stack overflow with startio and related routines

NTDEV
1

Hi,
Can some1 clear my doubt. From the DDK documentation, the flow will be like this with a fully flooded irp device queue.

StartPacket->StartIo->StartNextPacket->StartIo->…

Won’t this result in kernel stack overflow? Some1 pls clear me his doubt :slight_smile:

Thanks,
Giri.

2

Yes, it can. Be careful calling IoStartNextPacket from StartIo.

Max

----- Original Message -----
From: Seshagiri Babu K V
To: NT Developers Interest List
Sent: Tuesday, November 19, 2002 5:55 PM
Subject: [ntdev] stack overflow with startio and related routines

Hi,
Can some1 clear my doubt. From the DDK documentation, the flow will be like this with a fully flooded irp device queue.

StartPacket->StartIo->StartNextPacket->StartIo->…

Won’t this result in kernel stack overflow? Some1 pls clear me his doubt :slight_smile:

Thanks,
Giri.

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3

You can use IoSetStartIoAttributes to avoid recursion.

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/kmarch/hh/kmarch/k104_48tu.asp

–
-Eliyas
This posting is provided “AS IS” with no warranties, and confers no rights.

“Maxim S. Shatskih” wrote in message news:xxxxx@ntdev…
Yes, it can. Be careful calling IoStartNextPacket from StartIo.

Max

----- Original Message -----
From: Seshagiri Babu K V
To: NT Developers Interest List
Sent: Tuesday, November 19, 2002 5:55 PM
Subject: [ntdev] stack overflow with startio and related routines

Hi,
Can some1 clear my doubt. From the DDK documentation, the flow will be like this with a fully flooded irp device queue.

StartPacket->StartIo->StartNextPacket->StartIo->…

Won’t this result in kernel stack overflow? Some1 pls clear me his doubt :slight_smile:

Thanks,
Giri.
—
You are currently subscribed to ntdev as: xxxxx@storagecraft.com
To unsubscribe send a blank email to %%email.unsub%%

4

Eliyas’s advice about using IoSetStartIoAttributes is spot on if your
driver only runs on XP on later systems. For earlier systems, I suggest
that you schedule a DPC to call the StartNextPacket routine from
StartIo. This point is clarified in the 2d edition of my WDM book on p.
262 (if they don’t change the page numbering).

[January, to answer the obvious question.]

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