linux-kernel - Re: And now for something _totally

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Date:	Tue, 19 Jun 2007 14:48:44 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Mariusz Kozlowski <m.kozlowski@...land.pl>
cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>
Subject: Re: And now for something _totally_ different: Linux v2.6.22-rc5

On Tue, 19 Jun 2007, Mariusz Kozlowski wrote:
> 
> 	MAINTAINERS says riscom8 is orphaned so not sure
> if anybody cares. Spotted this when playing with modprobe
> walking /lib/modules/`uname -r`/kernel in a loop ;)

Oh wow.

I wonder why it does that. The code literally does:

        save_flags(flags);
        cli();
        tty_unregister_driver(riscom_driver);
        put_tty_driver(riscom_driver);
        restore_flags(flags);

and I don't see the point.

(And that's what then causes the warning: tty_unregister_driver will 
eventually get a mutex, but the caller had disabled hardware interrupts..

I see absolutely *zero* reason for that whole save_flags/cli/restore_flags 
dance at all, so I think the right thing to do is to just remove it.

I'm Cc'ing Alan, in case he cares. 

Mariusz, if you actually *use* the dang thing, and really care, you can 
send me a tested patch. I can pretty much guarantee that removing those 
irq games won't make things any worse, but no way am I going to just 
remove it on my own without any users or any testing.

		Linus
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