linux-kernel - Re: [PATCH v2 5/7] [PATCH 5/8] can: SJA1000 generic platform bus driver

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Message-ID: <4A0D6A39.2000104@grandegger.com>
Date:	Fri, 15 May 2009 15:12:25 +0200
From:	Wolfgang Grandegger <wg@...ndegger.com>
To:	Sascha Hauer <s.hauer@...gutronix.de>
CC:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	Marc Kleine-Budde <mkl@...gutronix.de>,
	Oliver Hartkopp <oliver.hartkopp@...kswagen.de>
Subject: Re: [PATCH v2 5/7] [PATCH 5/8] can: SJA1000 generic platform bus
 driver

Sascha Hauer wrote:
> On Fri, May 15, 2009 at 11:35:06AM +0200, Wolfgang Grandegger wrote:
>> Hi Sascha,
>>
>> Sascha Hauer wrote:
>>> Hi Wolfgang,
[...}
>>>> +	irq = res_irq->start;
>>>> +	if (res_irq->flags & IRQF_TRIGGER_MASK)
>>>> +		set_irq_type(irq, res_irq->flags & IRQF_TRIGGER_MASK);
>>> You shouldn't use set_irq_type on not yet requested irqs but instead
>>> pass the flags to the real driver and pass them in request_irq.
>> Why? I would require an extra member in the struct sja1000_priv.
> 
> You change a resource you do not own. What if request_irq returns with
> -EBUSY? You already screwed up any other potential user.

OK, I added irq_flags to struct sja1000_priv, which  will then be used
by the request_irq(). The driver must to set it appropriately, including
IRQF_SHARED. This also fixes the problem, that drivers used IRQF_SHARED
without reason.

Thanks,

Wolfgang.
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