linux-kernel - Re: [PATCH] input: remove BKL from uinput open function

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Message-ID: <520f0cf11001301507k20e3cf8dqa73026e12f3a1767@mail.gmail.com>
Date:	Sun, 31 Jan 2010 00:07:18 +0100
From:	John Kacur <jkacur@...il.com>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Thadeu Lima de Souza Cascardo <cascardo@...oscopio.com>,
	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] input: remove BKL from uinput open function

On Sat, Jan 30, 2010 at 10:57 PM, Arnd Bergmann <arnd@...db.de> wrote:
> On Saturday 30 January 2010, Dmitry Torokhov wrote:
>> On Sat, Jan 30, 2010 at 07:41:20AM +0100, Arnd Bergmann wrote:
>> > The change looks good, but the same driver also uses the BKL in the
>> > default_llseek function. It would be nice to get rid of that in the
>> > same patch, e.g. by adding a ".llseek = generic_file_llseek," line
>> > in the file_operations, or making it call nonseekable_open() if the
>> > driver does not require seek to do anything.
>> >
>>
>> I am afraid you mixed up the drivers, I don't see uinput implementing
>> seek...
>
> Sorry, I should have been clearer, but not implementing llseek
> is the problem I was referring to: When a driver has no explicit
> .llseek operation in its file operations and does not call
> nonseekable_open from its open operation, the VFS layer will
> implicitly use default_llseek, which takes the BKL. We're
> in the process of changing drivers not to do this, one by one
> so we can kill the BKL in the end.
>

I know we've discussed this before, but why wouldn't the following
make more sense?
 .llseek         = no_llseek,
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