 2 files changed, 1 insertion(+), 4 deletions(-)
>>>
>>> diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c
>>> index 1a803b0cf980..f7fc4b5ee239 100644
>>> --- a/drivers/char/tpm/tpm-interface.c
>>> +++ b/drivers/char/tpm/tpm-interface.c
>>> @@ -1051,7 +1051,7 @@ int tpm_pcr_extend(struct tpm_chip *chip, int pcr_idx, const u8 *hash)
>>> memset(digest_list, 0, sizeof(digest_list));
>>>
>>> for (i = 0; i < ARRAY_SIZE(chip->active_banks) &&
>>> - chip->active_banks[i] != TPM2_ALG_ERROR; i++) {
>>> + chip->active_banks[i]; i++) {
>>> digest_list[i].alg_id = chip->active_banks[i];
>>> memcpy(digest_list[i].digest, hash, TPM_DIGEST_SIZE);
>>> count++;
>
> The fourth patch further updates this code.  Please move those changes
> to this first patch.  No need to touch the same code in both places.

alg_id is introduced in patch 4/5. It cannot be moved here.

Roberto


> for (i = 0; i < ARRAY_SIZE(chip->active_banks) &&
> - chip->active_banks[i]; i++) {
> - digest_list[i].alg_id = chip->active_banks[i];
> + chip->active_banks[i].alg_id; i++) {
> + digest_list[i].alg_id = chip->active_banks[i].alg_id;
> memcpy(digest_list[i].digest, hash, TPM_DIGEST_SIZE);
> count++;
> }
> Mimi
>
>>> diff --git a/drivers/char/tpm/tpm2-cmd.c b/drivers/char/tpm/tpm2-cmd.c
>>> index c31b490bd41d..046c9d8f3c1e 100644
>>> --- a/drivers/char/tpm/tpm2-cmd.c
>>> +++ b/drivers/char/tpm/tpm2-cmd.c
>>> @@ -908,9 +908,6 @@ static ssize_t tpm2_get_pcr_allocation(struct tpm_chip *chip)
>>> }
>>>
>>> out:
>>> - if (i < ARRAY_SIZE(chip->active_banks))
>>> - chip->active_banks[i] = TPM2_ALG_ERROR;
>>> -
>>> tpm_buf_destroy(&buf);
>>>
>>> return rc;
>>
>

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Managing Director: Bo PENG, Jian LI, Yanli SHI

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