linux-kernel - Re: question about setting TPM_CHIP_FLAG_IRQ in tpm_tis_core

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Date:   Fri, 15 Nov 2019 12:14:49 -0700
From:   Jerry Snitselaar <jsnitsel@...hat.com>
To:     Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
Cc:     Stefan Berger <stefanb@...ux.ibm.com>,
        linux-integrity@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: question about setting TPM_CHIP_FLAG_IRQ in tpm_tis_core_init

On Tue Nov 12 19, Jarkko Sakkinen wrote:
>On Tue, Nov 12, 2019 at 08:28:57AM -0500, Stefan Berger wrote:
>> I set this flag for the TIS because it wasn't set anywhere else.
>> tpm_tis_send() wouldn't set the flag but go via the path:
>>
>> if (!(chip->flags & TPM_CHIP_FLAG_IRQ) || priv->irq_tested)
>>
>>         return tpm_tis_send_main(chip, buf, len);
>
>Wondering why this isn't just "if (priv->irq_tested)"? Isn't that the
>whole point. The tail is the test part e.g. should be executed when
>IRQ testing is done.
>
>/Jarkko
>

I wonder if it would make sense to rename tpm_tis_send_main to tpm_tis_send,
move the irq testing bits from the current tpm_tis_send to tpm_tis_gen_interrupt,
and have tpm_tis_gen_interrupt build its own tpmbufs to send via tpm_tis_send
for the testing. Have all the irq testing bits are off on their own and separated out
from sending commands.