Re: [patch] drivers: wait for threaded probes between initcalllevels

[Stephen Hemminger]

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

> From: Andrew Morton <akpm@xxxxxxxx>
> 
> 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@xxxxxxxxx>
> Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
> ---
> 

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

-- 
Stephen Hemminger <shemminger@xxxxxxxx>
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