linux-kernel - Re: [tpmdd-devel] [PATCH 1/2] tpm/tpm_ibmvtpm: Fail in ibmvtpm_get_data if driver

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Date:	Mon, 22 Sep 2014 12:03:45 -0600
From:	Jason Gunthorpe <jgunthorpe@...idianresearch.com>
To:	Ashley Lai <ashley@...leylai.com>
Cc:	Anton Blanchard <anton@...ba.org>,
	tpmdd-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org
Subject: Re: [tpmdd-devel] [PATCH 1/2] tpm/tpm_ibmvtpm: Fail in
 ibmvtpm_get_data if driver_data is bad

On Mon, Sep 22, 2014 at 12:43:27PM -0500, Ashley Lai wrote:
> Hi Anton,
> 
> Thanks for the patch.  Is this oops easy to recreate?  If so could 
> you give us the steps to reproduce?

This looks like it is probably related to the uninitialization mess in
the TPM core (resource held during module unload?). A driver should
not have to defend itself against null drvdata, so the BUG makes
more sense than the if it is replacing.

Jason
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