On Thu, Feb 11, 2021 at 01:02:14PM +0000, Stefan Chulski wrote:
> > On Thu, Feb 11, 2021 at 12:48:55PM +0200, stefanc@xxxxxxxxxxx wrote:
> > > diff --git a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
> > > b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
> > > index 761f745..8b4073c 100644
> > > --- a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
> > > +++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
> > > @@ -1133,14 +1133,19 @@ static inline void
> > > mvpp2_qvec_interrupt_disable(struct mvpp2_queue_vector *qvec) static
> > > void mvpp2_interrupts_mask(void *arg) {
> > > struct mvpp2_port *port = arg;
> > > + int cpu = smp_processor_id();
> > > + u32 thread;
> > >
> > > /* If the thread isn't used, don't do anything */
> > > - if (smp_processor_id() > port->priv->nthreads)
> > > + if (cpu > port->priv->nthreads)
> > > return;
> >
> > What happened to a patch fixing this? Did I miss it? Was it submitted
> > independently to the net tree?
>
> Some reviewers asked to remove this from the series. I would send it as separate patch to net.
It is not a regression, and although it is a fix, as you explained when
I first raised it, it isn't a condition that can be reached due to:
priv->nthreads = min_t(unsigned int, num_present_cpus(),
MVPP2_MAX_THREADS);
and I don't think we support a dynamic present CPU mask on any platform
that is currently supported by this driver.
If we did, then it would be possible for the off-by-one issue to be
triggered.
No matter what, it should happen _before_ this patch set is merged.
Trying to do it afterwards guarantees more pain if stable trees decide
they want to backport the fix.
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