netdev - Re: [PATCH rdma-next v4 06/17] RDMA/counter: Add "auto" configuration mode support

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Date:   Mon, 1 Jul 2019 11:42:13 +0300
From:   Leon Romanovsky <leon@...nel.org>
To:     Jason Gunthorpe <jgg@...lanox.com>
Cc:     Doug Ledford <dledford@...hat.com>,
        RDMA mailing list <linux-rdma@...r.kernel.org>,
        Majd Dibbiny <majd@...lanox.com>,
        Mark Zhang <markz@...lanox.com>,
        Saeed Mahameed <saeedm@...lanox.com>,
        linux-netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH rdma-next v4 06/17] RDMA/counter: Add "auto"
 configuration mode support

On Sun, Jun 30, 2019 at 12:40:54AM +0000, Jason Gunthorpe wrote:
> On Tue, Jun 18, 2019 at 08:26:14PM +0300, Leon Romanovsky wrote:
>
> > +static void __rdma_counter_dealloc(struct rdma_counter *counter)
> > +{
> > +	mutex_lock(&counter->lock);
> > +	counter->device->ops.counter_dealloc(counter);
> > +	mutex_unlock(&counter->lock);
> > +}
>
> Does this lock do anything? The kref is 0 at this point, so no other
> thread can have a pointer to this lock.

Yes, it is leftover from atomic_read implementation.

>
> > +
> > +static void rdma_counter_dealloc(struct rdma_counter *counter)
> > +{
> > +	if (!counter)
> > +		return;
>
> Counter is never NULL.

Ohh, right, I'll clean some code near rdma_counter_dealloc/__rdma_counter_dealloc.

Thanks

>
> Jason