Re: [PATCH rdma-rc] RDMA/mlx5: Fix mkey cache possible deadlock on cleanup

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On Thu, Sep 21, 2023 at 11:27:16AM +0300, Leon Romanovsky wrote:
> On Wed, Sep 20, 2023 at 11:01:12AM -0300, Jason Gunthorpe wrote:
> > On Wed, Sep 20, 2023 at 12:56:18PM +0300, Leon Romanovsky wrote:
> > > @@ -1796,6 +1804,10 @@ static int cache_ent_find_and_store(struct mlx5_ib_dev *dev,
> > >  	}
> > >  
> > >  	mutex_lock(&cache->rb_lock);
> > > +	if (cache->disable) {
> > > +		mutex_unlock(&cache->rb_lock);
> > > +		return 0;
> > > +	}
> > 
> > 
> > I don't get this.
> > 
> > Shouldn't we just initialize the ent->disabled to cache->disabled if
> > we happen to be creating a new ent?
 
> I'm convinced that new entries can't be created when we are calling to
> mlx5_mkey_cache_cleanup().

That's a better answer

Jason



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