linux-kernel - Re: [RFC][PATCH] irq: support IRQ_NESTED_THREAD with non-threaded interrupt handlers

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Date:	Sat, 5 Jun 2010 15:10:31 +0100
From:	Marc Zyngier <maz@...terjones.org>
To:	Esben Haabendal <esbenhaabendal@...il.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Esben Haabendal <eha@...edevelopment.dk>,
	linux-kernel@...r.kernel.org, mingo@...e.hu,
	joachim.eastwood@...ron.com
Subject: Re: [RFC][PATCH] irq: support IRQ_NESTED_THREAD with non-threaded 
 interrupt handlers

On Sat, 5 Jun 2010 15:56:01 +0200
Esben Haabendal <esbenhaabendal@...il.com> wrote:

> I have a board with an I2C PCA9535 chip with two PHY interrupt lines
> hooked up to. The pca953x driver calls set_irq_nested_thread on all
> irq's on initialization. The PHY driver then calls request_irq, and has
> no idea that it should actually be using a threaded handler.
> 
> With this patch, the PHY driver is able to work in this scenario
> without changes (and so should any other driver using request_irq).

You may want to give request_any_context_irq() a try (available since the
latest merge window). It still requires your driver to be changed, but it
should then work in both threaded and non-threaded cases.

	M.
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