On Tue, 1 Oct 2002, David McIlwraith wrote:
> Semaphores may sleep - therefore, they cannot be used from a 'non-sleep'
> context.
Yes, sure. Sorry if I wasn't clear enough - the point is whether those
tty_driver write/write_room() calls are allowed to sleep or not. If yes,
the usbserial implementation is right and it is impossible to do further
writing directly from write_wakeup() callback (which would be really bad
IMHO) - if not, usbserial needs to avoid the down() somehow.
Martin
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