This should be innocuous; I expect most folk won't notice anything
better (or worse) from this patch unless they're using Intel EHCI.

removing tasklet
     - parts of davem's patch (passing pt_regs down)
     - remove 'max_completions'
     - update cleanup after hc died
     - fix an urb unlink oops (null ptr) that happens more often this way

talking to hardware
     - fixes for some short read issues (may still be others)
	* use qtd->hw_alt_next to stop qh processing after short reads
	* detect/report short reads differently
     - longer reset timeout (it was excessively short, broke Intel)

other
     - simpler diagnostics portability to 2.4:  wrap dev_err() etc
     - urb unlink wait and non-wait unlink codepaths share most code
     - don't try ehci_stop() in interrupt context (bug from hcd layer)
     - minor stuff, including
	* some "after hc died" paths were wrong
	* verbose debug messages compile again
	* don't break error irq count