linux-kernel - Re: [PATCH 2/2] tpm: support driver-specific sysfs attrs in tpm_tis

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Date:	Thu, 14 Jul 2016 21:23:27 -0600
From:	Jason Gunthorpe <jgunthorpe@...idianresearch.com>
To:	Andrey Pronin <apronin@...omium.org>
Cc:	Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
	Peter Huewe <peterhuewe@....de>,
	Marcel Selhorst <tpmdd@...horst.net>,
	tpmdd-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org,
	groeck@...omium.org, smbarber@...omium.org, dianders@...omium.org
Subject: Re: [PATCH 2/2] tpm: support driver-specific sysfs attrs in
 tpm_tis_core

On Thu, Jul 14, 2016 at 06:51:36PM -0700, Andrey Pronin wrote:
> -	WARN_ON(chip->groups_cnt != 0);

Nope.

> -	const struct attribute_group *groups[3];
> +	/* up to 4 attribute groups:
> +	 * - driver-specific
> +	 * - common TPM1.2 and TPM2.0
> +	 * - TPM1.2/2.0-specific
> +	 * - ppi
> +	 */
> +	const struct attribute_group *groups[5];

The prior patch needed to have groups[4], every patch much work.

> +	if (priv->phy_ops->attr_group)
> +		chip->groups[chip->groups_cnt++] = priv->phy_ops->attr_group;

I am really not excited about having driver specific sysfs
files.

What is the justification for this?

Jason