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Sat, 09 Mar 2019 14:56:11 -0800 (PST) Received: from rimwks ([2001:470:1f15:3d8:7285:c2ff:fe43:675b]) by smtp.gmail.com with ESMTPSA id u18sm338516lfd.15.2019.03.09.14.56.10 (version=TLS1_3 cipher=AEAD-AES256-GCM-SHA384 bits=256/256); Sat, 09 Mar 2019 14:56:10 -0800 (PST) From: Rozhuk Ivan X-Google-Original-From: Rozhuk Ivan Date: Sun, 10 Mar 2019 01:56:08 +0300 To: Hans Petter Selasky Cc: Konstantin Belousov , FreeBSD Hackers , "O'Connor, Daniel" Subject: Re: USB stack getting confused Message-ID: <20190310015608.4d32e14f@rimwks> In-Reply-To: References: <3B29D870-41F9-46AF-B9F3-03106DEC417D@dons.net.au> <20190309152613.GM2492@kib.kiev.ua> <20190309162640.GN2492@kib.kiev.ua> <20190309222827.5407ddbf@rimwks> 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: 0D21877E9C X-Spamd-Bar: ------ Authentication-Results: mx1.freebsd.org; dkim=pass header.d=gmail.com header.s=20161025 header.b=dPgKmX5D; 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PREVIOUSLY_DELIVERED(0.00)[freebsd-hackers@freebsd.org]; TO_MATCH_ENVRCPT_SOME(0.00)[]; RCVD_IN_DNSWL_NONE(0.00)[0.3.1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.2.0.0.4.6.8.4.0.5.4.1.0.0.a.2.list.dnswl.org : 127.0.5.0]; IP_SCORE(-2.76)[ip: (-9.34), ipnet: 2a00:1450::/32(-2.32), asn: 15169(-2.06), country: US(-0.07)]; MID_RHS_NOT_FQDN(0.50)[]; FREEMAIL_CC(0.00)[gmail.com] 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 22:56:15 -0000 On Sat, 9 Mar 2019 22:40:02 +0100 Hans Petter Selasky wrote: > > 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 > > > > Hi, > > How will these apps detect that they need to open the new /dev/mixer > node? > > I mean, after hang is fixed, mixer app will still try to query the > old file handle forever? > Main problem for me is: usb device lost/reconnected, new device connected, but FreeBSD does nothink because USB stack hang - it wait for all fd closed for mixer and dsp. Apps can be rewrited/pathed: on dev lost - get error on operations with fd, then try to reopen it. I dont remember now how that work in patch, it is undone. Another OSS issue - apps do not react on hw.snd.default_unit change. I mitigate reconnect issue in hardware: - switch to sound via HDMI - add real LC filter to home power line: I have long USB link from PC to work place USB HUB with kb, mouse, usb sound ...,and every time after refregerator start/stop I got lost USB link to hub, LC filter fix this. After that kb, mouse and other usb devices does not replug untill I close all apps that have opened fd from mixer and dsp.