Date: Mon, 31 Jan 2000 23:10:16 +0000 (GMT) From: Doug Rabson <dfr@nlsystems.com> To: "Matthew N. Dodd" <winter@jurai.net> Cc: Mike Smith <msmith@freebsd.org>, Nikolai Saoukh <nms@ethereal.ru>, freebsd-current@freebsd.org Subject: Re: kldloaded driver not called at load time Message-ID: <Pine.BSF.4.05.10001312305160.87495-100000@herring.nlsystems.com> In-Reply-To: <Pine.BSF.4.21.0001311716500.479-100000@sasami.jurai.net>
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On Mon, 31 Jan 2000, Matthew N. Dodd wrote: > On Mon, 31 Jan 2000, Mike Smith wrote: > > This is because the unknown driver is never revoked once it owns your > > device. It's a(nother) bug in the ISA bus code. 8( > > Looking at the code in sys/kern/subr_bus.c I'm not sure how any drivers > are revoked by a higher priority match. > > This is probably desirable given the nature of most drivers and one of the > reasons for letting BUS_PROBE_NOMATCH announce your 'unknown' hardware. > > If a driver is attached and providing interfaces to the system (network, > scsi, what have you.) then loading a higher priority driver shouldn't > cause that device to detach as it would potentially cause the system to > become confused. > > I never liked the unknown driver. I vote we kill it and let > isa_probe_nomatch() deal with things. (I'll have to write > isa_probe_nomatch() but I don't see that as a problem.) > > Nikolai, your easy fix is to comment out the relevent module declaration > for the 'unknown' driver in isa_common.c. This is probably the right workaround for now. The unknown driver does serve a purpose. It indirectly allows resources associated with the device to be allocated so that other PnP devices are not allocated on top. On reviewing the code, this seems to happen (in isa_probe_children) whether or not the preceding call to device_probe_and_attach() succeeded so removing the unknown driver would mean that resources are allocated for the un-attached device which is likely to cause trouble. -- Doug Rabson Mail: dfr@nlsystems.com Nonlinear Systems Ltd. Phone: +44 181 442 9037 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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