[Xen-devel] [PATCH]UHC should not generate interrupt when USB device returns NAK

["Huang, Xinmei" <xinmei.huang@xxxxxxxxx>]

This patch adds support for USB mouse/tablet status check and restricts
Universal Host Controller interrupt generating when received NAK in
interrupt transfer.

According to usb spec, USB mouse/tablet device returns NAK to host
controller if its status does not alter in interrupt transfer.
And UHC should leave a TD active when receiving NAK and execute this
incompleted TD in a subseqent frame. 
UHC only generates an interrupt on complete after the TD with ICO bit=1
is completed.

This patch obliges UHC & USB mouse/tablet to behave consistently with
spec.


Signed-off-by: Xinmei Huang <xinmei.huang@xxxxxxxxx>

Attachment: usb.uhci.patch
Description: usb.uhci.patch

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