Re: [PATCH 3/8] IPMI: Run to completion fixes

[Andrew Morton <akpm@linux-foundation.org>]

On Wed, 13 Feb 2008 10:23:42 -0600
Corey Minyard <minyard@acm.org> wrote:

> From: Corey Minyard <cminyard@mvista.com>
> 
> The "run_to_completion" mode was somewhat broken.  Locks need to be
> avoided in run_to_completion mode, and it shouldn't be used by normal
> users, just internally for panic situations.
> 
> This patch removes locks in run_to_completion mode and removes the
> user call for setting the mode.  The only user was the poweroff
> code, but it was easily converted to use the polling interface.
> 
> +	/*
> +	 * Spin until our message is done.
> +	 */
> +	while (atomic_read(&dummy_count) > 0) {
> +		ipmi_poll_interface(user);
> +		barrier();
> +	}

we'd normally use cpu_relax() here.