Re: [PATCH] tpm: interrupt clear fix

["linux-os \(Dick Johnson\)" <linux-os@analogic.com>]

On Wed, 12 Jul 2006, Kylene Jo Hall wrote:

> 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.
>
> Signed-off-by: Kylene Hall <kjhall@us.ibm.com>
> ---
> --- tcg/tpmdd/drivers/char/tpm/tpm_tis.c	2006-06-07 11:37:08.000000000 -0700
> +++ linux-2.6.17/drivers/char/tpm/tpm_tis.c	2006-07-10 12:58:28.000000000 -0700
> @@ -424,6 +424,7 @@ static irqreturn_t tis_int_handler(int i
> 	iowrite32(interrupt,
> 		  chip->vendor.iobase +
> 		  TPM_INT_STATUS(chip->vendor.locality));
> +	mb();
> 	return IRQ_HANDLED;
> }

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

Cheers,
Dick Johnson
Penguin : Linux version 2.6.16.24 on an i686 machine (5592.63 BogoMips).
New book: http://www.AbominableFirebug.com/
_


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