linux-kernel - Re: [PATCH 2/5] Char: isicom, fix probe race

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Date:	Tue, 19 Dec 2006 00:48:33 +0100
From:	Jiri Slaby <jirislaby@...il.com>
To:	Andrew Morton <akpm@...l.org>
CC:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/5] Char: isicom, fix probe race

Andrew Morton wrote:
> On Sat, 16 Dec 2006 02:09:48 +0100 (CET)
> Jiri Slaby <jirislaby@...il.com> wrote:
> 
>> isicom, fix probe race
>>
>> Fix two race conditions in the probe function with mutex.
>>
>> ...
>>
>>  static int __devinit isicom_probe(struct pci_dev *pdev,
>>  	const struct pci_device_id *ent)
>>  {
>> +	static DEFINE_MUTEX(probe_lock);
> 
> hm.  How can isicom_probe() race with itself?  Even with the dreaded
> multithreaded-pci-probing?  It's only called once, by a single thread.
> 
> Confused.

Yeah, I'm a little bit too now. One of developers want me to do this some time
ago and I did it without deep thinking about that. Now, I did it again and as
you wrote, it's completely unreasonable. Please, throw it
(char-isicom-fix-probe-race.patch) away.

thanks,
-- 
http://www.fi.muni.cz/~xslaby/            Jiri Slaby
faculty of informatics, masaryk university, brno, cz
e-mail: jirislaby gmail com, gpg pubkey fingerprint:
B674 9967 0407 CE62 ACC8  22A0 32CC 55C3 39D4 7A7E
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