Ian Lepore 0eba88cf91 Allow dcons(4) to be unloaded when loaded as a module. ... When the module is unloaded, the tty devices are destroyed. That requires implementing the tsw_free callback to avoid a panic. This driver requires no particular cleanup to be done from the callback, but the module itself must remain in memory until the deferred tsw_free callbacks are invoked. These changes implement that by incrementing a reference count variable in the detach routine, and decrementing it in the tsw_free callback. The MOD_UNLOAD event handler doesn't return until the count drops to zero. PR: 237758		2019-05-10 02:30:16 +00:00
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dcons_crom.c
dcons_os.c	Allow dcons(4) to be unloaded when loaded as a module.	2019-05-10 02:30:16 +00:00
dcons_os.h
dcons.c
dcons.h