linux-kernel - Re: [PATCH RESEND 2/3] tpm: replace dynamically allocated bios

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Date:   Tue, 11 Oct 2016 10:53:55 -0600
From:   Jason Gunthorpe <jgunthorpe@...idianresearch.com>
To:     Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
Cc:     Nayna <nayna@...ux.vnet.ibm.com>, 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 RESEND 2/3] tpm: replace dynamically allocated bios_dir
 with a static array

On Tue, Oct 11, 2016 at 02:23:15PM +0300, Jarkko Sakkinen wrote:
> > >+	chip->bios_dir[cnt] =
> > >  	    securityfs_create_file("ascii_bios_measurements",
> > >-				   S_IRUSR | S_IRGRP, tpm_dir,
> > >+				   S_IRUSR | S_IRGRP, chip->bios_dir[0],
> > >  				   (void *)&tpm_ascii_b_measurments_seqops,
> > >  				   &tpm_bios_measurements_ops);

> > >+	if (is_bad(chip->bios_dir[cnt]))
> > >+		goto err;

> > >+err:
> > >+	chip->bios_dir[cnt] = NULL;
> > 
> > The updated patch looks fine.
> > Just, I am not sure if NULL assignment is needed.
> 
> It's not needed.

It is required to switch an ERR_PTR to NULL, see is_bad()

The original version that used a counter in chip did not need it.

Jason