Commits on Jun 21, 2013

1. dwc_otg: Call usb_hcd_unlink_urb_from_ep with lock held in completion… …

   … handler
   
   usb_hcd_unlink_urb_from_ep must be called with the HCD lock held.  Calling it
   asynchronously in the tasklet was not safe (regression in
   c4564d4).
   
   This change unlinks it from the endpoint prior to queueing it for handling in
   the tasklet, and also adds a check to ensure the urb is OK to be unlinked
   before doing so.
   
   NULL pointer dereference kernel oopses had been observed in usb_hcd_giveback_urb
   when a USB device was unplugged/replugged during data transfer.  This effect
   was reproduced using automated USB port power control, hundreds of replug
   events were performed during active transfers to confirm that the problem was
   eliminated.

   

   wmdb committed Jun 21, 2013
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