netdev - Re: [PATCH 06/21] RDS: Connection handling

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Message-ID: <20090127133418.GH2646@ioremap.net>
Date:	Tue, 27 Jan 2009 16:34:19 +0300
From:	Evgeniy Polyakov <zbr@...emap.net>
To:	Andy Grover <andy.grover@...cle.com>
Cc:	rdreier@...co.com, rds-devel@....oracle.com,
	general@...ts.openfabrics.org, netdev@...r.kernel.org
Subject: Re: [PATCH 06/21] RDS: Connection handling

On Mon, Jan 26, 2009 at 06:17:43PM -0800, Andy Grover (andy.grover@...cle.com) wrote:
> +static inline int rds_conn_is_sending(struct rds_connection *conn)
> +{
> +	int ret = 0;
> +
> +	if (!mutex_trylock(&conn->c_send_lock))
> +		ret = 1;
> +	else
> +		mutex_unlock(&conn->c_send_lock);
> +
> +	return ret;
> +}
> +

This one is eventually invoked under the spin_lock with turned off irqs,
which may freeze the machine:
rds_for_each_conn_info() -> spin_lock_irqsave(global lock) ->
rds_conn_info_visitor() -> rds_conn_info_set() -> rds_conn_is_sending()
-> boom.

I did not not check further though.

-- 
	Evgeniy Polyakov
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