K 10
svn:author
V 3
imp
K 8
svn:date
V 27
2018-05-15T22:22:10.288245Z
K 7
svn:log
V 474
Hold the reference count until the CCB is released

When a disk disappears and the periph is invalidated, any I/Os that
are pending with the controller can cause a crash when they
complete. Move to holding the softc reference count taken in dastart()
until the I/O is complete rather than only until xpt_action()
returns. (This approach was suggested by Ken Merry.) This extends
the method used in da to ada, nda, and mda.

Sponsored by: Netflix
Submitted by: Chuck Silvers

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