linux-kernel - Re: [tpmdd-devel] [PATCH 09/13] tpm: Pull everything related to sysfs into tpm-sysfs.c

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Date:	Mon, 23 Sep 2013 14:54:21 -0400
From:	Daniel De Graaf <dgdegra@...ho.nsa.gov>
To:	Jason Gunthorpe <jgunthorpe@...idianresearch.com>
CC:	tpmdd-devel@...ts.sourceforge.net,
	Leonidas Da Silva Barbosa <leosilva@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org, Rajiv Andrade <mail@...jiv.net>,
	Sirrix AG <tpmdd@...rix.com>
Subject: Re: [tpmdd-devel] [PATCH 09/13] tpm: Pull everything related to sysfs
 into tpm-sysfs.c

On 09/23/2013 02:14 PM, Jason Gunthorpe wrote:
> CLASS-sysfs.c is a common idiom for linux subsystems.
>
> This pulls all the sysfs attribute functions and related code
> into tpm-sysfs.c. To support this change some constants are moved
> from tpm.c to tpm.h and __tpm_pcr_read is made non-static and is
> called tpm_pcr_read_dev.
>
> Signed-off-by: Jason Gunthorpe <jgunthorpe@...idianresearch.com>
[...]
> diff --git a/drivers/char/tpm/xen-tpmfront.c b/drivers/char/tpm/xen-tpmfront.c
> index 12a4ab2..7892557 100644
> --- a/drivers/char/tpm/xen-tpmfront.c
> +++ b/drivers/char/tpm/xen-tpmfront.c
[...]
> -static DEVICE_ATTR(durations, S_IRUGO, tpm_show_durations, NULL);
> -static DEVICE_ATTR(timeouts, S_IRUGO, tpm_show_timeouts, NULL);
> -static DEVICE_ATTR(locality, S_IRUGO | S_IWUSR, tpm_show_locality,
> -		tpm_store_locality);

This patch drops the "locality" sysfs attribute from xen-tpmfront. Since
that attribute is currently only implemented for the xen TPM driver, it
is best to leave it there for now (and its show/store functions could
also be made static, an oversight I just noticed now). If this attribute
is later made available on other TPM drivers, it may need to contain
device-specific logic, but such an implementation is well outside the
scope of this series.

-- 
Daniel De Graaf
National Security Agency
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