getty on g_serial (ttygs) / hotplug for gadgets

I'd like to run a getty on /dev/ttygs to allow logins over to the 
g_serial gadget. However I note a couple of issues;

When the link is not up, opening the device returns ENODEV, so the getty
respawns continuously. Also, g_serial itself logs the following each
time:

gs_open: (0,c3ffc000,c3c05320) device is not connected
gs_close: NULL port pointer

Next, if you disconnect the link while the device is open, blocking
reads don't appear to fail, so the getty (or shell or whatever) doesn't 
notice.

I think it would be useful to have g_serial (optionally) pretend to
userspace that the link was always connected; if the link is down,
discard (or buffer) written data, and fail/block reads. Does this sound
useful?


Another way to solve this would be to launch the getty when the link comes
up (and also act on link down) however I don't see any hotplug events
for this. Would it make sense to have events for this case?


thanks
Hamish
-- 
Hamish Moffatt VK3SB <[email protected]> <[email protected]>

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