[pso] [tema2]win - deinregistrare intrerupere - IoDisconnectInterrupt

[omar Chouydary]

Sa zicem ca atunci cand incarcam driver-ul avem o eroare pe parcurs si trebuie sa deinregistram o intrerupere (adica sa apelam   IoDisconnectInterrupt  ) . Conform celor din Windows 2000 Device Driver trebuie asa:
"Disconnecting from an interrupt is a two-step procedure. First, use  KeSyncrhonizeExecution and a SynchCritSection routine to disable the  device and prevent it from generating any further interrupts. Second, remove the  ISR from the kernel's list of handlers by passing the device's interrupt object  to IoDisconnectInterrupt. "
Deci ar trebui sa apelez IoDisconnectInterrupt in acea SynchCritSection routine (dupa cele spuse mai sus). Problema este ca daca ne uitam in DDK la acest IoDisconnectInterrupt vedem asta:
"Callers of IoDisconnectInterrupt must be running at IRQL =  PASSIVE_LEVEL"

Din moment ce la aplul KeSynchronizeExecution se schimba nivelul (a se vedea:
" When this routine is called, the following occurs: 
   The IRQL is raised to the SynchronizeIrql specified in the call to IoConnectInterrupt.   
   Access to SynchronizeContext is synchronized with the corresponding  ISR by acquiring the associated interrupt object spin lock.  
   The specified SynchCritSection  routine is called with the SynchronizeContext value as its parameter.  
  The SynchCritSection routine runs at DIRQL, so it must execute very  quickly." )
se pare ca avem un mare conflict de interese. So in windows 2000 driver model e scris aiurea ce trebuie facut? Adica pur si simplu apelez IoDisconnectInterrupt fara KeSynchronizeExecution?

Sry de mesajul acesta asa lung dar mi s-a parut foarte dubioasa treaba.

       
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