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ucom(4): Make sure the open routine is executed synchronously.

Description

ucom(4): Make sure the open routine is executed synchronously.

To avoid issues starting any USB transfers before the open
function is complete.

Differential Revision: https://reviews.freebsd.org/D36391
Sponsored by: NVIDIA Networking

(cherry picked from commit cbc5350359b9be916cc0dc1986147013c6f90483)

Details

Provenance
daveb_spectralogic.comAuthored on Aug 30 2022, 2:19 PM
hselaskyCommitted on Sep 6 2022, 8:43 AM
Differential Revision
D36391: Enable umodem clear stall on open
Parents
rGeadbe9faeb57: rtld(1): Fix a typo in a source code comment
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