Re: Erratum in Walter Oney's book "Programming the MS Windows Driver Model" 2nd Ed.
From: Alexander Grigoriev (alegr_at_earthlink.net)
Date: 07/21/04
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- In reply to: Martin Harvey \(work\): "Erratum in Walter Oney's book "Programming the MS Windows Driver Model" 2nd Ed."
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Date: Wed, 21 Jul 2004 08:48:25 -0700
You should set STATUS_SUCCESS if you handle QUERY_DEVICE_TEXT and its
subcode in your PDO. If the subcode is unknown, you should simply complete
the IRP, as all other IRPs you don't handle.
"Martin Harvey (work)" <m.harvey@nospam.snellwilcox.com> wrote in message
news:uyCNPfybEHA.644@tk2msftngp13.phx.gbl...
> Hi folks,
>
> Just a quick check to see whether anyone else has found this, and agrees
> that it's just a typo:
>
> I've been developing a multifunction driver in accordance with the
> principles laid out in Walter's book, which I am finding to be a very
clear
> and useful volume. However, there does appear to be a small error in
it....
> In Chapter 11, where it discusses handling of PnP requests dependent on
> whether the IRP concerns the FDO or PDO, Table 11-1 indicates that the
> "succeed" action should be taken for IRP_MN_QUERY_DEVICE_TEXT when handled
> for a PDO.
>
> When I tried this with the verifier running, a bugcheck ensued:
>
> WDM DRIVER ERROR: [xxxxxx.sys @ 0xF052BF70] Caller has changed the status
>
> field of an IRP it does not understand (Irp = 820EAF48 ).
>
> IRP_MJ_PNP.IRP_MN_QUERY_DEVICE_TEXT(Bogus)
>
>
> I then took the time to install the examples that come with the book, and
> noticed that the MULFUNC example actually performs the "ignore" action, so
> I'm assuming that this is just a typo in the book?
>
> MH.
>
>
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