On Wed, Oct 26, 2016 at 11:01:00PM +0530, Nayna wrote:
>
>
> On 10/26/2016 04:26 PM, Jarkko Sakkinen wrote:
> > On Wed, Oct 26, 2016 at 07:52:53AM +0530, Nayna wrote:
> > >
> > >
> > > On 10/21/2016 08:32 PM, Jarkko Sakkinen wrote:
> > > > On Fri, Oct 21, 2016 at 08:52:14AM +0530, Nayna wrote:
> > > > >
> > > > >
> > > > > On 10/20/2016 04:54 PM, Jarkko Sakkinen wrote:
> > > > > > On Thu, Oct 20, 2016 at 07:34:37AM +0000, Winkler, Tomas wrote:
> > > > > > > > On Tue, Oct 18, 2016 at 08:49:45PM -0400, Nayna Jain wrote:
> > > > > > > > > This patch removes the unnecessary error messages on failing
> > > > > > > > > to
> > > > > > > > > allocate memory and replaces pr_err/printk with
> > > > > > > > > dev_dbg/dev_info as
> > > > > > > > > applicable.
> > > > > > > > >
> > > > > > > > > Suggested-by: Jason Gunthorpe
> > > > > > > > > <jguntho...@obsidianresearch.com>
> > > > > > > > > Signed-off-by: Nayna Jain <na...@linux.vnet.ibm.com>
> > > > > > > >
> > > > > > > > Reviewed-by: Jarkko Sakkinen <jarkko.sakki...@linux.intel.com>
> > > > > > > >
> > > > > > > > /Jarkko
> > > > > > > >
> > > > > > > > > ---
> > > > > > > > > drivers/char/tpm/tpm_acpi.c | 17 +++++------------
> > > > > > > > > drivers/char/tpm/tpm_of.c | 30
> > > > > > > > > ++++++++++--------------------
> > > > > > > > > 2 files changed, 15 insertions(+), 32 deletions(-)
> > > > > > > > >
> > > > > > > > > diff --git a/drivers/char/tpm/tpm_acpi.c
> > > > > > > > > b/drivers/char/tpm/tpm_acpi.c
> > > > > > > > > index 859bdba..22e42da 100644
> > > > > > > > > --- a/drivers/char/tpm/tpm_acpi.c
> > > > > > > > > +++ b/drivers/char/tpm/tpm_acpi.c
> > > > > > > > > @@ -60,11 +60,8 @@ int read_log_acpi(struct tpm_chip *chip)
> > > > > > > > > status = acpi_get_table(ACPI_SIG_TCPA, 1,
> > > > > > > > > (struct acpi_table_header
> > > > > > > > > **)&buff);
> > > > > > > > >
> > > > > > > > > - if (ACPI_FAILURE(status)) {
> > > > > > > > > - printk(KERN_ERR "%s: ERROR - Could not get TCPA
> > > > > > > > > table\n",
> > > > > > > > > - __func__);
> > > > > > > > > + if (ACPI_FAILURE(status))
> > > > > > > > > return -EIO;
> > > > > > > > > - }
> > > > > > > > >
> > > > > > > > > switch(buff->platform_class) {
> > > > > > > > > case BIOS_SERVER:
> > > > > > > > > @@ -78,25 +75,21 @@ int read_log_acpi(struct tpm_chip *chip)
> > > > > > > > > break;
> > > > > > > > > }
> > > > > > > > > if (!len) {
> > > > > > > > > - printk(KERN_ERR "%s: ERROR - TCPA log area
> > > > > > > > > empty\n",
> > > > > > > > __func__);
> > > > > > > > > + dev_dbg(&chip->dev, "%s: ERROR - TCPA log area
> > > > > > > > > empty\n",
> > > > > > > > > + __func__);
> > > > > > >
> > > > > > >
> > > > > > > Why to keep __func__ here, dev_dbg already does it for you.
> > > > > >
> > > > > > Good catch. I would actually consider also changing this to
> > > > > >
> > > > > > dev_err(dev, FW_BUG "TCPA log area empty\n");
> > > > > >
> > > > > > If TCPA exists but it's empty, that's most likely a FW bug.
> > > > >
> > > > > If it can be possibly a FW bug, should it fail the probe also just
> > > > > like
> > > > > -ENOMEM error ?
> > > >
> > > > I think so but I hold for second opinion on this. I mean wouldn't
> > > > it seem like a bit broken situation where TCPA tabe would exist but
> > > > would also be empty?
> > >
> > > Hmm, is it possible for this to be firmware implementation dependent ?
> >
> > Let me put it this way. Why would anyone expose TCPA to the user space
> > that is empty? What would be the point?
>
> If I understand correctly, the reserved memory for event log would be
> allocated much earlier and firmware would directly write to this allocated
> memory. So, if there is a firmware bug, and events are not recorded, it will
> get exposed to userspace as empty event log and this might also help
> applications to know that it is broken. Is there any wrong assumption here
> ?
I think the right question to ask is can event log be legally empty?
If not, then FW_BUG should be used here.
/Jarkko
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