From: Jason Gunthorpe <jgunthorpe-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
To: Andrey Pronin <apronin-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org>
Cc: linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
semenzato-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org,
tpmdd-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org,
groeck-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org
Subject: Re: [PATCH] tpm/tpm_i2c_infineon: ensure no ongoing commands on shutdown
Date: Fri, 13 Jan 2017 17:28:57 -0700 [thread overview]
Message-ID: <20170114002857.GA5851@obsidianresearch.com> (raw)
In-Reply-To: <20170114000954.17728-1-apronin-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org>
On Fri, Jan 13, 2017 at 04:09:54PM -0800, Andrey Pronin wrote:
> Resetting TPM while processing a command may lead to issues
> on the next boot. Ensure that we don't have any ongoing
> commands, and that no further commands can be sent to the chip
> by unregistering the device in the shutdown handler.
> tpm_chip_unregister() waits for the completion of an ongoing
> command, if any, and then clears out chip->ops and unregisters
> sysfs entities.
Unregistering in a shutdown handler seems very strange, it also waits
for userspace things, so I wonder if it could be problematic?
Maybe just use
down_write(&chip->ops_sem);
chip->ops = NULL;
up_write(&chip->ops_sem);
In the shutdown handler?
Jason
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WARNING: multiple messages have this Message-ID (diff)
From: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
To: Andrey Pronin <apronin@chromium.org>
Cc: Peter Huewe <peterhuewe@gmx.de>,
Marcel Selhorst <tpmdd@selhorst.net>,
Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>,
tpmdd-devel@lists.sourceforge.net, linux-kernel@vger.kernel.org,
semenzato@chromium.org, groeck@chromium.org
Subject: Re: [PATCH] tpm/tpm_i2c_infineon: ensure no ongoing commands on shutdown
Date: Fri, 13 Jan 2017 17:28:57 -0700 [thread overview]
Message-ID: <20170114002857.GA5851@obsidianresearch.com> (raw)
In-Reply-To: <20170114000954.17728-1-apronin@chromium.org>
On Fri, Jan 13, 2017 at 04:09:54PM -0800, Andrey Pronin wrote:
> Resetting TPM while processing a command may lead to issues
> on the next boot. Ensure that we don't have any ongoing
> commands, and that no further commands can be sent to the chip
> by unregistering the device in the shutdown handler.
> tpm_chip_unregister() waits for the completion of an ongoing
> command, if any, and then clears out chip->ops and unregisters
> sysfs entities.
Unregistering in a shutdown handler seems very strange, it also waits
for userspace things, so I wonder if it could be problematic?
Maybe just use
down_write(&chip->ops_sem);
chip->ops = NULL;
up_write(&chip->ops_sem);
In the shutdown handler?
Jason
next prev parent reply other threads:[~2017-01-14 0:28 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-01-14 0:09 [PATCH] tpm/tpm_i2c_infineon: ensure no ongoing commands on shutdown Andrey Pronin
2017-01-14 0:09 ` Andrey Pronin
[not found] ` <20170114000954.17728-1-apronin-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org>
2017-01-14 0:28 ` Jason Gunthorpe [this message]
2017-01-14 0:28 ` Jason Gunthorpe
2017-01-14 0:42 ` Andrey Pronin
2017-01-16 9:33 ` Jarkko Sakkinen
2017-01-25 18:59 ` [tpmdd-devel] " Jarkko Sakkinen
2017-01-16 16:19 ` Jason Gunthorpe
[not found] ` <20170116161919.GA20238-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2017-01-17 17:58 ` Andrey Pronin
2017-01-17 17:58 ` Andrey Pronin
2017-01-17 19:27 ` Jason Gunthorpe
2017-01-17 19:27 ` Jason Gunthorpe
[not found] ` <20170117192728.GF27528-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2017-01-17 20:13 ` Andrey Pronin
2017-01-17 20:13 ` Andrey Pronin
2017-01-17 20:59 ` Jason Gunthorpe
2017-01-17 20:59 ` Jason Gunthorpe
[not found] ` <20170117205933.GA9604-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2017-01-17 23:00 ` Andrey Pronin
2017-01-17 23:00 ` Andrey Pronin
2017-01-17 23:22 ` Jason Gunthorpe
2017-01-17 23:22 ` Jason Gunthorpe
[not found] ` <20170117232207.GA12127-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2017-01-23 20:02 ` Andrey Pronin
2017-01-23 20:02 ` Andrey Pronin
2017-01-23 20:16 ` [tpmdd-devel] " Andrey Pronin
2017-01-23 20:39 ` Jason Gunthorpe
2017-01-23 20:39 ` Jason Gunthorpe
2017-01-23 22:19 ` Andrey Pronin
2017-01-23 22:57 ` Jason Gunthorpe
2017-01-23 22:57 ` Jason Gunthorpe
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