linux-kernel - Re: [PATCH 2/2] module: fix bne2 "gave up waiting for init of module libcrc32c"

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Message-ID: <alpine.LFD.2.00.1006012129420.8175@i5.linux-foundation.org>
Date:	Tue, 1 Jun 2010 21:32:19 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Rusty Russell <rusty@...tcorp.com.au>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Brandon Philips <brandon@...p.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	LKML <linux-kernel@...r.kernel.org>,
	Jon Masters <jonathan@...masters.org>,
	Tejun Heo <htejun@...il.com>,
	Masami Hiramatsu <mhiramat@...hat.com>,
	Kay Sievers <kay.sievers@...y.org>
Subject: Re: [PATCH 2/2] module: fix bne2 "gave up waiting for init of module
 libcrc32c"



On Wed, 2 Jun 2010, Rusty Russell wrote:
> 
> > I would like to note that your original "fix things by dropping the lock" 
> > patch that I hated so much had this exact bug too. Making this a good 
> > example of _why_ it's basically always wrong to drop locks in the middle - 
> > even if you claimed you knew and understood the locking.
> 
> And I would like to note that it didn't :)  It grabbed references only on
> completed modules.

Right you are, I misread the patch. You re-did the whole module lookup, 
something that the original code didn't do. And yes, that should be safe.

			Linus
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