From: Omar Sandoval <osandov@osandov.com>
To: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Cc: Peter Huewe <peterhuewe@gmx.de>, Jason Gunthorpe <jgg@ziepe.ca>,
linux-integrity@vger.kernel.org
Subject: Re: [PATCH] tpm_tis: work around status register bug in STMicroelectronics TPM
Date: Thu, 16 Apr 2020 11:54:33 -0700 [thread overview]
Message-ID: <20200416185433.GA701157@vader> (raw)
In-Reply-To: <20200416170810.GD199110@linux.intel.com>
On Thu, Apr 16, 2020 at 08:08:10PM +0300, Jarkko Sakkinen wrote:
> On Wed, Apr 15, 2020 at 03:45:22PM -0700, Omar Sandoval wrote:
> > From: Omar Sandoval <osandov@fb.com>
> >
> > We've encountered a particular model of STMicroelectronics TPM that
> > transiently returns a bad value in the status register. This causes the
> > kernel to believe that the TPM is ready to receive a command when it
> > actually isn't, which in turn causes the send to time out in
> > get_burstcount(). In testing, reading the status register one extra time
> > convinces the TPM to return a valid value.
> >
> > Signed-off-by: Omar Sandoval <osandov@fb.com>
>
> So what is the bad value?
0xff. Sorry, I thought it would be clear from the code and comment in
the patch itself. Would you prefer for me to repeat it in the commit
message?
next prev parent reply other threads:[~2020-04-16 18:54 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-15 22:45 [PATCH] tpm_tis: work around status register bug in STMicroelectronics TPM Omar Sandoval
2020-04-15 23:51 ` James Bottomley
2020-04-16 0:16 ` Omar Sandoval
2020-04-16 0:24 ` Omar Sandoval
2020-04-16 18:02 ` James Bottomley
2020-04-17 23:55 ` Jarkko Sakkinen
2020-04-18 0:12 ` James Bottomley
2020-04-20 20:46 ` Jarkko Sakkinen
2020-04-20 22:28 ` James Bottomley
2020-04-21 14:36 ` Mimi Zohar
2020-04-21 20:25 ` Jarkko Sakkinen
2020-04-21 20:31 ` Mimi Zohar
2020-04-21 20:23 ` Jarkko Sakkinen
2020-04-21 22:08 ` James Bottomley
2020-04-16 17:09 ` Jarkko Sakkinen
2020-04-16 17:56 ` James Bottomley
2020-08-27 15:24 ` Jason Andryuk
2020-08-28 23:18 ` Jarkko Sakkinen
2020-08-29 0:12 ` Jason Andryuk
2020-08-31 13:55 ` Jarkko Sakkinen
2020-09-04 12:03 ` Jarkko Sakkinen
2020-04-16 17:08 ` Jarkko Sakkinen
2020-04-16 18:54 ` Omar Sandoval [this message]
2020-04-17 23:54 ` Jarkko Sakkinen
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