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From: Jarkko Sakkinen <jarkko@kernel.org>
To: Stefan Berger <stefanb@linux.ibm.com>
Cc: Stefan Berger <stefanb@linux.vnet.ibm.com>,
	peterhuewe@gmx.de, jgg@ziepe.ca, linux-integrity@vger.kernel.org,
	linux-security-module@vger.kernel.org,
	linux-kernel@vger.kernel.org, Nayna Jain <nayna@linux.ibm.com>,
	George Wilson <gcwilson@linux.ibm.com>,
	Nageswara R Sastry <rnsastry@linux.ibm.com>
Subject: Re: [PATCH] tpm: ibmvtpm: Avoid error message when process gets signal while waiting
Date: Thu, 29 Jul 2021 00:50:33 +0300	[thread overview]
Message-ID: <20210728215033.dhnekvksekalhcrn@kernel.org> (raw)
In-Reply-To: <ad4011fb-fc1f-4019-9856-7d171db3255c@linux.ibm.com>

On Mon, Jul 26, 2021 at 11:00:51PM -0400, Stefan Berger wrote:
> 
> On 7/26/21 10:42 PM, Jarkko Sakkinen wrote:
> > On Mon, Jul 12, 2021 at 12:25:05PM -0400, Stefan Berger wrote:
> > > From: Stefan Berger <stefanb@linux.ibm.com>
> > > 
> > > When rngd is run as root then lots of these types of message will appear
> > > in the kernel log if the TPM has been configure to provide random bytes:
> > > 
> > > [ 7406.275163] tpm tpm0: tpm_transmit: tpm_recv: error -4
> > > 
> > > The issue is caused by the following call that is interrupted while
> > > waiting for the TPM's response.
> > > 
> > > sig = wait_event_interruptible(ibmvtpm->wq,
> > >                                 !ibmvtpm->tpm_processing_cmd);
> > > 
> > > The solution is to use wait_event() instead.
> > Why?
> 
> So it becomes uninterruptible and these error messages go away.

We do not want to make a process uninterruptible. That would prevent
killing it.

/Jarkko

  reply	other threads:[~2021-07-28 21:50 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-12 16:25 Stefan Berger
2021-07-13  5:03 ` Nageswara Sastry
2021-07-27  2:42 ` Jarkko Sakkinen
2021-07-27  3:00   ` Stefan Berger
2021-07-28 21:50     ` Jarkko Sakkinen [this message]
2021-07-29 13:39       ` Stefan Berger
2021-07-30  0:57         ` Jarkko Sakkinen
2021-07-30 11:45           ` Stefan Berger
2021-07-29 16:19 Stefan Berger
2021-07-30  4:15 ` Nageswara Sastry

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