Re: [PATCH v3 03/16] tpm: return 0 from pcrs_show() when tpm1_pcr_read() fails

[Jarkko Sakkinen]

On Mon, Nov 05, 2018 at 04:54:52PM -0500, Stefan Berger wrote:
> On 11/4/18 8:45 PM, Jarkko Sakkinen wrote:
> > Do not print partial list of PCRs when tpm1_pcr_read() fails but instead
> > return 0 from pcrs_show(). This is consistent behavior with other sysfs
> > functions.
> > 
> > Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@xxxxxxxxxxxxxxx>
> > ---
> >   drivers/char/tpm/tpm-sysfs.c | 6 ++++--
> >   1 file changed, 4 insertions(+), 2 deletions(-)
> > 
> > diff --git a/drivers/char/tpm/tpm-sysfs.c b/drivers/char/tpm/tpm-sysfs.c
> > index 7ed7eb6f906a..d3b05c7526c8 100644
> > --- a/drivers/char/tpm/tpm-sysfs.c
> > +++ b/drivers/char/tpm/tpm-sysfs.c
> > @@ -115,13 +115,15 @@ static ssize_t pcrs_show(struct device *dev, struct device_attribute *attr,
> >   	for (i = 0; i < num_pcrs; i++) {
> >   		rc = tpm1_pcr_read(chip, i, digest);
> >   		if (rc)
> > -			break;
> > +			goto out;
> 
> Previous patch said "Return zero when tpm_buf_init() fails as we do for
> other functions in tpm-sysfs.c.". Why not return 0 in this case as well?

Yes, good catch, thank you.

/Jarkko