Re: [patch] drivers: wait for threaded probes between initcall levels

Stephen Hemminger
2006-10-27T18:55:58Z

On Fri, 27 Oct 2006 11:42:37 -0700
Andrew Morton <akpm@osdl.org> wrote:

> From: Andrew Morton <akpm@osdl.org>
>
> The multithreaded-probing code has a problem: after one initcall level (eg,
> core_initcall) has been processed, we will then start processing the next
> level (postcore_initcall) while the kernel threads which are handling
> core_initcall are still executing. This breaks the guarantees which the
> layered initcalls previously gave us.
>
> IOW, we want to be multithreaded _within_ an initcall level, but not between
> different levels.
>
> Fix that up by causing the probing code to wait for all outstanding probes at
> one level to complete before we start processing the next level.
>
> Cc: Greg KH <greg@kroah.com>
> Signed-off-by: Andrew Morton <akpm@osdl.org>
> ---
>

This looks like a good place to use a counting semaphore.

--
Stephen Hemminger <shemminger@osdl.org>