Alexander Motin 4fbbe52365 nvme: Replace potentially long DELAY() with pause().
In some cases like broken hardware nvme(4) may wait minutes for
controller response before timeout.  Doing so in a tight spin loop
made whole system unresponsive.

Reviewed by:	imp
MFC after:	1 week
Differential Revision:	https://reviews.freebsd.org/D29309
Sponsored by:	iXsystems, Inc.
2021-03-17 10:35:49 -04:00
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