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Date: Tue, 17 Sep 2013 23:03:24 +0400
From: Lev Serebryakov <lev@FreeBSD.org>
Organization: FreeBSD Project
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To: Hans Petter Selasky <hans.petter.selasky@bitfrost.no>
Subject: Re: umcs (4-Port-USB-serial) triggering way too much ehci IRQs
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Cc: Harald Schmalzbauer <h.schmalzbauer@omnilan.de>,
 FreeBSD Stable <freebsd-stable@FreeBSD.org>, freebsd-usb@FreeBSD.org
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Hello, Hans.
You wrote 17 =D1=81=D0=B5=D0=BD=D1=82=D1=8F=D0=B1=D1=80=D1=8F 2013 =D0=B3.,=
 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=20
HPS> transfers from the USB interrupt transfer callback. This should be=20
HPS> postponed into some worker thread, for example the USB explore thread.=
=20
HPS> See USB audio driver for an example.
 I've copied code from some other ucom driver... I'll take a look at USB
audio.

--=20
// Black Lion AKA Lev Serebryakov <lev@FreeBSD.org>