Date: Mon, 24 Jun 2002 16:36:51 -0400 (EDT) From: "Matthew N. Dodd" <winter@jurai.net> To: "M. Warner Losh" <imp@village.org> Cc: arch@FreeBSD.ORG Subject: Re: It is time to admit that removable devices exist Message-ID: <20020624163116.J95270-100000@sasami.jurai.net> In-Reply-To: <20020623.171200.96231110.imp@village.org>
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On Sun, 23 Jun 2002, M. Warner Losh wrote: > Please find enclosed the beginnings of a patch to make removable devices > better represented in the system. Right now all it adds is a mechanism > by which client drivers can ask if the device is still really there or > not. If a device driver is ever in a position to ask this question when a device is not actually present then we've got larger issues. I don't think this is the correct solution; adding function calls to all the interrupt handlers is broken, especially since PCMCIA doesn't really support hot removal of devices anyway. No other OS supports this correctly either. I suggest that you implement a PCMCIA/CARDBUS specific BUS_SETUP_INTR method that performs whatever check is needed before calling the driver interrupt handler. We should also implement 'ifconfig detach/unplumb/destroy' as an interface for forcing network devices (the most common hot removed device) to be detached. This will allow users to completely detach the device before they remove it. -- | Matthew N. Dodd | '78 Datsun 280Z | '75 Volvo 164E | FreeBSD/NetBSD | | winter@jurai.net | 2 x '84 Volvo 245DL | ix86,sparc,pmax | | http://www.jurai.net/~winter | For Great Justice! | ISO8802.5 4ever | To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-arch" in the body of the message
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