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SubjectRe: [PATCH v11 00/16] Remove nested TPM operations
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On 08.02.2019 03:14, Stefan Berger wrote:
> On 2/7/19 8:51 PM, Stefan Berger wrote:
>> On 2/7/19 7:33 PM, Jarkko Sakkinen wrote:
>>> On Thu, Feb 07, 2019 at 06:29:43PM -0500, Stefan Berger wrote:
>>>> On 2/7/19 4:29 PM, Jarkko Sakkinen wrote:
>>
>>
>>>
>>>> diff --git a/drivers/char/tpm/tpm2-cmd.c b/drivers/char/tpm/tpm2-cmd.c
>>>> index e74c5b7b64bf..52afe20cc8a1 100644
>>>> --- a/drivers/char/tpm/tpm2-cmd.c
>>>> +++ b/drivers/char/tpm/tpm2-cmd.c
>>>> @@ -799,7 +799,9 @@ int tpm2_probe(struct tpm_chip *chip)
>>>>       tpm_buf_append_u32(&buf, TPM2_CAP_TPM_PROPERTIES);
>>>>       tpm_buf_append_u32(&buf, TPM_PT_TOTAL_COMMANDS);
>>>>       tpm_buf_append_u32(&buf, 1);
>>>> +    tpm_chip_start(chip);
>>>>       rc = tpm_transmit_cmd(chip, &buf, 0, NULL);
>>>> +    tpm_chip_stop(chip);
>>> Thanks Stefan! I added call to tpm_tis_core as tpm2-cmd.c is to be kept
>>> out of chip management common case being that you call
>>> tpm_try_get_ops(),
>>> do 1-N TPM commands and release with tpm_put_ops(). These functions take
>>> care starting and stopping the chip.
>>>
>>> I fixed the 2nd issue in the master.
>>
>> You also need to export the tpm_chip_start/stop symbols.
>>
>>
>> Master now seems to (still) have a problem when rmmod'ing:
>>
>> A TPM error (325) occurred stopping the TPM. This happens at the same
>> patch where I had to add the tpm_chip_start/stop above.
>>
>>
>
> Here's my current overall patch against your master. I suppose the other
> tpm2_shutdown() for power management doesn't need the chip start ?
>
> diff --git a/drivers/char/tpm/tpm-chip.c b/drivers/char/tpm/tpm-chip.c
> index 9865776ee2cd..f7147706a9c3 100644
> --- a/drivers/char/tpm/tpm-chip.c
> +++ b/drivers/char/tpm/tpm-chip.c
> @@ -115,6 +115,7 @@ int tpm_chip_start(struct tpm_chip *chip)
>
>      return 0;
>  }
> +EXPORT_SYMBOL_GPL(tpm_chip_start);
>
>  /**
>   * tpm_chip_stop() - power off the TPM
> @@ -131,7 +132,7 @@ void tpm_chip_stop(struct tpm_chip *chip)
>      if (chip->ops->clk_enable)
>          chip->ops->clk_enable(chip, false);
>  }
> -
> +EXPORT_SYMBOL_GPL(tpm_chip_stop);
>
>  /**
>   * tpm_try_get_ops() - Get a ref to the tpm_chip
> @@ -474,8 +475,11 @@ static void tpm_del_char_device(struct tpm_chip *chip)
>
>      /* Make the driver uncallable. */
>      down_write(&chip->ops_sem);
> -    if (chip->flags & TPM_CHIP_FLAG_TPM2)
> +    if (chip->flags & TPM_CHIP_FLAG_TPM2) {
> +        tpm_chip_start(chip, 0);
>          tpm2_shutdown(chip, TPM2_SU_CLEAR);
> +        tpm_chip_stop(chip, 0);
> +    }
>      chip->ops = NULL;
>      up_write(&chip->ops_sem);
>  }
> diff --git a/drivers/char/tpm/tpm-interface.c
> b/drivers/char/tpm/tpm-interface.c
> index 02e8cffd1163..fcd845ad8c3c 100644
> --- a/drivers/char/tpm/tpm-interface.c
> +++ b/drivers/char/tpm/tpm-interface.c
> @@ -124,6 +124,8 @@ static ssize_t tpm_try_transmit(struct tpm_chip
> *chip, void *buf, size_t bufsiz)
>          dev_err(&chip->dev, "tpm_transmit: tpm_recv: error %d\n", rc);
>      } else if (len < TPM_HEADER_SIZE || len !=
> be32_to_cpu(header->length))
>          rc = -EFAULT;
> +    else
> +        rc = 0;
>
>      return rc ? rc : len;
>  }

Applying those changes fixes all the issues I saw, thanks. I'll retest
Jarkko's tree without custom patches, once you've agreed on the rc question.

Alexander

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