linux-kernel - [22/89] tpm_tis: add delay after aborting command

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Message-Id: <20120201210045.833017573@clark.kroah.org>
Date:	Wed, 01 Feb 2012 12:59:46 -0800
From:	Greg KH <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk,
	Stefan Berger <stefanb@...ux.vnet.ibm.com>,
	Rajiv Andrade <srajiv@...ux.vnet.ibm.com>
Subject: [22/89] tpm_tis: add delay after aborting command

3.2-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Stefan Berger <stefanb@...ux.vnet.ibm.com>

commit a927b8131794ee449b7f6666e7ab61301949b20f upstream.

This patch adds a delay after aborting a command. Some TPMs need
this and will not process the subsequent command correctly otherwise.

It's worth noting that a TPM randomly failing to process a command,
maps to randomly failing suspend/resume operations.

Signed-off-by: Stefan Berger <stefanb@...ux.vnet.ibm.com>
Signed-off-by: Rajiv Andrade <srajiv@...ux.vnet.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/char/tpm/tpm_tis.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/drivers/char/tpm/tpm_tis.c
+++ b/drivers/char/tpm/tpm_tis.c
@@ -432,6 +432,9 @@ static int probe_itpm(struct tpm_chip *c
 out:
 	itpm = rem_itpm;
 	tpm_tis_ready(chip);
+	/* some TPMs need a break here otherwise they will not work
+	 * correctly on the immediately subsequent command */
+	msleep(chip->vendor.timeout_b);
 	release_locality(chip, chip->vendor.locality, 0);
 
 	return rc;


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