cxgb3 - fix race in EEH

commit 0ca41c0413a4d9ca58767d53d23accea9aa1cdef upstream.

A SGE queue set timer might access registers while in EEH recovery,
triggering an EEH error loop. Stop all timers early in EEH process.

Signed-off-by: Divy Le Ray <divy@chelsio.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Cc: Karsten Keil <kkeil@novell.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>