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SubjectRe: [PATCH v3] tpm_tis: turn on TPM before calling tpm_get_timeouts
On Tue, Nov 12, 2019 at 05:02:43PM -0700, Jerry Snitselaar wrote:
> With power gating moved out of the tpm_transmit code we need
> to power on the TPM prior to calling tpm_get_timeouts.
>
> Cc: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
> Cc: Peter Huewe <peterhuewe@gmx.de>
> Cc: Jason Gunthorpe <jgg@ziepe.ca>
> Cc: linux-kernel@vger.kernel.org
> Cc: stable@vger.kernel.org
> Fixes: a3fbfae82b4c ("tpm: take TPM chip power gating out of tpm_transmit()")
> Reported-by: Christian Bundy <christianbundy@fraction.io>
> Signed-off-by: Jerry Snitselaar <jsnitsel@redhat.com>
> ---
> v3: call tpm_chip_stop in error path
> v2: fix stable cc to correct address
>
> drivers/char/tpm/tpm_tis_core.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/char/tpm/tpm_tis_core.c b/drivers/char/tpm/tpm_tis_core.c
> index 270f43acbb77..806acc666696 100644
> --- a/drivers/char/tpm/tpm_tis_core.c
> +++ b/drivers/char/tpm/tpm_tis_core.c
> @@ -974,13 +974,14 @@ int tpm_tis_core_init(struct device *dev, struct tpm_tis_data *priv, int irq,
> * to make sure it works. May as well use that command to set the
> * proper timeouts for the driver.
> */
> + tpm_chip_start(chip);
> if (tpm_get_timeouts(chip)) {
> dev_err(dev, "Could not get TPM timeouts and durations\n");
> rc = -ENODEV;
> + tpm_chip_stop(chip);
> goto out_err;
> }
>
> - tpm_chip_start(chip);

As the commit describes the call is not there for any other reason than
pinging the TPM.

/Jarkko

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