Hello!
> Well, the USB ACM driver does just tty_flip_buffer_push() from an
> interrupt, which I think is normal even for other drivers? Well, if not,
> I can change it ...
>
> Hmm, it also calls a tty->ldisc.write_wakeup from an interrupt. Might
> this be the cause?
It is interesting. Why does it not overrun in this case?
Common serial card will surely overrun, when pushing data block
from its own irq.
Yes, this work should be done from bh. And if internal card buffer
is less than flip buffer, it must be done from bh.
Alexey
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