On Mon, Dec 11, 2023 at 2:25 PM Jason Gunthorpe <jgg@xxxxxxxx> wrote:
>
> On Mon, Dec 11, 2023 at 03:22:17PM +0200, Leon Romanovsky wrote:
>
> > Please fill some text in commit message.
>
> Yes, explain *why* you are doing this
Oh, sorry. I did not mention it but there's no particular reason
really. The @Subject says it all. There should be no logical or
functional change other than reducing the span of that critical
section. In other words, just nitpicking, not a big deal.
While checking the code (and past changes) related to the other issue
I also sent today I just noticed the way 08bc327629cbd added the
spin_lock before returning from this function and it appeared to me
it's clearer the way I'm proposing here.
Honestly, I was not looking into why the lock is released for that
completion. And I'm not changing that logic.
If this complete() can be called with priv->lock held, the cleanup
would look different, of course.
That said, If you'd like to keep this patch I can send a v2 with the
above details in the message body. Otherwise feel free to drop this.
--nX
> > > diff --git a/drivers/infiniband/ulp/ipoib/ipoib_multicast.c b/drivers/infiniband/ulp/ipoib/ipoib_multicast.c
> > > index 5b3154503bf4..ae2c05806dcc 100644
> > > --- a/drivers/infiniband/ulp/ipoib/ipoib_multicast.c
> > > +++ b/drivers/infiniband/ulp/ipoib/ipoib_multicast.c
> > > @@ -536,17 +536,17 @@ static int ipoib_mcast_join(struct net_device *dev, struct ipoib_mcast *mcast)
> > > multicast = ib_sa_join_multicast(&ipoib_sa_client, priv->ca, priv->port,
> > > &rec, comp_mask, GFP_KERNEL,
> > > ipoib_mcast_join_complete, mcast);
> > > - spin_lock_irq(&priv->lock);
> > > if (IS_ERR(multicast)) {
> > > ret = PTR_ERR(multicast);
> > > ipoib_warn(priv, "ib_sa_join_multicast failed, status %d\n", ret);
> > > + spin_lock_irq(&priv->lock);
> > > /* Requeue this join task with a backoff delay */
> > > __ipoib_mcast_schedule_join_thread(priv, mcast, 1);
> > > clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
> > > spin_unlock_irq(&priv->lock);
> > > complete(&mcast->done);
> > > - spin_lock_irq(&priv->lock);
>
> It is super weird to unlock just around complete.
>
> Jason
>
