[Bug 220240] sys/dev/xl/if_xl.c: A possible sleep-under-mutex bug in xl_list_rx_init

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=220240

            Bug ID: 220240
           Summary: sys/dev/xl/if_xl.c: A possible sleep-under-mutex bug
                    in xl_list_rx_init
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: baijiaju1990 at 163.com

The driver may sleep under a mutex, and the function call path is:
xl_resume [acquire the mutex]
  xl_init_locked
    xl_list_rx_init
      bus_dmamap_create(BUS_DMA_WAITOK) --> may sleep

The possible fix of this bug is to replace the "BUS_DMA_WAITOK" in
bus_dmamap_create with "BUS_DMA_NOWAIT".

This bug is found by a static analysis tool written by myself, and it is
checked by my review of the FreeBSD code.

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