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

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Message-ID: <54231E52.2030501@linux.vnet.ibm.com>
Date:	Wed, 24 Sep 2014 15:41:06 -0400
From:	Stefan Berger <stefanb@...ux.vnet.ibm.com>
To:	Scot Doyle <lkml14@...tdoyle.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 09/24/2014 03:38 PM, Scot Doyle wrote:
> 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;
> }
>
Yes, this should be sufficient.

     Stefan

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