Date: Sat, 9 Mar 2019 22:40:02 +0100 From: Hans Petter Selasky <hps@selasky.org> To: Rozhuk Ivan <rozhuk.im@gmail.com>, Konstantin Belousov <kostikbel@gmail.com> Cc: FreeBSD Hackers <freebsd-hackers@freebsd.org>, "O'Connor, Daniel" <darius@dons.net.au> Subject: Re: USB stack getting confused Message-ID: <e2f04e0b-0f52-686a-5253-caa25a498182@selasky.org> In-Reply-To: <20190309222827.5407ddbf@rimwks> References: <E0371188-FD0A-47E1-8378-40239F5C6622@dons.net.au> <f3e6e30b-8b62-546b-2b51-e841f2e645bd@selasky.org> <3B29D870-41F9-46AF-B9F3-03106DEC417D@dons.net.au> <20190309152613.GM2492@kib.kiev.ua> <ea6e2690-1ad7-6c06-49e5-c528013f26c0@selasky.org> <20190309162640.GN2492@kib.kiev.ua> <20190309222827.5407ddbf@rimwks>
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On 3/9/19 8:28 PM, Rozhuk Ivan wrote: > On Sat, 9 Mar 2019 18:26:40 +0200 > Konstantin Belousov <kostikbel@gmail.com> 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 > 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? --HPS
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