Date: Sun, 07 Sep 2014 09:10:48 +0200 From: Hans Petter Selasky <hps@selasky.org> To: Poul-Henning Kamp <phk@phk.freebsd.dk> Cc: freebsd-hackers@freebsd.org, Maxim V FIlimonov <che@bein.link> Subject: Re: What to do if USB stack seems dead Message-ID: <540C04F8.2000703@selasky.org> In-Reply-To: <33743.1410072134@critter.freebsd.dk> References: <1455331.JKPkSxLmbq@quad> <540B7AC4.9060504@selasky.org> <33743.1410072134@critter.freebsd.dk>
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On 09/07/14 08:42, Poul-Henning Kamp wrote: > -------- > In message <540B7AC4.9060504@selasky.org>, Hans Petter Selasky writes: >> On 09/06/14 21:57, Maxim V FIlimonov wrote: >>> Lately, I've been heavily experimenting with different USB devices (for >>> instance, USB to TTL one, but that's another story), and at a moment I >>> encountered that the system doesn't react on new USB devices connected. The >>> connected devices work fine, though. The question is: what can I do in such a >>> case if I don't want to reboot my box? >>> >> >> Hi, >> >> If a TTY port is not closed, it will prevent other USB devices on that >> particular USB controller from enumerating. > > I'm pretty sure I have seen this "dead USB" thing on > > FreeBSD ni.freebsd.dk 11.0-CURRENT FreeBSD 11.0-CURRENT #3 r270830: > > without any USB/TTY ports being involved at all... > Hi, If it is a USB SW problem, you should see that the USB explore / RootHub threads are stuck. Else it is a USB HW problem. --HPS
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