From: PrasannaKumar Muralidharan <prasannatsmkumar@gmail.com>
To: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
Cc: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>,
Stefan Berger <stefanb@linux.vnet.ibm.com>,
linux-integrity@vger.kernel.org,
David Howells <dhowells@redhat.com>,
Herbert Xu <herbert@gondor.apana.org.au>,
"open list:INTEGRITY MEASUREMENT ARCHITECTURE IMA"
<linux-ima-user@lists.sourceforge.net>,
Dmitry Kasatkin <dmitry.kasatkin@gmail.com>,
open list <linux-kernel@vger.kernel.org>,
linux-security-module@vger.kernel.org,
"moderated list:TPM DEVICE DRIVER"
<tpmdd-devel@lists.sourceforge.net>,
"open list:KEYS-TRUSTED" <keyrings@vger.kernel.org>,
"open list:HARDWARE RANDOM NUMBER GENERATOR CORE"
<linux-crypto@vger.kernel.org>,
James Morris <james.l.morris@oracle.com>,
Matt Mackall <mpm@selenic.com>open list:INTEGRITY MEASUREMENT
ARCHITECTURE IMA
Subject: Re: [tpmdd-devel] [PATCH] tpm: remove chip_num parameter from in-kernel API
Date: Tue, 24 Oct 2017 23:26:52 +0530 [thread overview]
Message-ID: <CANc+2y523PgF_-ynp2xuor_2RUGLFhnK14F-Wf5i5hwRDmk_Fw@mail.gmail.com> (raw)
In-Reply-To: <20171024174637.GB1806@obsidianresearch.com>
Hi Jason,
On 24 October 2017 at 23:16, Jason Gunthorpe
<jgunthorpe@obsidianresearch.com> wrote:
> On Tue, Oct 24, 2017 at 09:44:30PM +0530, PrasannaKumar Muralidharan wrote:
>
>> I am wondering why it is wrong. Isn't the chip id valid till it is
>> unregistered? If so the rfc is correct. Please explain, may be I am
>> missing something.
>
> The lifetime is a bit complicated, but the general rule in the kernel
> for things like this it to use pointers, not ids, and certainly not
> string ids.
>
> For that patch it could just use container_of to get the chip..
>
> Jason
hwrng requires a unique name for every device. In that patch
"tpm-rng-<chip_num>" is used. chip_num is nothing but dev->dev_num.
This way more than 1 tpm chip can be used as rng provider.
tpm_get_random uses chip_num as its parameter. This is why
chip->dev_num was used.
Is that reasoning correct?
Please feel free to correct me if I am wrong.
Thanks,
PrasannaKumar
next prev parent reply other threads:[~2017-10-24 17:56 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-10-23 12:38 [PATCH] tpm: remove chip_num parameter from in-kernel API Jarkko Sakkinen
2017-10-23 14:07 ` [tpmdd-devel] " Stefan Berger
2017-10-23 16:31 ` Jason Gunthorpe
2017-10-24 15:44 ` Jarkko Sakkinen
[not found] ` <20171024154440.3jeupmus43jcgbbz-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
2017-10-24 15:51 ` PrasannaKumar Muralidharan
2017-10-24 15:55 ` [tpmdd-devel] " Jason Gunthorpe
2017-10-24 16:07 ` PrasannaKumar Muralidharan
2017-10-24 16:11 ` Jason Gunthorpe
2017-10-24 16:14 ` PrasannaKumar Muralidharan
2017-10-24 17:46 ` Jason Gunthorpe
2017-10-24 17:56 ` PrasannaKumar Muralidharan [this message]
2017-10-24 17:02 ` Dmitry Torokhov
2017-10-24 17:37 ` Jason Gunthorpe
2017-10-24 17:44 ` PrasannaKumar Muralidharan
[not found] ` <20171024173757.GA1806-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2017-10-24 18:04 ` Dmitry Torokhov
2017-10-24 18:15 ` [tpmdd-devel] " Jarkko Sakkinen
[not found] ` <20171024181512.iaxtzgxexhki7aqr-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
2017-10-24 18:40 ` Peter Huewe
2017-10-24 16:23 ` [tpmdd-devel] " Jarkko Sakkinen
2017-10-24 16:35 ` PrasannaKumar Muralidharan
[not found] ` <CANc+2y4vtr+kbhC_7Rv=rHA2LgEVBHLFEu+DYYK1UmpU63PCgQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2017-10-24 18:22 ` Jarkko Sakkinen
[not found] ` <20171024182235.d7b3oajc5zcjs57v-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
2017-10-25 14:51 ` PrasannaKumar Muralidharan
2017-10-25 19:11 ` [tpmdd-devel] " Jarkko Sakkinen
2017-10-26 16:23 ` PrasannaKumar Muralidharan
2017-10-24 14:04 ` Jarkko Sakkinen
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