E100bex Sample

NTDEV
1

Hi,
while i was looking at the e100bex miniport driver samples i noticed
that MP_FREE_SEND_PACKET releases the SendLock using
NdisReleaseSpinLock. However MP_FREE_SEND_PACKET is invoked within
MpHandleSendInterrupt, which is called with the SendLock acquired (using
the Dpr version of the Acquire spinlock function).

Can a spinlock acquired using NdisDprAcquireSpinlock be released using
NdisReleaseSpinlock (instead of NdisDprReleaseSpinlock). What’ s the
impact of such uses. Is it legal, or is this a bug?

Best Regards
Yagmur Konuslu

2

It is a bug if your observation is accurate.

NdisDprAcquireSpinLock is equivalent to KeAcquireSpinLockAtDpcLevel. The
lock must be released by NdisDprReleaseSpinLock (equivalent to
KeReleaseSpinLockFromDpcLevel).

Calvin Guan Software Engineer
ATI Technologies Inc. www.ati.com

-----Original Message-----
From: xxxxx@lists.osr.com [mailto:bounce-205044-
xxxxx@lists.osr.com] On Behalf Of Yagmur Konuslu
Sent: March 29, 2005 5:30 PM
To: Windows System Software Devs Interest List
Subject: [ntdev] E100bex Sample

Hi,
while i was looking at the e100bex miniport driver samples i noticed
that MP_FREE_SEND_PACKET releases the SendLock using
NdisReleaseSpinLock. However MP_FREE_SEND_PACKET is invoked within
MpHandleSendInterrupt, which is called with the SendLock acquired (using
the Dpr version of the Acquire spinlock function).

Can a spinlock acquired using NdisDprAcquireSpinlock be released using
NdisReleaseSpinlock (instead of NdisDprReleaseSpinlock). What’ s the
impact of such uses. Is it legal, or is this a bug?

Best Regards
Yagmur Konuslu

Questions? First check the Kernel Driver FAQ at
http://www.osronline.com/article.cfm?id=256

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