SpinLockDpc rule (wdm)

The SpinLockDpc rule specifies that calls to KeAcquireSpinLock or KeAcquireSpinLockRaiseToDpc and KeReleaseSpinLock must be made in strict alternation. That is, after calling KeAcquireSpinLock or KeAcquireSpinLockRaiseToDpc, the driver must call KeReleaseSpinLock before subsequent calls to KeAcquireSpinLock or to KeAcquireSpinLockRaiseToDpc.

Moreover, at the end of the dispatch or cancel routine, the driver should not hold the spinlock.

Driver model: WDM

How to test

At compile time
Run Static Driver Verifier and specify the SpinLockDpc rule. Use the following steps to run an analysis of your code: Prepare your code (use role type declarations). Run Static Driver Verifier. View and analyze the results. For more information, see Using Static Driver Verifier to Find Defects in Drivers.

Applies to

KeAcquireSpinLock KeAcquireSpinLockRaiseToDpc KeReleaseSpinLock