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From: Gary C on 22 Apr 2008 04:41
Hi,

I'm new to writing Windows drivers and already I've hit a brick wall with
what appears to be a fairly fundamental task - sending requests to a local IO
target.

I have an FDO in which I need to send requests to its local IO target, which
is a PDO created by the parent bus driver. When I call WdfRequestSend() the
driver crashes with an access violation.

The following is a code excerpt showing what I'm trying to do ...

status = WdfRequestRetrieveInputMemory (ioRequest, &inputMemory);

if (!NT_SUCCESS(status))
{
KdPrint(("Unable to retrieve input buffer for write request -
0x%x\n", status));
return status;
}

status = WdfIoTargetFormatRequestForIoctl
(ioTarget,
writeRequest,
IOCTL_MODULE_1_WRITE_DATA,
inputMemory,
NULL,
NULL,
NULL);


if (!NT_SUCCESS(status))
{
KdPrint(("Unable to format write request for I/O Target - 0x%x\n",
status));
return status;
}

WdfRequestSetCompletionRoutine (writeRequest,
ACMDrvEvtRequestWriteCompletion, NULL);

if (WdfRequestSend (writeRequest, ioTarget, WDF_NO_SEND_OPTIONS) == FALSE)
{
status = WdfRequestGetStatus(writeRequest);
KdPrint(("WdfRequestSend failed 0x%x\n",status));
return status;
}


In the code above, ioRequest is the request received by the driver,
writeRequest is a request created locally by the driver, ioTarget is the
driver's local I/O target.

Any ideas what I'm doing wrong?

I've tried various things:

1. Forwarding the received request directly to the IO target, by calling
WdfRequestFormatRequestUsingCurrentType() then WdfRequestSend() ...
driver crashes.
2. Calling WdfRequestChangeTarget() just before the send ... this returns a
STATUS_REQUEST_NOT_ACCEPTED code.
3. Creating a remote I/O target and using this to attempt to send the request
directly to the FDO at the top of the parent driver's stack ... again,
this
returns STATUS_REQUEST_NOT_ACCEPTED.

I'm stuck!

Any help or suggestions would be appreciated.

--
Gary C
From: Doron Holan [MSFT] on 22 Apr 2008 13:22
what is the output of !analyze -v when i crashes? does it crash in your
driver or the bus driver to which you are sending io?

--
Please do not send e-mail directly to this alias. this alias is for
newsgroup purposes only.
This posting is provided "AS IS" with no warranties, and confers no rights.


"Gary C" <GaryC(a)discussions.microsoft.com> wrote in message
news:91901241-99E4-4949-9CEE-1EA9865ECDDE(a)microsoft.com...
> Hi,
>
> I'm new to writing Windows drivers and already I've hit a brick wall with
> what appears to be a fairly fundamental task - sending requests to a local
> IO
> target.
>
> I have an FDO in which I need to send requests to its local IO target,
> which
> is a PDO created by the parent bus driver. When I call WdfRequestSend()
> the
> driver crashes with an access violation.
>
> The following is a code excerpt showing what I'm trying to do ...
>
> status = WdfRequestRetrieveInputMemory (ioRequest, &inputMemory);
>
> if (!NT_SUCCESS(status))
> {
> KdPrint(("Unable to retrieve input buffer for write request -
> 0x%x\n", status));
> return status;
> }
>
> status = WdfIoTargetFormatRequestForIoctl
> (ioTarget,
> writeRequest,
> IOCTL_MODULE_1_WRITE_DATA,
> inputMemory,
> NULL,
> NULL,
> NULL);
>
>
> if (!NT_SUCCESS(status))
> {
> KdPrint(("Unable to format write request for I/O Target - 0x%x\n",
> status));
> return status;
> }
>
> WdfRequestSetCompletionRoutine (writeRequest,
> ACMDrvEvtRequestWriteCompletion, NULL);
>
> if (WdfRequestSend (writeRequest, ioTarget, WDF_NO_SEND_OPTIONS) ==
> FALSE)
> {
> status = WdfRequestGetStatus(writeRequest);
> KdPrint(("WdfRequestSend failed 0x%x\n",status));
> return status;
> }
>
>
> In the code above, ioRequest is the request received by the driver,
> writeRequest is a request created locally by the driver, ioTarget is the
> driver's local I/O target.
>
> Any ideas what I'm doing wrong?
>
> I've tried various things:
>
> 1. Forwarding the received request directly to the IO target, by calling
> WdfRequestFormatRequestUsingCurrentType() then WdfRequestSend() ...
> driver crashes.
> 2. Calling WdfRequestChangeTarget() just before the send ... this returns
> a
> STATUS_REQUEST_NOT_ACCEPTED code.
> 3. Creating a remote I/O target and using this to attempt to send the
> request
> directly to the FDO at the top of the parent driver's stack ... again,
> this
> returns STATUS_REQUEST_NOT_ACCEPTED.
>
> I'm stuck!
>
> Any help or suggestions would be appreciated.
>
> --
> Gary C

