netdev - Re: [PATCH net-next v3 2/2] net/rds: Give each connection path its own workqueue

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Message-ID: <aS8BWWQDiDMjxpGZ@horms.kernel.org>
Date: Tue, 2 Dec 2025 15:10:17 +0000
From: Simon Horman <horms@...nel.org>
To: Allison Henderson <achender@...nel.org>
Cc: netdev@...r.kernel.org, pabeni@...hat.com, edumazet@...gle.com,
	rds-devel@....oracle.com, kuba@...nel.org,
	linux-rdma@...r.kernel.org, allison.henderson@...cle.com
Subject: Re: [PATCH net-next v3 2/2] net/rds: Give each connection path its
 own workqueue

On Sun, Nov 30, 2025 at 11:10:36PM -0700, Allison Henderson wrote:

...

> diff --git a/net/rds/connection.c b/net/rds/connection.c
> index dc7323707f450..cfe6b50db8a6f 100644
> --- a/net/rds/connection.c
> +++ b/net/rds/connection.c
> @@ -269,7 +269,11 @@ static struct rds_connection *__rds_conn_create(struct net *net,
>  		__rds_conn_path_init(conn, &conn->c_path[i],
>  				     is_outgoing);
>  		conn->c_path[i].cp_index = i;
> -		conn->c_path[i].cp_wq = rds_wq;
> +		conn->c_path[i].cp_wq =
> +			alloc_ordered_workqueue("krds_cp_wq#%lu/%d", 0,
> +						rds_conn_count, i);
> +		if (!conn->c_path[i].cp_wq)
> +			conn->c_path[i].cp_wq = rds_wq;
>  	}
>  	rcu_read_lock();
>  	if (rds_destroy_pending(conn))

Hi Allison,

The code following the hunk above looks like this:

		ret = -ENETDOWN;
	else
		ret = trans->conn_alloc(conn, GFP_ATOMIC);
	if (ret) {
		rcu_read_unlock();
		kfree(conn->c_path);
		kmem_cache_free(rds_conn_slab, conn);
		conn = ERR_PTR(ret);
		goto out;
	}

There are no more error paths that free resources in the remainder of
the function. And the out label simply returns conn.

It looks like the ordered workqueue allocation added by this patch
will be leaked if we reach the error condition above.

Flagged by Code Spell with review prompts.

https://netdev-ai.bots.linux.dev/ai-review.html?id=89a5d15b-cd8c-4403-81ff-8577dc0069a6#patch-1

...

Also, please note that net-next is currently closed for the merge window.
So the usual guidance about that applies:

## Form letter - net-next-closed

The merge window for v6.19 has begun and therefore net-next is closed
for new drivers, features, code refactoring and optimizations. We are
currently accepting bug fixes only.

Please repost when net-next reopens after 15th December.

RFC patches sent for review only are obviously welcome at any time.

See: https://www.kernel.org/doc/html/next/process/maintainer-netdev.html#development-cycle

-- 
pw-bot: changes-requested