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Re: [PATCH] vTPM: set virtual device before passing to ibmvtpm_reset_crq

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  Re: [PATCH] vTPM: set virtual device before passing to ibmvtpm_reset_crq Peter Hüwe <PeterHuewe@gmx.de> - 2015-06-16 22:40 +0200
    Re: [PATCH] vTPM: set virtual device before passing to  ibmvtpm_reset_crq "Hon Ching (Vicky) Lo" <honclo@linux.vnet.ibm.com> - 2015-06-16 23:20 +0200

#1166387 — Re: [PATCH] vTPM: set virtual device before passing to ibmvtpm_reset_crq

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@linux.vnet.ibm.com>
> Signed-off-by: Joy Latten <jmlatten@linux.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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#1166410 — 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@linux.vnet.ibm.com>
> > Signed-off-by: Joy Latten <jmlatten@linux.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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