On Mon, Jan 26, 2009 at 06:17:43PM -0800, Andy Grover ([email protected])
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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