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Date: Thu, 15 Mar 2012 22:39:36 +0800
From: Alex Shi <alex.shi@intel.com>
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To: Alan Stern <stern@rowland.harvard.edu>
CC: gregkh <gregkh@linuxfoundation.org>, sarah.a.sharp@linux.intel.com,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
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Subject: Re: [PATCH] usb/core: skip unnecessary line IRQ request for USB3
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> 
> This is not a good idea.  What happens if some USB-3 controller 
> (perhaps a non-xHCI USB-3 controller) doesn't use MSI?
> 


current usb3 driver just xhci. but sure it need to modify if non-xhci
usb pops up.

> The right way to avoid registering a legacy interrupt handler is to 
> call usb_add_hcd() with irqnum equal to 0.


a good trick! will try it tomorrow.

> 
> Alan Stern
>