From: Gary C on 23 Apr 2008 10:13
OK, I've run !analyze -v ... from the output of that it seems that the crash
is occurring in the bus driver. This gives me a bit more of a lead to go on -
I'll check what's going on within the bus driver.

Thanks for the pointer ... I'll post further on the outcome of my
investigations.

--
Gary C


"Doron Holan [MSFT]" wrote:

> what is the output of !analyze -v when i crashes? does it crash in your
> driver or the bus driver to which you are sending io?
>
> --
> Please do not send e-mail directly to this alias. this alias is for
> newsgroup purposes only.
> This posting is provided "AS IS" with no warranties, and confers no rights.
>
>
> "Gary C" <GaryC(a)discussions.microsoft.com> wrote in message
> news:91901241-99E4-4949-9CEE-1EA9865ECDDE(a)microsoft.com...
> > Hi,
> >
> > I'm new to writing Windows drivers and already I've hit a brick wall with
> > what appears to be a fairly fundamental task - sending requests to a local
> > IO
> > target.
> >
> > I have an FDO in which I need to send requests to its local IO target,
> > which
> > is a PDO created by the parent bus driver. When I call WdfRequestSend()
> > the
> > driver crashes with an access violation.
> >
> > The following is a code excerpt showing what I'm trying to do ...
> >
> > status = WdfRequestRetrieveInputMemory (ioRequest, &inputMemory);
> >
> > if (!NT_SUCCESS(status))
> > {
> > KdPrint(("Unable to retrieve input buffer for write request -
> > 0x%x\n", status));
> > return status;
> > }
> >
> > status = WdfIoTargetFormatRequestForIoctl
> > (ioTarget,
> > writeRequest,
> > IOCTL_MODULE_1_WRITE_DATA,
> > inputMemory,
> > NULL,
> > NULL,
> > NULL);
> >
> >
> > if (!NT_SUCCESS(status))
> > {
> > KdPrint(("Unable to format write request for I/O Target - 0x%x\n",
> > status));
> > return status;
> > }
> >
> > WdfRequestSetCompletionRoutine (writeRequest,
> > ACMDrvEvtRequestWriteCompletion, NULL);
> >
> > if (WdfRequestSend (writeRequest, ioTarget, WDF_NO_SEND_OPTIONS) ==
> > FALSE)
> > {
> > status = WdfRequestGetStatus(writeRequest);
> > KdPrint(("WdfRequestSend failed 0x%x\n",status));
> > return status;
> > }
> >
> >
> > In the code above, ioRequest is the request received by the driver,
> > writeRequest is a request created locally by the driver, ioTarget is the
> > driver's local I/O target.
> >
> > Any ideas what I'm doing wrong?
> >
> > I've tried various things:
> >
> > 1. Forwarding the received request directly to the IO target, by calling
> > WdfRequestFormatRequestUsingCurrentType() then WdfRequestSend() ...
> > driver crashes.
> > 2. Calling WdfRequestChangeTarget() just before the send ... this returns
> > a
> > STATUS_REQUEST_NOT_ACCEPTED code.
> > 3. Creating a remote I/O target and using this to attempt to send the
> > request
> > directly to the FDO at the top of the parent driver's stack ... again,
> > this
> > returns STATUS_REQUEST_NOT_ACCEPTED.
> >
> > I'm stuck!
> >
> > Any help or suggestions would be appreciated.
> >
> > --
> > Gary C
>
>
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