Thanks. Looks like this was the probelm.
-----Original Message-----
From: Peter Wieland [mailto:xxxxx@windows.microsoft.com]
Sent: Tuesday, January 27, 2004 5:12 PM
To: Windows System Software Devs Interest List
Subject: RE: [ntdev] SRB->DataBuffer NULL in Stor Port Driver.
ok. the former is a very common mistake.
did you tell storport that you need virtual addresses for your buffers
(the scsiport equivalent is MapBuffers, I don’t know this exists in
storport though)? If you didn’t then you won’t get a SrbDataBuffer
pointer because the buffer isn’t necessarily mapped into system address
space.
setting MapBuffers is quite expensive. Don’t do it unless you actually
need to get at the data buffer.
-p
-----Original Message-----
From: xxxxx@lists.osr.com
[mailto:xxxxx@lists.osr.com] On Behalf Of Saxena, Ajitabh
Prakash
Sent: Tuesday, January 27, 2004 2:00 PM
To: Windows System Software Devs Interest List
Subject: RE: [ntdev] SRB->DataBuffer NULL in Stor Port Driver.
Now here my Srb->CDB[0] = 28 -> SCSIOP_READ.
My Srb->DataTransferLength = 0x200 -> 512 Bytes.
When i do a StorPortGetScatterGatherList i get a SG list with one
element and with a proper Address.
-Ajitabh
-----Original Message-----
From: Peter Wieland [mailto:xxxxx@windows.microsoft.com]
Sent: Tuesday, January 27, 2004 4:51 PM
To: Windows System Software Devs Interest List
Subject: RE: [ntdev] SRB->DataBuffer NULL in Stor Port Driver.
this isn’t uncommon if the request doesn’t transfer any data.
TEST_UNIT_READY, for example, doesn’t have a data phase.
in a scsiport miniport you need to test the direction flags
(SRB_FLAGS_DATA_IN & SRB_FLAGS_DATA_OUT) and the data transfer length
and only try to use the data buffer if there’s data to transfer. I
strongly suspect the same is true for storport.
-p
-----Original Message-----
From: xxxxx@lists.osr.com
[mailto:xxxxx@lists.osr.com] On Behalf Of Saxena, Ajitabh
Prakash
Sent: Tuesday, January 27, 2004 1:38 PM
To: Windows System Software Devs Interest List
Subject: [ntdev] SRB->DataBuffer NULL in Stor Port Driver.
Hi All,
I am working on StorPort driver and strangly i am getting
Srb->SrbDataBuffer = 0x00000000. Obviously i will see a crash in my
system.
Is there a reason why i am getting this kind of SRB??
What should i do with this SRB???
Any help is highly appriciated.
Thanks,
Ajitabh
Questions? First check the Kernel Driver FAQ at
http://www.osronline.com/article.cfm?id=256
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