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

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Message-ID: <CAD6h2NS_eR7zJjwAuBJPRrCb9=-4r=y-QJt7Lvg5U+yBf-e=kw@mail.gmail.com>
Date:	Fri, 15 Feb 2013 00:04:18 +0800
From:	Haojian Zhuang <haojian.zhuang@...aro.org>
To:	Arnd Bergmann <arnd@...db.de>
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 Russell <rusty@...tcorp.com.au>,
	hpa@...ux.intel.com, Jim Cromie <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 14 February 2013 23:57, Arnd Bergmann <arnd@...db.de> wrote:
> 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

Two instances of the work function? I'm sorry that I don't
understanding your meaning.
Could you help explain your question?

Best Regards
Haojian
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