[reactos] 04/05: [NTOSKRNL] De-duplicate code between Ob(f)DereferenceDeviceMap functions

[Pierre Schweitzer]

https://git.reactos.org/?p=reactos.git;a=commitdiff;h=221ed8814121e5fb5af5e…

commit 221ed8814121e5fb5af5e56a9197d34e9c091824
Author:     Pierre Schweitzer <pierre(a)reactos.org>
AuthorDate: Sat Jun 1 13:54:15 2019 +0200
Commit:     Pierre Schweitzer <pierre(a)reactos.org>
CommitDate: Sat Jun 1 13:54:34 2019 +0200

    [NTOSKRNL] De-duplicate code between Ob(f)DereferenceDeviceMap functions
---
 ntoskrnl/ob/devicemap.c | 29 ++---------------------------
 1 file changed, 2 insertions(+), 27 deletions(-)

diff --git a/ntoskrnl/ob/devicemap.c b/ntoskrnl/ob/devicemap.c
index c79838bbabd..8cda474a38d 100644
--- a/ntoskrnl/ob/devicemap.c
+++ b/ntoskrnl/ob/devicemap.c
@@ -156,33 +156,8 @@ ObDereferenceDeviceMap(IN PEPROCESS Process)
     KeReleaseGuardedMutex(&ObpDeviceMapLock);
 
     /* Continue only if there is a device map */
-    if (DeviceMap == NULL)
-        return;
-
-    /* Acquire the device map lock again */
-    KeAcquireGuardedMutex(&ObpDeviceMapLock);
-
-    /* Decrement the reference counter */
-    DeviceMap->ReferenceCount--;
-    DPRINT("ReferenceCount: %lu\n", DeviceMap->ReferenceCount);
-
-    /* Leave, if there are still references to this device map */
-    if (DeviceMap->ReferenceCount != 0)
-    {
-        /* Release the device map lock and leave */
-        KeReleaseGuardedMutex(&ObpDeviceMapLock);
-        return;
-    }
-
-    /* Nobody is referencing it anymore, unlink the DOS directory */
-    DeviceMap->DosDevicesDirectory->DeviceMap = NULL;
-
-    /* Release the device map lock */
-    KeReleaseGuardedMutex(&ObpDeviceMapLock);
-
-    /* Dereference the DOS Devices Directory and free the DeviceMap */
-    ObDereferenceObject(DeviceMap->DosDevicesDirectory);
-    ExFreePoolWithTag(DeviceMap, 'mDbO');
+    if (DeviceMap != NULL)
+        ObfDereferenceDeviceMap(DeviceMap);
 }