[PATCH] synchronize_irq needs a barrier

[Benjamin Herrenschmidt]

On Sat, 2007-10-20 at 08:06 +0200, Maxim Levitsky wrote:

> 	/* Disable interrupts, DMA, and rest of the chip*/
> 	saa_writel(SAA7134_IRQ1, 0);
> 	saa_writel(SAA7134_IRQ2, 0);
> 	saa_writel(SAA7134_MAIN_CTRL, 0);
	
> 	dev->insuspend = 1;
> 	synchronize_irq(pci_dev->irq);
> 
> 	/* ACK pending interrupts just in case*/
> 	saa_writel(SAA7134_IRQ_REPORT,saa_readl(SAA7134_IRQ_REPORT));
> 
> 	......
> This should be bullet-proof.

Hopefully :-)

Cheers,
Ben.