linux-kernel - Re: [patch 4/5] Staging: vme: add Tundra TSI148 VME-PCI Bridge driver

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Date:	Tue, 04 Aug 2009 00:55:38 +0200
From:	Jiri Slaby <jirislaby@...il.com>
To:	martyn.welch@...anuc.com
CC:	Greg K-H <gregkh@...e.de>, linux-kernel@...r.kernel.org,
	devel@...uxdriverproject.org
Subject: Re: [patch 4/5] Staging: vme: add Tundra TSI148 VME-PCI Bridge driver

On 08/04/2009 12:50 AM, Jiri Slaby wrote:
> On 08/03/2009 11:01 PM, Greg K-H wrote:
>> +	down(&(vme_irq));
>> +
>> +	tsi148_bridge->irq[level - 1].callback[statid].func = NULL;
> 
> What if the interrupt comes now? 

On the second though, actually nothing worse than "Spurilous VME
interrupt" (if some arch doesn't reorder func and priv_data
assignments). It's not that bad, but still worth fixing.

> I think you want to switch this block
> with "Disable IRQ level" one. And take care of PCI posting (if it is not
> enough that INTEO reaches the device by a consequent INTEN read).
> 
>> +	tsi148_bridge->irq[level - 1].callback[statid].priv_data = NULL;
>> +	tsi148_bridge->irq[level - 1].count--;
>> +
>> +	/* Disable IRQ level */
>> +	if (tsi148_bridge->irq[level - 1].count == 0) {
>> +		tmp = ioread32be(tsi148_bridge->base + TSI148_LCSR_INTEO);
>> +		tmp &= ~TSI148_LCSR_INTEO_IRQEO[level - 1];
>> +		iowrite32be(tmp, tsi148_bridge->base + TSI148_LCSR_INTEO);
>> +
>> +		tmp = ioread32be(tsi148_bridge->base + TSI148_LCSR_INTEN);
>> +		tmp &= ~TSI148_LCSR_INTEN_IRQEN[level - 1];
>> +		iowrite32be(tmp, tsi148_bridge->base + TSI148_LCSR_INTEN);
>> +	}
>> +
>> +	/* Release semaphore */
>> +	up(&(vme_irq));
>> +}
> 

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