linux-kernel - Re: [v4l-dvb-maintainer] Re: [GIT PATCHES] V4L/DVB updates

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Date:	Mon, 16 Apr 2007 14:49:51 -0700 (PDT)
From:	Trent Piepho <xyzzy@...akeasy.org>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>
cc:	Mauro Carvalho Chehab <mchehab@...radead.org>,
	linux-dvb-maintainer@...uxtv.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	video4linux-list@...hat.com, linux-kernel@...r.kernel.org
Subject: Re: [v4l-dvb-maintainer] Re: [GIT PATCHES] V4L/DVB updates

On Mon, 16 Apr 2007, Dmitry Torokhov wrote:
> Hi Mauro,
>
> On 4/15/07, Mauro Carvalho Chehab <mchehab@...radead.org> wrote:
> >   - Fix Kernel Bugzilla #8301: spinlock fix for flexcop-pci
>
> While move of spin_lock_init before request_irq is obviously correct I
> wonder what is the reason behind changing spin_lock_irq() into
> spin_lock_irqsave() as I do not see flexcop_pci_isr being called from
> anywhere but IRQ context.
>
> BTW, is irq_lock needed at all?

There was some more discussion on the linux-dvb list
http://www.linuxtv.org/pipermail/linux-dvb/2007-April/017024.html , and I
think we came to the conclusion that irq_lock isn't needed at all.  It does
nothing but serialize the ISR and ISRs are automatically serialized by the
kernel.
-
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