On Thu, 2017-05-25 at 17:39 -0400, Stefan Berger wrote:
> Suppress the error logging when the core TPM driver sends commands
> to the VTPM proxy driver and -EPIPE is returned in case the VTPM
> proxy driver is 'closed' (closed anonymous file descriptor).  This
> error code is only returned by the send function and by tpm_transmit
> when the VTPM proxy driver is being used.
> 
> Signed-off-by: Stefan Berger <[email protected]>
> ---
>  drivers/char/tpm/tpm-interface.c | 4 ++--
>  drivers/char/tpm/tpm2-cmd.c      | 2 +-
>  2 files changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/char/tpm/tpm-interface.c 
> b/drivers/char/tpm/tpm-interface.c
> index d711186..4826fcf 100644
> --- a/drivers/char/tpm/tpm-interface.c
> +++ b/drivers/char/tpm/tpm-interface.c
> @@ -429,11 +429,11 @@ ssize_t tpm_transmit(struct tpm_chip *chip, struct 
> tpm_space *space,
>               goto out;
>  
>       rc = chip->ops->send(chip, (u8 *) buf, count);
> -     if (rc < 0) {
> +     if (rc < 0 && rc != -EPIPE)
>               dev_err(&chip->dev,
>                       "tpm_transmit: tpm_send: error %d\n", rc);
> +     if (rc < 0)
>               goto out;

Perhaps this would read better as

        if (rc < 0) {
                if (rc != -EPIPE)
                        dev_err(etc...);
                goto out;
        }

though for etc, perhaps
                        dev_err(&chip->dev, "%s: %tpm_send: error %d\n",
                                __func__, rc);

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