Just drop interrupt spinlock acquisition from the code.
–
Maxim Shatskih, Windows DDK MVP
StorageCraft Corporation
xxxxx@storagecraft.com
http://www.storagecraft.com
“Vered Zvi” wrote in message news:xxxxx@ntdev…
> Hello,
>
> I want to answer an IOCTL request from an ISR DPC.
>
> This is the code I’m using:
>
>
>
> VOID PLxEvtInterruptDpc(
> IN WDFINTERRUPT Interrupt,
> IN WDFDEVICE Device
> )
>
> NTSTATUS status;
> PDEVICE_EXTENSION devExt;
> WDF_REQUEST_PARAMETERS params;
> WDFREQUEST tagRequest;
>
> WdfInterruptAcquireLock( Interrupt );
>
> WDF_REQUEST_PARAMETERS_INIT(¶ms);
> status = WdfIoQueueFindRequest(devExt->IoControlQueue,
> NULL,
> NULL,
> ¶ms,
> &tagRequest);
>
> … Check is the request is an IOCTL one …
>
> WdfInterruptReleaseLock( Interrupt );
> }
>
>
> Prefast gives the following warning:
>
> The function ‘WdfIoQueueFindRequest’ is not permitted to be called at
> the current IRQ level. The current level is too high: IRQL was last set
> to 3 at line 177. The level might have been inferred from the function
> signature.
> Found in function ‘PLxEvtInterruptDpc’
>
>
> This also matched the WDF documentation.
>
> How can I call ‘WdfIoQueueFindRequest’ within an ISR DPC ?
> The reason I’m doing it is that I want to call DeviceIoControl in the
> user level to find out if an interrupt arrived and to answer this
> request in ISR DPC.
>
> When I ignored the warninig and installed the driver I got blue dump.
>
> Thanks.
>
>
>
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