Messages in this thread | | | Date | Sun, 15 Jan 2012 21:27:07 -0500 | From | Stefan Berger <> | Subject | Re: [Regression] Commit "tpm: Introduce function to poll for result of self test" breaks suspend |
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On 01/15/2012 06:22 PM, Rafael J. Wysocki wrote: > Hi Stefan, > Hi Rafael, > Unfortunately, the following commit from you: > > commit 68d6e6713fcb2ea6278661aaaf5f1c9c821b3751 > Author: Stefan Berger<stefanb@linux.vnet.ibm.com> > Date: Fri Nov 11 12:57:04 2011 -0500 > > tpm: Introduce function to poll for result of self test > > This patch introduces a function that runs the TPM_ContinueSelfTest() > function and then polls the TPM to check whether it finished the selftest > and can receive new commands. > > Signed-off-by: Stefan Berger<stefanb@linux.vnet.ibm.com> > > broke suspend on my Toshiba Portege R500. It causes the tpm driver to > return an error code from .suspend() on every attempt to suspend the system. >
Can you show what the error output is? Strange enough this function is not called during a suspend but during boot and again during resume. Can you try the following after a boot
cd /sys/devices find -name pcrs | xargs cat
and see whether this displays 24 PCRs. This sends a couple of commands to the TPM. Then try a suspend. Did this help anything? If yes, can you run above commands again?
FYI: TPM_ContinueSelfTest is the only TPM function that triggers an asynchronous action of the TPM, here the continuation of its self test. To prevent subsequent commands sent to the TPM from failing due to the ongoing self test, we are now waiting for this command to finish. None of the machines that I tested it with had a TPM that actually did anything during the TPM_ContinueSelfTest() but must have fully completed their selftest during TPM_SelfTest() sent to it by the BIOS.
> Revertig this commit on top of the current Linus' tree fixes the problem for me. > > If necessary, I'll collect more information about this problem tomorrow.
The output of 'caps' would be interesting in the same dir as pcrs:
cd /sys/devices find -name caps | xargs cat
Stefan
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