linux-kernel - Re: [PATCH v2] tpm: enable PPI for TPM 2.0

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Message-ID: <20150421193338.GA31179@obsidianresearch.com>
Date:	Tue, 21 Apr 2015 13:33:38 -0600
From:	Jason Gunthorpe <jgunthorpe@...idianresearch.com>
To:	Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
Cc:	peterhuewe@....de, tpmdd-devel@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org, Marcel Selhorst <tpmdd@...horst.net>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Tejun Heo <tj@...nel.org>, Al Viro <viro@...iv.linux.org.uk>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jianyu Zhan <nasa4836@...il.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Rasmus Villemoes <linux@...musvillemoes.dk>,
	Andrzej Hajda <a.hajda@...sung.com>, NeilBrown <neilb@...e.de>,
	Guenter Roeck <linux@...ck-us.net>,
	Simon Wunderlich <sw@...onwunderlich.de>
Subject: Re: [PATCH v2] tpm: enable PPI for TPM 2.0

On Tue, Apr 21, 2015 at 09:30:55PM +0300, Jarkko Sakkinen wrote:
> Enabled PPI interface to the character device sysfs directory accessible
> both for 1.x and 2.0 devices.
> 
> The ppi group is moved from the platform device directory to the
> character device directory. In order to retain backwards compatibility
> with the 1.x devices, a symlink is created to the platform device
> directory.
> 
> Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>

> Reviewed-by: Jason Gunthorpe <jason.gunthorpe@...idianresearch.com>

Jumping the gun a bit, there :)
But yes, the TPM bits still look OK to me.

Ah, don't forget to update Documentation/ABI/testing/sysfs-driver-ppi

> diff --git a/fs/kernfs/dir.c b/fs/kernfs/dir.c
> index 6acc964..749cea3 100644
> +++ b/fs/kernfs/dir.c
> @@ -1225,6 +1225,7 @@ int kernfs_remove_by_name_ns(struct kernfs_node *parent, const char *name,
>  	else
>  		return -ENOENT;
>  }
> +EXPORT_SYMBOL_GPL(kernfs_remove_by_name_ns);

??
I don't see this being called

> +/**
> + * sysfs_link_group_to_kobj - add a symlink to a kobject pointing to a group
> + * @kobj:		The kobject containing the group.
> + * @target_kobj:	The target kobject.
> + * @target_name:	Name of the target group.
> + */
> +int sysfs_link_group_to_kobj(struct kobject *kobj, struct kobject *target_kobj,
> +			     const char *target_name)

Agree with Guenter, separate patch.

I liked the signature I suggested earlier:

sysfs_link_group_to_kobj(struct kobject *from_kobj,
			 const char *from_name,
                         struct kobject *target_kobj,
                         const char *target_name)

'link_group' may be too specific a name, I think this would work to
establish a link to any file in a sysfs directory? Which is good,
we'll need that for future TPM patches that relocate the other sysfs
files..

Jason
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