Re: [Xen-devel] [PATCH 15/19] Qemu-Xen-vTPM: Xen frontend driver infrastructure

["Xuquan (Euler)" <xuquan8@xxxxxxxxxx>]

On August 07, 2016 7:39 PM, Emil Condrea <emilcondrea@xxxxxxxxx> wrote:
On Mon, Jul 25, 2016 at 7:01 PM, Anthony PERARD <anthony.perard@xxxxxxxxxx> 
wrote:
> >
> > > +{
> > > +    xs_transaction_t xbt = XBT_NULL;
> > > +
> > > +    if (xendev->fe_state == xbus) {
> > > +        return 0;
> > > +    }
> > > +
> > > +    xendev->fe_state = xbus;
> > > +    if (xendev->fe == NULL) {
> > > +        xen_pv_printf(NULL, 0, "xendev->fe is NULL\n");
> > > +        return -1;
> > > +    }
> > > +
> > > +retry_transaction:

Add a space here, then
   s/retry_transaction:/ retry_transaction:/
the same for the other cases..


> > > +    xbt = xs_transaction_start(xenstore);
> > > +    if (xbt == XBT_NULL) {
> > > +        goto abort_transaction;
> > > +    }
> >
> > There is a transaction started, but I don't think it is used by the
> > function below. Could you remove the transaction?
>
> I will remove it. For current version I don't see a direct usage of this 
> transaction.
> Quan, did you have a specific reason for past versions for this transaction?

No specific reason, maybe I copied these code from xen / libxl .. 
btw, why does libxl use ' retry_transaction: ' logic ... but QEMU doesn't ?


Thank you both.

Quan

> >
> >
> > > +    if (xenstore_write_int(xendev->fe, "state", xbus)) {
> > > +        goto abort_transaction;
> > > +    }
> > > +
> > > +    if (!xs_transaction_end(xenstore, xbt, 0)) {
> > > +        if (errno == EAGAIN) {
> > > +            goto retry_transaction;
> > > +        }
> > > +    }
> > > +
> > > +    return 0;
> > > +
> > > +abort_transaction:
> > > +    xs_transaction_end(xenstore, xbt, 1);
> > > +    return -1;
> > > +}
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