Dispatch routine completing IRP

According to msdn, a driver should be completing various IRPs in its
dispatch routine. If the major code is not not implemented, our dispatch
routine sets the status to STATUS_NOT_IMPLEMENTED and completes it, but the
driver verifier utility sends in IRPS with valid major codes and the invalid
minor code(0xFF) to test the control paths. Is the minor code(0xFF) the
only reserved one? what if we wanted to use our own custom minor codes(do we
have to stay away from 0xFF? Should we be checking all the valid minor codes
for every major code each time before changing any data in it?

 

First not all IRP's care about minor codes, second the minor codes are
reserved for Microsoft, don't try claiming one. The verifier does send down
FF for IRP_MJ_PNP, you should not be completing those but instead passing
them to the lower driver, just like any other minor code you don't
understand.

 

it also does this for WMI and power irps. the rules for all 3 types of
these irps is if you don't support it, you leave it unmodified and send it
down teh stack.

d