Date: Fri, 22 Jan 1999 11:41:58 -0800 From: Mike Smith <mike@smith.net.au> To: Nate Williams <nate@mt.sri.com> Cc: Mike Smith <mike@smith.net.au>, "Gary T. Corcoran" <garycor@home.com>, mobile@FreeBSD.ORG Subject: Re: Reclaiming irqs for unsupported PCI hardware? Message-ID: <199901221941.LAA00993@dingo.cdrom.com> In-Reply-To: Your message of "Fri, 22 Jan 1999 12:40:04 MST." <199901221940.MAA22323@mt.sri.com>
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> > > > > > Sure it does. IRQ's are no longer generated on that piece of hardware, > > > but it's possible that the IRQ routine was in the middle of processing > > > the previous (valid) IRQ that was generated 'just prior' to the removal. > > > > Uh, it's also possible for the removal itself to generate an interrupt > > - I had this 100% repeatable on the Sharp I used to use. > > Right, but this does not work reliably on all PCIC controllers. It > works on mine, but I know a number of controllers it does not work on > (for whatever reason). Sorry, you're missing my point - the removal causes a *card* interrupt, not a PCIC interrupt. > > > > In other words, just make sure mobile users know they _must_ > > > > shutdown a card before removing it, and forget about trying to handle > > > > stupid (or accidental) user actions. > > > > > > The use of the IRQ makes it less painful *IF* the user yanks their > > > card. Is it worth making it easier? I don't know. > > > > That's it in a nutshell. > > You got it. If we've got the IRQ, we *can* make it safer. But, it > doesn't work reliably on some hardware, and it 'wastes' an interrupt > that might otherwise be used for something else. (I'm using the term > 'waste' loosely here, since I think it makes the system more robust..) Understood. Hmm. -- \\ Sometimes you're ahead, \\ Mike Smith \\ sometimes you're behind. \\ mike@smith.net.au \\ The race is long, and in the \\ msmith@freebsd.org \\ end it's only with yourself. \\ msmith@cdrom.com To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-mobile" in the body of the message
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