linux-kernel - Re: tpm-correct-tpm-timeouts-to-jiffies-conversion.patch -> 2.6.27

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Date:	Thu, 11 Sep 2008 12:03:52 +0200
From:	"Marcin Obara" <marcin_obara@...rs.sourceforge.net>
To:	"Andrew Morton" <akpm@...ux-foundation.org>
Cc:	"Jiri Slaby" <jirislaby@...il.com>, tpm@...horst.net,
	kjhall@...ibm.com, linux-kernel@...r.kernel.org,
	srajiv@...ux.vnet.ibm.com, debora@...ux.vnet.ibm.com
Subject: Re: tpm-correct-tpm-timeouts-to-jiffies-conversion.patch -> 2.6.27

2008/9/11 Andrew Morton <akpm@...ux-foundation.org>:
> On Thu, 11 Sep 2008 00:11:37 +0200
> Jiri Slaby <jirislaby@...il.com> wrote:
>
>> Hi,
>>
>> is it possible to push
>> tpm-correct-tpm-timeouts-to-jiffies-conversion.patch
>> (the patch header follows) into 2.6.27, please?
>
> Sure.
>
>> From: Marcin Obara <marcin_obara@...rs.sourceforge.net>
>>
>> This patch fixes timeouts conversion to jiffies, by replacing
>> msecs_to_jiffies() calls with usecs_to_jiffies().  According to TCG TPM
>> Specification Version 1.2 Revision 103 (pages 166, 167) TPM timeouts and
>> durations are returned in microseconds (usec) not in miliseconds (msec).
>>
>> Signed-off-by: Marcin Obara <marcin_obara@...rs.sourceforge.net>
>> Cc: Marcel Selhorst <tpm@...horst.net>
>> Cc: Kylene Jo Hall <kjhall@...ibm.com>
>> Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
>
> Why?  I wasn't aware that this fixed anything which anyone had observed
> (pokes tongue out at the changelog).
>

This fixes i.e.: long hang while loading TPM driver, if TPM chip
starts in "Idle" state instead of "Ready" state.
Without this patch - 'modprobe' may hang for 30 seconds or more.
Please, push this patch into 2.6.27.

Marcin
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