linux-kernel - Re: [PATCH v4 1/2] tpm: Unify the send callback behaviourä

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Date:   Fri, 8 Feb 2019 22:46:35 +0200
From:   Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:     Stefan Berger <stefanb@...ux.ibm.com>
Cc:     linux-integrity@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-security-module@...r.kernel.org,
        Peter Huewe <PeterHuewe@....de>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Stefan Berger <stefanb@...ux.vnet.ibm.com>,
        Alexander Steffen <Alexander.Steffen@...ineon.com>,
        stable@...r.kernel.org
Subject: Re: [PATCH v4 1/2] tpm: Unify the send callback behaviourä

On Fri, Feb 08, 2019 at 03:32:32PM -0500, Stefan Berger wrote:
> On 2/8/19 3:23 PM, Jarkko Sakkinen wrote:
> > On Fri, Feb 08, 2019 at 02:27:31PM -0500, Stefan Berger wrote:
> > > On 2/8/19 2:17 PM, Jarkko Sakkinen wrote:
> > > >    */
> > > > if (rc > 0) {
> > > > 	dev_warn(&chip->dev,
> > > > 		 "%s: send(): invalid value %d\n", __func__, rc);
> > > > 	rc = 0;
> > > > }
> > > > 
> > > > Should be fairly safe play now.
> > > Unfortuantely it isn't. You seemed to have lost the
> > > EXPORT_SYMBOL_GPL(tpm_chip_start/stop) and the tpm_chip_start/stop around
> > > the tpm2_shutdown()...
> > OK, now those fixes are back. In tpm_pm_shutdown() case you need also
> > take the lock.
> 
> tpm_del_char_device also needs the start/stop!

Done and updated the commit message to have all the call sites:

    * tpm_chip_register()
    * tpm_class_shutdown()
    * tpm_del_char_device()
    * tpm_pm_suspend()
    * tpm_try_get_ops() and tpm_put_ops()
    * tpm2_del_space()

/Jarkko