Date: Wed, 8 Aug 2012 14:31:33 +0300 From: Konstantin Belousov <kostikbel@gmail.com> To: Hans Petter Selasky <hselasky@c2i.net> Cc: Ed Schouten <ed@80386.nl>, freebsd-current@freebsd.org Subject: Re: ttydev_cdevsw has no d_purge Message-ID: <20120808113133.GO2676@deviant.kiev.zoral.com.ua> In-Reply-To: <201208071703.13773.hselasky@c2i.net> References: <20120801160323.GN2676@deviant.kiev.zoral.com.ua> <CAJOYFBD6Xa08LXuzzYha7Ev9WDJFN5%2BHEqDJ6a2C0puFGZ4-Qg@mail.gmail.com> <201208051033.13486.hselasky@c2i.net> <201208071703.13773.hselasky@c2i.net>
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--55kmsllhnyURxeAZ Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Tue, Aug 07, 2012 at 05:03:13PM +0200, Hans Petter Selasky wrote: > On Sunday 05 August 2012 10:33:13 Hans Petter Selasky wrote: > > On Friday 03 August 2012 10:32:47 Ed Schouten wrote: > > > 2012/8/1 Hans Petter Selasky <hselasky@c2i.net>: > > > > I think the problem is like this, that in order to re-use the unit > > > > numbers for USB serial tty devices, the USB stack needs to wait unt= il a > > > > TTY is actually freed, right? Else you will have a panic on creating > > > > devfs entries having the same name. > > >=20 > > > Indeed. So the USB code could simply pick a different unit number. > >=20 > > Hi Ed, > >=20 > > USB could use a different Unit number. Some questions: > >=20 > > When can the previous unit number be re-used? Is there a callback for t= his? > >=20 > > When can the USB serial code assume that it will not be called again and > > that all callbacks are drained? > >=20 >=20 > Hi, >=20 > Can you try the attached patch and report back? I applied the patch and reloaded ucom and uplcom. So far there were no power glitches so UPS did not dropped off the bus yet. I have a question regarding the changed fragment of code. Why don't you use unr(9) KPI to manage unit numbers ? --55kmsllhnyURxeAZ Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (FreeBSD) iEYEARECAAYFAlAiThUACgkQC3+MBN1Mb4jmVQCfYHZOywd1x0Iaq0d7LckIXVKk yvAAnilWFigHaDUOzbkm4+bpr9Zj4QTl =wEwM -----END PGP SIGNATURE----- --55kmsllhnyURxeAZ--
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