linux-kernel - Re: [PATCH] tpm: fix compat 'ppi' link handling in tpm_chip

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Message-ID: <20151109224720.GD1305@obsidianresearch.com>
Date:	Mon, 9 Nov 2015 15:47:20 -0700
From:	Jason Gunthorpe <jgunthorpe@...idianresearch.com>
To:	Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
Cc:	Peter Huewe <peterhuewe@....de>,
	Marcel Selhorst <tpmdd@...horst.net>,
	"moderated list:TPM DEVICE DRIVER" 
	<tpmdd-devel@...ts.sourceforge.net>,
	open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] tpm: fix compat 'ppi' link handling in
 tpm_chip_register()

On Sun, Nov 08, 2015 at 09:51:07AM +0200, Jarkko Sakkinen wrote:
> +		if (rc && rc != -ENOENT) {
> +			tpm_chip_unregister(chip);
> +			return rc;
> +		}
> +	}

This is still goofy looking, the list_add_tail_rcu should be the last
thing done and cannot fail. Just code this with the usual goto based
unwind and goto to do tpm_dev_del_device for the above failure.

> +
>  	return 0;
>  out_err:
>  	tpm1_chip_unregister(chip);

Which avoids calling tpm1_chip_unregister and tpm_chip_unregister in
the same function, which looks so wrong to a casual read..

Jason
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