powerpc/vas: poll for return of window credits
Normally, the NX driver waits for the CRBs to be processed before closing the window. But it is better to ensure that the credits are returned before the window gets reassigned later. Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
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