From: Lino Sanfilippo <LinoSanfilippo@gmx.de>
To: Jarkko Sakkinen <jarkko@kernel.org>
Cc: peterhuewe@gmx.de, jgg@ziepe.ca, stefanb@linux.vnet.ibm.com,
James.Bottomley@hansenpartnership.com, keescook@chromium.org,
jsnitsel@redhat.com, ml.linux@elloe.vision,
linux-integrity@vger.kernel.org, linux-kernel@vger.kernel.org,
Stefan Berger <stefanb@linux.ibm.com>
Subject: Re: [PATCH v3 1/4] tpm: Use a threaded interrupt handler
Date: Wed, 5 May 2021 00:54:37 +0200 [thread overview]
Message-ID: <1364a268-7173-7253-543e-792ff2104e98@gmx.de> (raw)
In-Reply-To: <YJATRNMqzyAprCbL@kernel.org>
Hi,
On 03.05.21 at 17:14, Jarkko Sakkinen wrote:
> On Sat, May 01, 2021 at 03:57:24PM +0200, Lino Sanfilippo wrote:
>> The interrupt handler uses tpm_tis_read32() and tpm_tis_write32() to access
>> the interrupt status register. In case of SPI those accesses are done with
>> the spi_bus_lock mutex held. This means that the status register cannot
>> be read or written in interrupt context.
>>
>> For this reason request a threaded interrupt handler so that the required
>> accesses can be done in process context.
>>
>> Reviewed-by: Stefan Berger <stefanb@linux.ibm.com>
>> Signed-off-by: Lino Sanfilippo <LinoSanfilippo@gmx.de>
>
> No fixes tag.
>
> The short summary scopes now the whole TPM subsystem ("tpm:"), but the fix
> is targetted *only* for tpm_tis_spi. How about "tpm, tpm_tis_spi: Allow to
> sleep in the interrupt handler"?
>
> This also changes the semantics tpm_tis_*, not just tpm_tis_spi, which is
> not acceptable. We cannot backport a fix like this.
>
> Probably you should just add a parameter to tpm_tis_core_init() to hint
> that threaded IRQ is required, and then only conditionally do so.
>
Sure, this is doable although to be honest I dont see the issue with also the
non-SPI code running in the threaded interrupt handler. The functionality should
not change (especially since interrupts are not even working right now) and it would
save us a special treatment of the SPI case.
Regards,
Lino
next prev parent reply other threads:[~2021-05-04 22:54 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-01 13:57 [PATCH v3 0/4] Fixes for TPM interrupt handling Lino Sanfilippo
2021-05-01 13:57 ` [PATCH v3 1/4] tpm: Use a threaded interrupt handler Lino Sanfilippo
2021-05-03 15:14 ` Jarkko Sakkinen
2021-05-04 22:54 ` Lino Sanfilippo [this message]
2021-05-06 1:46 ` Jarkko Sakkinen
2021-05-01 13:57 ` [PATCH v3 2/4] tpm: Simplify locality handling Lino Sanfilippo
2021-05-03 15:50 ` Jarkko Sakkinen
2021-05-04 23:15 ` Lino Sanfilippo
2021-05-06 1:47 ` Jarkko Sakkinen
2022-03-24 17:04 ` [PATCH v3 0/4] Fixes for TPM interrupt handling Michael Niewöhner
2022-03-25 2:14 ` Jarkko Sakkinen
2022-03-25 12:32 ` Michael Niewöhner
2022-03-26 3:24 ` Lino Sanfilippo
2022-03-26 8:59 ` Michael Niewöhner
2022-03-30 15:19 ` Jarkko Sakkinen
2022-04-20 5:30 ` Jarkko Sakkinen
2022-04-20 5:32 ` Jarkko Sakkinen
2022-04-24 2:22 ` Lino Sanfilippo
2022-04-25 13:57 ` Jarkko Sakkinen
2022-03-30 15:18 ` Jarkko Sakkinen
2021-05-01 13:57 ` [PATCH v3 3/4] tpm: Fix test for interrupts Lino Sanfilippo
2021-05-03 15:52 ` Jarkko Sakkinen
2021-05-04 23:18 ` Lino Sanfilippo
2021-05-01 13:57 ` [PATCH v3 4/4] tpm: Only enable supported irqs Lino Sanfilippo
2021-05-01 19:09 ` Stefan Berger
2021-05-02 3:15 ` Lino Sanfilippo
2021-05-03 15:52 ` Jarkko Sakkinen
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