linux-kernel - Re: [PATCH] driver core: add wait event for deferred probe

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Message-Id: <201302141557.18308.arnd@arndb.de>
Date:	Thu, 14 Feb 2013 15:57:18 +0000
From:	Arnd Bergmann <arnd@...db.de>
To:	Haojian Zhuang <haojian.zhuang@...aro.org>
Cc:	Grant Likely <grant.likely@...retlab.ca>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
	viro@...iv.linux.org.uk, rusty@...tcorp.com.au,
	hpa@...ux.intel.com, jim.cromie@...il.com,
	linux-kernel@...r.kernel.org,
	"Russell King - ARM Linux" <linux@....linux.org.uk>,
	Linus Walleij <linus.walleij@...aro.org>,
	broonie@...nsource.wolfsonmicro.com,
	Patch Tracking <patches@...aro.org>
Subject: Re: [PATCH] driver core: add wait event for deferred probe

On Thursday 14 February 2013, Haojian Zhuang wrote:
> If you can change it into code in below, it could work. Otherwise, it
> always fails.
>         driver_deferred_probe_enable = true;
>         driver_deferred_probe_trigger();
> +      deferred_probe_work_func(NULL);
>         return 0;
> 
> Because deferred_probe_work_func() depends on that deferred_probe is added
> into deferred_probe_active_list. If driver_deferred_probe_trigger() isn't called
> first, the deferred uart probe can't be added into active list. So even you call
> work_func at here, it doesn't help.
> 

Would that not cause two instances of the work function to run at the same time?
That sounds like a source for a lot of problems.

	Arnd
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