linux-kernel - [REGRESSION] tpm_tis on Lenovo T410 broken in 2.6.38-rc6

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Message-Id: <E1PuRS4-0001rO-DS@tytso-glaptop>
Date:	Tue, 01 Mar 2011 10:25:28 -0500
From:	"Theodore Ts'o" <tytso@....edu>
To:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Rajiv Andrade <srajiv@...ux.vnet.ibm.com>,
	James Morris <jmorris@...ei.org>
Cc:	linux-kernel@...r.kernel.org
Subject: [REGRESSION] tpm_tis on Lenovo T410 broken in 2.6.38-rc6

TPM is working for me so I can log into employer's network in 2.6.37.
It broke when I tried 2.6.38-rc6, with the following relevant lines from
my dmesg:

[   11.081627] tpm_tis 00:0b: 1.2 TPM (device-id 0x0, rev-id 78)
[   25.734114] tpm_tis 00:0b: Operation Timed out
[   78.040949] tpm_tis 00:0b: Operation Timed out

This caused me to get suspicious, especially since the _other_ TPM
commit in 2.6.38 had already been reverted, so I tried reverting commit
c4ff4b829e: "TPM: Long default timeout fix".   With this commit
reverted, my TPM on my Lenovo T410 is once again working.

Given how late we are in the 2.6.38-rc cycle, maybe we should revert
this commit in Linus's tree?

                                                - Ted
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