Re: when does a PDO become a PDO ?
From: Mark Roddy (markr_at_hollistech.com)
Date: 08/10/04
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Date: Mon, 9 Aug 2004 20:54:24 -0400
Like I said, and as you are now also hearing from other quarters: you have
designed yourself into a corner. If the stack cannot be stopped then you
cannot reliably insert or remove a filter. Those are the current
constraints. Stopping or rebooting is currently the only reliable solution.
-- ===================== Mark Roddy Windows 2003/XP/2000 Consulting Hollis Technology Solutions 603-321-1032 www.hollistech.com markr@hollistech.com "shahar" <shahar@discussions.microsoft.com> wrote in message news:A8FBCF0A-43D4-4804-9946-5CC373BEC9C5@microsoft.com... >I don't want to stop the device from the same reason I don't want to force >a > reboot: > My product installation must not disturb the user in any way. > > What is wrong with attaching to the top of a started device stack ? > > "Eliyas Yakub [MSFT]" wrote: > >> >Are you saying that there is no safe way to install a bus filter on a >> running system ? >> >> It depends on whether the device can be stopped (query-removed) at >> runtime >> and restarted. In order to insert the filter, the device stack has to be >> torn down and rebuilt. If the device cannot be stopped at runtime then >> setup >> the registry and reboot the system so that the filter gets loaded as part >> of >> the bus driver function stack. >> >> -- >> -- >> -Eliyas >> This posting is provided "AS IS" with no warranties, and confers no >> rights. >> http://www.microsoft.com/whdc/driver/default.mspx >> http://www.microsoft.com/whdc/driver/kernel/KB-drv.mspx >> >> >> >> "shahar" <shahar@discussions.microsoft.com> wrote in message >> news:69482572-E29E-4B12-84C4-56F83052A524@microsoft.com... >> > Even if I will find a sollution for attaching to the device stack >> > before >> it >> > starts I will still have to deal with a scenario where the device stack >> > is >> > already started because this will surely be the case when my product is >> first >> > installed on a computer (I do not want to force a restart when my >> > product >> is >> > installed). >> > >> > Are you saying that there is no safe way to install a bus filter on a >> > running system ? >> > >> > "Mark Roddy" wrote: >> > >> > > Comments inline. >> > > >> > > -- >> > > >> > > ===================== >> > > Mark Roddy >> > > Windows 2003/XP/2000 Consulting >> > > Hollis Technology Solutions 603-321-1032 >> > > www.hollistech.com >> > > markr@hollistech.com >> > > >> > > >> > > "shahar" <shahar@discussions.microsoft.com> wrote in message >> > > news:92B29FF6-842C-4A8C-A87D-05DCFF733E7D@microsoft.com... >> > > > My product is attaching to a very specific type of bus. I only >> > > > attach >> to >> > > > the >> > > > device stack after I am informed by a pnp notification I registered >> > > > (IoRegisterPnpNotification) for a device interface that this >> > > > specific >> bus >> > > > registers. >> > > >> > > Like I said, this is the wrong approach. You have designed yourself >> > > into >> a >> > > corner here. >> > > >> > > > Since I will be notified only after the device completes it's >> > > > IRP_MN_START_DEVICE, it is not possible for me to be there before >> that, >> > > > thus >> > > > I am forced to do things this way. >> > > > >> > > > Is there another way to check if the pnp knows about the PDO ? >> > > > >> > > >> > > Not that I know of. Go back and rethink how you are attaching to the >> > > bus >> > > driver FDO. >> > > >> > > > "Mark Roddy" wrote: >> > > > >> > > >> Attaching to the bus FDO 'long after it started' is a design flaw >> > > >> you >> > > >> ought >> > > >> to fix. Make your inquiries when you see a start device for the >> > > >> PDO >> in >> > > >> question, as that will guarantee that the PDO is in fact a PDO. >> > > >> >> > > >> I have no idea why Microsoft bugchecks on an invalid PDO rather >> > > >> than >> > > >> returning an error. I suppose it is a gentle warning that you are >> doing >> > > >> things the wrong way :-) >> > > >> >> > > >> -- >> > > >> >> > > >> ===================== >> > > >> Mark Roddy >> > > >> Windows 2003/XP/2000 Consulting >> > > >> Hollis Technology Solutions 603-321-1032 >> > > >> www.hollistech.com >> > > >> markr@hollistech.com >> > > >> >> > > >> >> > > >> "shahar" <shahar@discussions.microsoft.com> wrote in message >> > > >> news:65D27172-9DA8-4938-B31D-28E9BFEB5026@microsoft.com... >> > > >> >I am writing a bus filter and I would like to call functions >> > > >> >like: >> > > >> > IoGetDeviceProperty, IoQueryDevicePnpState and >> > > >> > IoRequestDeviceEject >> > > >> > on pdo's that my filter sees in IRP_MN_QUERY_DEVICE_RELATIONS >> queries >> > > >> > that >> > > >> > are sent to the bus I'm filtering. >> > > >> > The problem is that I attach to the bus long after it is started >> and I >> > > >> > can't >> > > >> > know if this is the first time that the pdo is reported or if it >> was >> > > >> > reported >> > > >> > a long time ago and maybe even started already. >> > > >> > Calling any of the functions I mentioned on a PDO that was not >> reported >> > > >> > to >> > > >> > the pnp manager yet will generate a bugcheck. >> > > >> > My questions is: How can I know if the pnp manager already knows >> about >> > > >> > the >> > > >> > PDO ? when exactly is it alright to call those functions with >> > > >> > the >> pdo ? >> > > >> > I will also be very glad if someone can explain why do those >> functions >> > > >> > bugcheck when using an uninitialized pdo instead of just >> > > >> > returning >> with >> > > >> > a >> > > >> > failed status. >> > > >> > >> > > >> > Thank you, >> > > >> > Shahar. >> > > >> >> > > >> >> > > >> >> > > >> > > >> > > >> >> >>
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