linux-kernel - Re: [PATCH v9] tpm_tis: verify interrupt during init

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Message-ID: <alpine.DEB.2.11.1409241936270.3152@localhost.localdomain>
Date:	Wed, 24 Sep 2014 19:38:55 +0000 (UTC)
From:	Scot Doyle <lkml14@...tdoyle.com>
To:	Stefan Berger <stefanb@...ux.vnet.ibm.com>
cc:	Peter Huewe <peterhuewe@....de>, Ashley Lai <ashley@...leylai.com>,
	Marcel Selhorst <tpmdd@...horst.net>,
	Jason Gunthorpe <jgunthorpe@...idianresearch.com>,
	Luigi Semenzato <semenzato@...gle.com>,
	Michael Mullin <masmullin@...il.com>,
	linux-kernel@...r.kernel.org, tpmdd-devel@...ts.sourceforge.net
Subject: Re: [PATCH v9] tpm_tis: verify interrupt during init

On Tue, 23 Sep 2014, Stefan Berger wrote:
> On 09/23/2014 07:55 AM, Scot Doyle wrote:
>> On Tue, 23 Sep 2014, Scot Doyle wrote:
>> +static void disable_interrupts(struct tpm_chip *chip)
>> +{
>> +	u32 intmask;
>> +	intmask =
>> +	    ioread32(chip->vendor.iobase +
>> +		     TPM_INT_ENABLE(chip->vendor.locality));
>> +	intmask |= TPM_INTF_CMD_READY_INT | TPM_INTF_LOCALITY_CHANGE_INT |
>> +		   TPM_INTF_DATA_AVAIL_INT | TPM_INTF_STS_VALID_INT;
>
> You want to disable interrupts but you set all the flags? Maybe you meant:
>
> intmask &= ~(FOO|BAR)
>
> ?

Thanks, would this work? I think it's how tpm_tis_init masks during a probe.

static void disable_interrupts(struct tpm_chip *chip)
{
	u32 intmask;
	intmask =
	    ioread32(chip->vendor.iobase +
		     TPM_INT_ENABLE(chip->vendor.locality));
	intmask &= ~TPM_GLOBAL_INT_ENABLE;
	iowrite32(intmask,
		  chip->vendor.iobase +
		  TPM_INT_ENABLE(chip->vendor.locality));
	free_irq(chip->vendor.irq, chip);
	chip->vendor.irq = 0;
}

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