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We should not be allowing a timeout to reset when a drain is in progress on

Description

We should not be allowing a timeout to reset when a drain is in progress on
it (either async or sync drain).

At this moment the only user of drain is TCP, but TCP wouldn't reschedule a
callout after it has drained it, since it drains only when a tcpcb is closed.
This for now the problem isn't observed.

Submitted by: rrs

Details

Provenance
glebiusAuthored on
Parents
rS304243: bhnd(4): Implement NVRAM support required for PMU bring-up.
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