Re: [PATCH] tpm: fix compat 'ppi' link handling in tpm_chip_register()

[Jason Gunthorpe <jgunthorpe@obsidianresearch.com>]

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