linux-kernel - [Fwd: Re: [PATCH] tpm: interrupt clear fix]

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Message-Id: <1153161320.4808.11.camel@localhost.localdomain>
Date:	Mon, 17 Jul 2006 11:35:20 -0700
From:	Kylene Jo Hall <kjhall@...ibm.com>
To:	stable@...nel.org
Cc:	Greg KH <gregkh@...e.de>, torvalds@...l.org, akpm@...l.org,
	"Theodore Ts'o" <tytso@....edu>,
	Zwane Mwaikambo <zwane@....linux.org.uk>,
	Justin Forbes <jmforbes@...uxtx.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Chris Wedgwood <reviews@...cw.f00f.org>,
	Randy Dunlap <rdunlap@...otime.net>,
	Dave Jones <davej@...hat.com>,
	Chuck Wolber <chuckw@...ntumlinux.com>, stable@...nel.org,
	alan@...rguk.ukuu.org.uk, greg@...ah.com
Subject: [Fwd: Re: [PATCH] tpm: interrupt clear fix]

-------- Forwarded Message --------
From: Kylene Jo Hall <kjhall@...ibm.com>
To: linux-os (Dick Johnson) <linux-os@...logic.com>
Cc: linux-kernel <linux-kernel@...r.kernel.org>, TPM Device Driver List
<tpmdd-devel@...ts.sourceforge.net>, akpm@...l.org
Subject: Re: [PATCH] tpm: interrupt clear fix
Date: Thu, 13 Jul 2006 12:24:36 -0700
Under stress testing I found that the interrupt is not always cleared.
This is a bug and this patch should go into 2.6.18 and 2.6.17.x.

On Thu, 2006-07-13 at 07:45 -0400, linux-os (Dick Johnson) wrote:

> PCI devices need a final read to flush all pending writes. Whatever
> mb() does, just hides the problem.


Signed-off-by: Kylene Hall <kjhall@...ibm.com>
---

--- linux-2.6.18-rc1/drivers/char/tpm/tpm_tis.c	2006-07-13 14:46:39.727500500 -0500
+++ linux-2.6.18-rc1-tpm/drivers/char/tpm/tpm_tis.c	2006-07-13 14:47:33.878884750 -0500
@@ -424,6 +424,7 @@ static irqreturn_t tis_int_handler(int i
 	iowrite32(interrupt,
 		  chip->vendor.iobase +
 		  TPM_INT_STATUS(chip->vendor.locality));
+	ioread32(chip->vendor.iobase + TPM_INT_STATUS(chip->vendor.locality));
 	return IRQ_HANDLED;
 }
 


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