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git2svn
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2021-04-06T15:21:43.276490Z
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V 310
Lock busdma operations and serialize detach against open/close

Use sx to allow M_WAITOK allocations (suggested by markj).

admbugs: 782
Reviewed by:	markj

(cherry picked from commit 9f011bca829751ed3552ac94fe7c865d75fabfc4)

Git Hash:   bd422989a99b5acbc1017945a115f111ac81c131
Git Author: marcel@FreeBSD.org
END