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Date:   Tue, 1 Mar 2022 10:05:44 -0400
From:   Jason Gunthorpe <jgg@ziepe.ca>
To:     Lino Sanfilippo <LinoSanfilippo@gmx.de>
Cc:     peterhuewe@gmx.de, jarkko@kernel.org, stefanb@linux.vnet.ibm.com,
        James.Bottomley@hansenpartnership.com, David.Laight@ACULAB.COM,
        linux-integrity@vger.kernel.org, linux-kernel@vger.kernel.org,
        p.rosenberger@kunbus.com,
        Lino Sanfilippo <l.sanfilippo@kunbus.com>,
        stable@vger.kernel.org
Subject: Re: [PATCH v8 1/1] tpm: fix reference counting for struct tpm_chip
Message-ID: <20220301140544.GF6468@ziepe.ca>
References: <20220301022108.30310-1-LinoSanfilippo@gmx.de>
 <20220301022108.30310-2-LinoSanfilippo@gmx.de>
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In-Reply-To: <20220301022108.30310-2-LinoSanfilippo@gmx.de>
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On Tue, Mar 01, 2022 at 03:21:08AM +0100, Lino Sanfilippo wrote:
> @@ -653,8 +623,10 @@ void tpm_chip_unregister(struct tpm_chip *chip)
>  	if (IS_ENABLED(CONFIG_HW_RANDOM_TPM) && !tpm_is_firmware_upgrade(chip))
>  		hwrng_unregister(&chip->hwrng);
>  	tpm_bios_log_teardown(chip);
> -	if (chip->flags & TPM_CHIP_FLAG_TPM2 && !tpm_is_firmware_upgrade(chip))
> +	if (chip->flags & TPM_CHIP_FLAG_TPM2 && !tpm_is_firmware_upgrade(chip)) {
>  		cdev_device_del(&chip->cdevs, &chip->devs);
> +		put_device(&chip->devs);
> +	}

I would put those two lines in a function bside tpm_devs_add() as
well, more modular.

It looks like a good idea to me

Jason