umcs (4-Port-USB-serial) triggering way too much ehci IRQs
lev at FreeBSD.org
Tue Sep 17 19:03:42 UTC 2013
You wrote 17 сентября 2013 г., 13:24:26:
HPS> Try this patch and see what happens:
It could throttle interrupts, but it doesn't explain, why device spams with
interrupts when all ports are closed and all UART interrupts are disabled!
HPS> BTW: I see that the umcs driver shouldn't do synchronous control
HPS> transfers from the USB interrupt transfer callback. This should be
HPS> postponed into some worker thread, for example the USB explore thread.
HPS> See USB audio driver for an example.
I've copied code from some other ucom driver... I'll take a look at USB
// Black Lion AKA Lev Serebryakov <lev at FreeBSD.org>
More information about the freebsd-stable