linux-kernel - Re: [PATCH v3] tpm: fix crash in tpm

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Message-ID: <20160413171127.GB28411@obsidianresearch.com>
Date:	Wed, 13 Apr 2016 11:11:27 -0600
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 v3] tpm: fix crash in tpm_tis deinitialization

On Wed, Apr 13, 2016 at 10:22:06AM +0300, Jarkko Sakkinen wrote:
> rmmod crashes the driver because tpm_chip_unregister() already sets ops
> to NULL. This commit fixes the issue by moving tpm2_shutdown() to
> tpm_chip_unregister(). This commit is also cleanup because it removes
> duplicate code from tpm_crb and tpm_tis to the core.
> 
> v2: make sending shutdown command atomic with nulling ops
> v3: forgot to amend updates, sorry :(
> Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
> Fixes: 4d3eac5e156a ("tpm: Provide strong locking for device
> removal")

You patch got a little mangled.. The v2/v3 should be after the
diffstat, not in the commit message and the --- after the SOB section
is missing..

Otherwise it looks fine

Reviewed-by: Jason Gunthorpe <jgunthorpe@...idianresearch.com>

>  extern int tpm2_startup(struct tpm_chip *chip, u16 startup_type);
> -extern void tpm2_shutdown(struct tpm_chip *chip, u16 shutdown_type);
> +void tpm2_shutdown(struct tpm_chip *chip, u16 shutdown_type);

Drop this hunk though, doesn't do anything.

If you don't like the unnecessary externs on functions then get rid of
them all in a patch.

Jason