linux-kernel - Re: [PATCH] vTPM: set virtual device before passing to ibmvtpm_reset

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Date:	Tue, 16 Jun 2015 17:18:37 -0400
From:	"Hon Ching (Vicky) Lo" <honclo@...ux.vnet.ibm.com>
To:	Peter Hüwe <PeterHuewe@....de>
Cc:	tpmdd-devel@...ts.sourceforge.net,
	Ashley Lai <ashley@...leylai.com>,
	Vicky Lo <honclo2014@...il.com>, linux-kernel@...r.kernel.org,
	Joy Latten <jmlatten@...ux.vnet.ibm.com>
Subject: Re: [PATCH] vTPM: set virtual device before passing to
 ibmvtpm_reset_crq

Hi Peter,

Yes, it's a fix to a kernel dump caused by enabling both vtpm and kdump.


On Tue, 2015-06-16 at 22:37 +0200, Peter Hüwe wrote:
> Hey,
> 
> Am Freitag, 22. Mai 2015, 19:23:02 schrieb Hon Ching(Vicky) Lo:
> > tpm_ibmvtpm_probe() calls ibmvtpm_reset_crq(ibmvtpm) without having yet
> > set the virtual device in the ibmvtpm structure. So in ibmvtpm_reset_crq,
> > the phype call contains empty unit addresses, ibmvtpm->vdev->unit_address.
> > 
> > Signed-off-by: Hon Ching(Vicky) Lo <honclo@...ux.vnet.ibm.com>
> > Signed-off-by: Joy Latten <jmlatten@...ux.vnet.ibm.com>
> > ---
> >  drivers/char/tpm/tpm_ibmvtpm.c |    5 +++--
> >  1 files changed, 3 insertions(+), 2 deletions(-)
> > 
> > diff --git a/drivers/char/tpm/tpm_ibmvtpm.c
> > b/drivers/char/tpm/tpm_ibmvtpm.c index 42ffa5e..27ebf95 100644
> > --- a/drivers/char/tpm/tpm_ibmvtpm.c
> > +++ b/drivers/char/tpm/tpm_ibmvtpm.c
> > @@ -578,6 +578,9 @@ static int tpm_ibmvtpm_probe(struct vio_dev *vio_dev,
> >  		goto cleanup;
> >  	}
> > 
> > +	ibmvtpm->dev = dev;
> > +	ibmvtpm->vdev = vio_dev;
> > +
> >  	crq_q = &ibmvtpm->crq_queue;
> >  	crq_q->crq_addr = (struct ibmvtpm_crq *)get_zeroed_page(GFP_KERNEL);
> >  	if (!crq_q->crq_addr) {
> > @@ -622,8 +625,6 @@ static int tpm_ibmvtpm_probe(struct vio_dev *vio_dev,
> > 
> >  	crq_q->index = 0;
> > 
> > -	ibmvtpm->dev = dev;
> > -	ibmvtpm->vdev = vio_dev;
> >  	TPM_VPRIV(chip) = (void *)ibmvtpm;
> > 
> >  	spin_lock_init(&ibmvtpm->rtce_lock);
> 
> Is this a fix for something?
> does it need to go through stable?
> 
> Thanks,
> Peter
> 


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