[PATCH] synchronize_irq needs a barrier

[Herbert Xu]

On Sat, Oct 20, 2007 at 02:02:42AM +0000, Maxim Levitsky wrote:
>
> Thus I now understand that .suspend() should do:
> 
> 	saa_writel(SAA7134_IRQ1, 0);
> 	saa_writel(SAA7134_IRQ2, 0);
> 	saa_writel(SAA7134_MAIN_CTRL, 0);
> 
> 	dev->insuspend = 1;
> 	smp_wmb();

If we patch synchronize_irq() as discussed here then you can
use it in place of smp_wmb() and remove the smp_rmb from the
interrupt handler (the latter is the path that matters).

Cheers,
-- 
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