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Date:   Thu, 28 Sep 2023 12:59:16 +0300
From:   Leon Romanovsky <leon@kernel.org>
To:     Stephen Rothwell <sfr@canb.auug.org.au>
Cc:     Doug Ledford <dledford@redhat.com>,
        Jason Gunthorpe <jgg@mellanox.com>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Linux Next Mailing List <linux-next@vger.kernel.org>,
        Michael Guralnik <michaelgur@nvidia.com>,
        Shay Drory <shayd@nvidia.com>
Subject: Re: linux-next: manual merge of the rdma tree with the rdma-fixes
 tree
Message-ID: <20230928095916.GS1642130@unreal>
References: <20230928113851.5197a1ec@canb.auug.org.au>
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On Thu, Sep 28, 2023 at 11:38:51AM +1000, Stephen Rothwell wrote:
> Hi all,
> 
> Today's linux-next merge of the rdma tree got a conflict in:
> 
>   drivers/infiniband/hw/mlx5/mr.c
> 
> between commit:
> 
>   374012b00457 ("RDMA/mlx5: Fix mkey cache possible deadlock on cleanup")
> 
> from the rdma-fixes tree and commit:
> 
>   57e7071683ef ("RDMA/mlx5: Implement mkeys management via LIFO queue")
> 
> from the rdma tree.
> 
> I fixed it up (see below) and can carry the fix as necessary. This
> is now fixed as far as linux-next is concerned, but any non trivial
> conflicts should be mentioned to your upstream maintainer when your tree
> is submitted for merging.  You may also want to consider cooperating
> with the maintainer of the conflicting tree to minimise any particularly
> complex conflicts.
> 
> -- 
> Cheers,
> Stephen Rothwell
> 
> diff --cc drivers/infiniband/hw/mlx5/mr.c
> index 433f96459246,b0fa2d644973..000000000000
> --- a/drivers/infiniband/hw/mlx5/mr.c
> +++ b/drivers/infiniband/hw/mlx5/mr.c
> @@@ -1025,21 -998,15 +999,21 @@@ void mlx5_mkey_cache_cleanup(struct mlx
>   	if (!dev->cache.wq)
>   		return;
>   
>  -	cancel_delayed_work_sync(&dev->cache.remove_ent_dwork);
>   	mutex_lock(&dev->cache.rb_lock);
>  +	dev->cache.disable = true;
>   	for (node = rb_first(root); node; node = rb_next(node)) {
>   		ent = rb_entry(node, struct mlx5_cache_ent, node);
> - 		xa_lock_irq(&ent->mkeys);
> + 		spin_lock_irq(&ent->mkeys_queue.lock);
>   		ent->disabled = true;
> - 		xa_unlock_irq(&ent->mkeys);
> + 		spin_unlock_irq(&ent->mkeys_queue.lock);
>  -		cancel_delayed_work_sync(&ent->dwork);
>   	}
>  +	mutex_unlock(&dev->cache.rb_lock);
>  +
>  +	/*
>  +	 * After all entries are disabled and will not reschedule on WQ,
>  +	 * flush it and all async commands.
>  +	 */
>  +	flush_workqueue(dev->cache.wq);
>   
>   	mlx5_mkey_cache_debugfs_cleanup(dev);
>   	mlx5_cmd_cleanup_async_ctx(&dev->async_ctx);

Thanks for the fix.