Hesham/wintun
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Reduce IRP reference counter to 32-bit

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This unifies 32 and 64-bit platforms to both use only one PVOID in IRP
extension now.

Signed-off-by: Simon Rozman <simon@rozman.si>
This commit is contained in:
Simon Rozman 2019-06-05 07:49:15 +02:00 committed by Jason A. Donenfeld
parent 14617f118f
commit fd6300dc6f
1 changed files with 4 additions and 3 deletions
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7
wintun.c
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@ -585,7 +585,7 @@ static void TunQueueProcess(_Inout_ TUN_CTX *ctx)
}
}
#define IRP_REFCOUNT(irp) ((volatile LONG64 *)&(irp)->Tail.Overlay.DriverContext[0])
#define IRP_REFCOUNT(irp) ((volatile LONG *)&(irp)->Tail.Overlay.DriverContext[0])
#define NET_BUFFER_LIST_IRP(nbl) (NET_BUFFER_LIST_MINIPORT_RESERVED(nbl)[0])
_IRQL_requires_max_(DISPATCH_LEVEL)
@ -668,7 +668,7 @@ static NTSTATUS TunWriteFromIrp(_Inout_ TUN_CTX *ctx, _Inout_ IRP *Irp)
goto cleanup_TunCompletePause;
}
InterlockedExchange64(IRP_REFCOUNT(Irp), nbl_count);
InterlockedExchange(IRP_REFCOUNT(Irp), nbl_count);
IoMarkIrpPending(Irp);
NdisMIndicateReceiveNetBufferLists(ctx->MiniportAdapterHandle, nbl_head, NDIS_DEFAULT_PORT_NUMBER, nbl_count, 0);
@ -869,7 +869,8 @@ static void TunReturnNetBufferLists(NDIS_HANDLE MiniportAdapterContext, PNET_BUF
NdisFreeMdl(mdl);
NdisFreeNetBufferList(nbl);
if (InterlockedDecrement64(IRP_REFCOUNT(irp)) <= 0) {
ASSERT(InterlockedGet(IRP_REFCOUNT(irp)));
if (!InterlockedDecrement(IRP_REFCOUNT(irp))) {
TunCompleteRequest(ctx, irp, STATUS_SUCCESS, IO_NETWORK_INCREMENT);
TunCompletePause(ctx, TRUE);
}