Re: [tpmdd-devel] [PATCH v3 0/3] prepare for TPM 2.0

From: Jarkko Sakkinen
Date: Tue Oct 28 2014 - 02:01:14 EST


On Mon, Oct 27, 2014 at 04:30:48PM +0000, Scot Doyle wrote:
> Hi Jarkko, will you explain why the free_irq call was removed in
> tpm_tis_init around line 693?

Because irq is reserved with a devm_request_irq() call.

> I'm wondering if the free_irq call in disable_irq in
> https://lkml.org/lkml/2014/9/24/1179 should be removed since it's also
> invoked during tpm_tis_init.

Please, read

https://www.kernel.org/doc/Documentation/driver-model/devres.txt

/Jarkko

> On Mon, 27 Oct 2014, Jarkko Sakkinen wrote:
>
> > Hey,
> >
> > Any comments about this? In v2 I fixed issues reported by Jason
> > and in v3 fixed rather embarrasing one regression. Changes have
> > been now also tested to work just fine with the TIS driver.
> >
> > /Jarkko
> >
> > On Sun, Oct 26, 2014 at 11:13:54AM +0200, Jarkko Sakkinen wrote:
> > > This patch set fixes two race conditions in the TPM subsystem:
> > >
> > > * Two-phase initialization for struct tpm_chip so that device can
> > > initialize fully initialize before exposing itself to the user
> > > space. Also, in future TPM2 devices must be flagged before they
> > > can be registered.
> > > * Machines where there are two TPM devices exposed by ACPI have
> > > a racy lookup for the PPI interface. This patch set fixes this
> > > issues
> > >
> > > In addition, transmit_cmd() is renamed as tpm_transmit_cmd() and
> > > made opaque so that separate command structure can be introduced
> > > for TPM2.
> > >
> > > Comments about v1:
> > > * I think this could be pulled to 3.18 because this clearly fixes
> > > bugs in the current implementation.
> > >
> > > Changes since v1:
> > > * Removed dev_dbgs from tpm-chip.c
> > > * Use driver_lock for dev_mask (the problem was existing also in
> > > tpm-interface.c when the code was moved).
> > > * Check for bios_dir nullity when removed (the problem was existing
> > > also in tpm-interface.c when the code was moved).
> > > * Cleaned up the control flow in tpm_i2c_stm_st33.c and tpm_atmel.c.
> > > * Cleaned up the control flow in tpm_ppi.c.
> > >
> > > Comments about v2:
> > > * Thanks to Jason Gunthorpe for reviewing v1.
> > > * I'm at T2 infosec conference right now so I wasn't able to test the
> > > force paths in tpm_atmel.c and tpm_tis.c.
> > >
> > > Changes since v2:
> > > * Regression in tpm-dev.c, must use tpm_transmit() instead of
> > > tpm_transmit_cmd().
> > >
> > > Jarkko Sakkinen (3):
> > > tpm: merge duplicate transmit_cmd() functions
> > > tpm: two-phase chip management functions
> > > tpm: fix multiple race conditions in tpm_ppi.c
> > >
> > > drivers/char/tpm/Makefile | 2 +-
> > > drivers/char/tpm/tpm-chip.c | 196 +++++++++++++++++++++++++++++++++++
> > > drivers/char/tpm/tpm-interface.c | 197 +++++-------------------------------
> > > drivers/char/tpm/tpm-sysfs.c | 23 +----
> > > drivers/char/tpm/tpm.h | 30 ++++--
> > > drivers/char/tpm/tpm_atmel.c | 12 ++-
> > > drivers/char/tpm/tpm_i2c_atmel.c | 33 ++----
> > > drivers/char/tpm/tpm_i2c_infineon.c | 37 ++-----
> > > drivers/char/tpm/tpm_i2c_nuvoton.c | 44 +++-----
> > > drivers/char/tpm/tpm_i2c_stm_st33.c | 38 +++----
> > > drivers/char/tpm/tpm_ibmvtpm.c | 17 ++--
> > > drivers/char/tpm/tpm_infineon.c | 29 +++---
> > > drivers/char/tpm/tpm_nsc.c | 14 ++-
> > > drivers/char/tpm/tpm_ppi.c | 136 +++++++++++++++----------
> > > drivers/char/tpm/tpm_tis.c | 94 ++++++++---------
> > > drivers/char/tpm/xen-tpmfront.c | 14 +--
> > > 16 files changed, 467 insertions(+), 449 deletions(-)
> > > create mode 100644 drivers/char/tpm/tpm-chip.c
> > >
> > > --
> > > 2.1.0
> > >
> >
> > ------------------------------------------------------------------------------
> > _______________________________________________
> > tpmdd-devel mailing list
> > tpmdd-devel@xxxxxxxxxxxxxxxxxxxxx
> > https://lists.sourceforge.net/lists/listinfo/tpmdd-devel
> >
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