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dwc_otg: implement tasklet for returning URBs to usbcore hcd layer #255

Merged
merged 1 commit into from
Mar 24, 2013
Merged

dwc_otg: implement tasklet for returning URBs to usbcore hcd layer #255

merged 1 commit into from
Mar 24, 2013

Commits on Mar 21, 2013

  1. dwc_otg: implement tasklet for returning URBs to usbcore hcd layer 

    The dwc_otg driver interrupt handler for transfer completion will spend
a very long time with interrupts disabled when a URB is completed -
this is because usb_hcd_giveback_urb is called from within the handler
which for a USB device driver with complicated processing (e.g. webcam)
will take an exorbitant amount of time to complete. This results in
missed completion interrupts for other USB packets which lead to them
being dropped due to microframe overruns.

This patch splits returning the URB to the usb hcd layer into a
high-priority tasklet. This will have most benefit for isochronous IN
transfers but will also have incidental benefit where multiple periodic
devices are active at once.
    P33M authored and P33M committed Mar 21, 2013
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