linux-kernel - RE: [tpmdd-devel] [PATCH] TPM: Issue TPM_STARTUP at driver load if the TPM has not been started

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Message-ID: <74A44E99E3274B4CB570415926B37D440EAA91@MUCSE501.eu.infineon.com>
Date:	Mon, 1 Oct 2012 09:17:28 +0000
From:	<Peter.Huewe@...ineon.com>
To:	<jgunthorpe@...idianresearch.com>, <linux-kernel@...r.kernel.org>,
	<tpmdd-devel@...ts.sourceforge.net>
Subject: RE: [tpmdd-devel] [PATCH] TPM: Issue TPM_STARTUP at driver load if
 the TPM has not been started

Hi Jason,

> The TPM will respond to TPM_GET_CAP with TPM_ERR_INVALID_POSTINIT if
> TPM_STARTUP has not been issued. This will result in the TPM driver
> failing to load and no way to recover. Detect this and automatically
> issue TPM_STARTUP.

> This is for embedded applications where the kernel is the first thing
> to touch the TPM.

Thanks for working on this.
I also thought about this scenario quite often.

Shouldn't we then also add a TpmStartup(ST_STATE) in case of a resume?
 rc=GetCapability()
 if(rc==INVALID_POSTINIT)
 	tpm_transmit ("TPM_STARTUP(ST_STATE)")...

Thanks,
Peter
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