From owner-freebsd-hackers@freebsd.org Sat Mar 9 19:28:36 2019 Return-Path: Delivered-To: freebsd-hackers@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 8BE8B15334A8 for ; Sat, 9 Mar 2019 19:28:36 +0000 (UTC) (envelope-from rozhuk.im@gmail.com) Received: from mail-lj1-x230.google.com (mail-lj1-x230.google.com [IPv6:2a00:1450:4864:20::230]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "GTS CA 1O1" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id E7D066F08B for ; Sat, 9 Mar 2019 19:28:35 +0000 (UTC) (envelope-from rozhuk.im@gmail.com) Received: by mail-lj1-x230.google.com with SMTP id d14so754016ljl.9 for ; Sat, 09 Mar 2019 11:28:35 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:date:to:cc:subject:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=ASIRQ+rXHp3Y/pFm1CLL1O/yDFyfVNzdlP2/UTzs3w4=; b=mO4Z1mneEYhpBIAurcsCfEx+1AbPLAa0dSeWHv0kkxJhEk8mH59B0KBw83Xb5o8pCl EL0/jNliAp8w5wDlbej8D9cfaCqXy65sCJiOTvpStGQWW7/DGYxbN7MiQkHoZvXW8A/A cIg4yf/hcVvFWzf6VZysqtN5I7Db6MUCCORwD/OWb/tBnumE7andxhRmpYfpQLUAZ/Gy +UpQY5nS0J02f6rxiuwDgJBFqx0FBUSZy4mbRBuuTVW42ZZ99guun6D1+zB60eMjojr8 IZYGb14EcW+jzrDWyucJgyTm+H0MFd6cdKgSEcOb9RFeKy1kn7hqPXy0tvv5wsZ/jQNQ P1vg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:date:to:cc:subject:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=ASIRQ+rXHp3Y/pFm1CLL1O/yDFyfVNzdlP2/UTzs3w4=; b=axMGInJ0kUUaAEhFqahYQynl4t26lEPT6I/zeb0n8PjVLw8GaCC8r5aCP+n2LgEdop f6YDVqyvc52T/GkRslCnMzGxt5ArjHFc9+oI4iQkWSckDgEtToKu9debRNuYmZYy6Sqh qZuDznFhA4jrTks2lavsFvrd8mgB2+KhsYDrT/Szj4y1kWoJwBY/Bk5iUP3p9YJpUwhr ugtij0aHp6iXiXW62GeSNCekMXU41EHyz46wwqxxcB2JIAXmHdQS7rFwawVnP3n3TY/G AtdzYF6e+BSRcZIrQIO32qoU0czDcuEQeUgP6R7eRyZKSd1QToJOyqpwjxHOaQc+X/wr tYIA== X-Gm-Message-State: APjAAAXgCQlI0Bq8pst3uFUW/BVYMny394Wz9eWdWoaO0RrUnYp54ghs vLz1kfwJizwcLRjjngDEscI= X-Google-Smtp-Source: APXvYqxqY5y6S+5iqPw7lpdAkyqEy4rWoN9V3ytW/Y9XESJqSTN77lBBgeqG/hmWtUAo+sMzgJpU1g== X-Received: by 2002:a2e:7314:: with SMTP id o20mr12478741ljc.111.1552159714347; Sat, 09 Mar 2019 11:28:34 -0800 (PST) Received: from rimwks ([2001:470:1f15:3d8:7285:c2ff:fe43:675b]) by smtp.gmail.com with ESMTPSA id m1sm287795lfh.36.2019.03.09.11.28.33 (version=TLS1_3 cipher=AEAD-AES256-GCM-SHA384 bits=256/256); Sat, 09 Mar 2019 11:28:33 -0800 (PST) From: Rozhuk Ivan X-Google-Original-From: Rozhuk Ivan Date: Sat, 9 Mar 2019 22:28:27 +0300 To: Konstantin Belousov Cc: Hans Petter Selasky , FreeBSD Hackers , "O'Connor, Daniel" Subject: Re: USB stack getting confused Message-ID: <20190309222827.5407ddbf@rimwks> In-Reply-To: <20190309162640.GN2492@kib.kiev.ua> References: <3B29D870-41F9-46AF-B9F3-03106DEC417D@dons.net.au> <20190309152613.GM2492@kib.kiev.ua> <20190309162640.GN2492@kib.kiev.ua> X-Mailer: Claws Mail 3.17.3 (GTK+ 2.24.32; amd64-portbld-freebsd12.0) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: E7D066F08B X-Spamd-Bar: ------ Authentication-Results: mx1.freebsd.org X-Spamd-Result: default: False [-7.00 / 15.00]; NEURAL_HAM_MEDIUM(-1.00)[-1.000,0]; NEURAL_HAM_SHORT(-1.00)[-0.997,0]; REPLY(-4.00)[]; TAGGED_FROM(0.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000,0] X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 09 Mar 2019 19:28:36 -0000 On Sat, 9 Mar 2019 18:26:40 +0200 Konstantin Belousov wrote: > In fact I saw something similar with apcupsd and either usb/com > adapters or native usb control card for APC UPSes. For reasons I do > not understand, these devices are often disconnected. For older > versions of apcupsd, it required restart for newly reattached device > to be recreated in /dev. Sometimes it hangs whole usb stack. > > Newer apcupsd seems to open /dev/ugen only for the duration of the > query, which makes the erratic behaviour is much less likely, but > could still cause breakage when device disappear while apcupsd has it > opened. > Same problem with usb sound cards. I try to fix it, but fail with dsp, only mixer can be fixed with small code change. https://reviews.freebsd.org/D11140