linux-kernel - Re: [RFC] [PATCH 02/62] mpu401:snd_mpu401_uart_new(): split semantic of irq

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Message-ID: <4E689E9A.8000407@ladisch.de>
Date:	Thu, 08 Sep 2011 12:53:14 +0200
From:	Clemens Ladisch <clemens@...isch.de>
To:	Yong Zhang <yong.zhang0@...il.com>
CC:	linux-kernel@...r.kernel.org, tglx@...utronix.de, mingo@...e.hu,
	Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.de>,
	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>, Jiri Kosina <jkosina@...e.cz>,
	Andreas Mohr <andi@...as.de>,
	Lucas De Marchi <lucas.demarchi@...fusion.mobi>,
	Julia Lawall <julia@...u.dk>,
	Ondrej Zary <linux@...nbow-software.org>,
	Dan Carpenter <error27@...il.com>,
	Joe Perches <joe@...ches.com>, alsa-devel@...a-project.org
Subject: Re: [RFC] [PATCH 02/62] mpu401:snd_mpu401_uart_new(): split semantic
 of irq_flags

Yong Zhang wrote:
> Now snd_mpu401_uart_new() parameter 'irq_flags' take two role
> in it: one is the condition to request_irq and the other is
> the real irq_flags which will be transfered to request_irq().
> 
> So add another parameter 'want_irq' to take the role of the
> first one, this will make it easy to remove IRQF_DISABLED.

Please note that the irq number is also intended to pass this
information:

>   * @irq: the irq number, -1 if no interrupt for mpu
> ...
> -	if (irq >= 0 && irq_flags) {
>  		if (request_irq(irq, snd_mpu401_uart_interrupt, irq_flags,

Of course, most of snd_mpu401_uart_new()'s users get this wrong and use
0 instead of -1, relying on the irq_flags parameter only.  But if these
are fixed to use irq == -1, we get the same effect without having to
introduce another parameter.


Regards,
Clemens
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