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sys: device.c: use ERESOURCE instead of fast/guarded mutex as a lock for Context table

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This commit is contained in:
Bill Zissimopoulos 2016-01-15 16:00:30 -08:00
parent 58b16cdaae
commit fd6c36b62c
2 changed files with 19 additions and 18 deletions
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35
src/sys/device.c
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@ -291,7 +291,7 @@ static NTSTATUS FspFsvolDeviceInit(PDEVICE_OBJECT DeviceObject)
FsvolDeviceExtension->InitDoneIoq = 1;
/* initialize our generic table */
KeInitializeGuardedMutex(&FsvolDeviceExtension->GenericTableMutex);
ExInitializeResourceLite(&FsvolDeviceExtension->GenericTableResource);
RtlInitializeGenericTableAvl(&FsvolDeviceExtension->GenericTable,
FspFsvolDeviceCompareElement, FspFsvolDeviceAllocateElement, FspFsvolDeviceFreeElement, 0);
FsvolDeviceExtension->InitDoneGenTab = 1;
@ -326,24 +326,25 @@ static VOID FspFsvolDeviceFini(PDEVICE_OBJECT DeviceObject)
if (FsvolDeviceExtension->InitDoneTimer)
IoStopTimer(DeviceObject);
#if 0
/* FspDeviceFreeElement is now a no-op, so this is no longer necessary */
/*
* Enumerate and delete all entries in the GenericTable.
* There is no need to protect accesses to the table as we are in the device destructor.
*/
if (FsvolDeviceExtension->InitDoneGenTab)
{
FSP_DEVICE_GENERIC_TABLE_ELEMENT_DATA *Element;
while (0 != (Element = RtlGetElementGenericTableAvl(&FsvolDeviceExtension->GenericTable, 0)))
RtlDeleteElementGenericTableAvl(&FsvolDeviceExtension->GenericTable, &Element->Identifier);
}
#endif
/* delete the Ioq */
if (FsvolDeviceExtension->InitDoneIoq)
FspIoqDelete(FsvolDeviceExtension->Ioq);
if (FsvolDeviceExtension->InitDoneGenTab)
{
#if 0
/* FspDeviceFreeElement is now a no-op, so this is no longer necessary */
/*
* Enumerate and delete all entries in the GenericTable.
* There is no need to protect accesses to the table as we are in the device destructor.
*/
FSP_DEVICE_GENERIC_TABLE_ELEMENT_DATA *Element;
while (0 != (Element = RtlGetElementGenericTableAvl(&FsvolDeviceExtension->GenericTable, 0)))
RtlDeleteElementGenericTableAvl(&FsvolDeviceExtension->GenericTable, &Element->Identifier);
#endif
ExDeleteResourceLite(&FsvolDeviceExtension->GenericTableResource);
}
/* finalize our delete lock */
if (FsvolDeviceExtension->InitDoneDelRsc)
ExDeleteResourceLite(&FsvolDeviceExtension->DeleteResource);
@ -413,7 +414,7 @@ VOID FspFsvolDeviceLockContextTable(PDEVICE_OBJECT DeviceObject)
PAGED_CODE();
FSP_FSVOL_DEVICE_EXTENSION *FsvolDeviceExtension = FspFsvolDeviceExtension(DeviceObject);
KeAcquireGuardedMutex(&FsvolDeviceExtension->GenericTableMutex);
ExAcquireResourceExclusiveLite(&FsvolDeviceExtension->GenericTableResource, TRUE);
}
VOID FspFsvolDeviceUnlockContextTable(PDEVICE_OBJECT DeviceObject)
@ -421,7 +422,7 @@ VOID FspFsvolDeviceUnlockContextTable(PDEVICE_OBJECT DeviceObject)
PAGED_CODE();
FSP_FSVOL_DEVICE_EXTENSION *FsvolDeviceExtension = FspFsvolDeviceExtension(DeviceObject);
KeReleaseGuardedMutex(&FsvolDeviceExtension->GenericTableMutex);
ExReleaseResourceLite(&FsvolDeviceExtension->GenericTableResource);
}
PVOID FspFsvolDeviceLookupContext(PDEVICE_OBJECT DeviceObject, UINT64 Identifier)

2
src/sys/driver.h
View File

@ -434,7 +434,7 @@ typedef struct
KSPIN_LOCK ExpirationLock;
WORK_QUEUE_ITEM ExpirationWorkItem;
BOOLEAN ExpirationInProgress;
KGUARDED_MUTEX GenericTableMutex;
ERESOURCE GenericTableResource;
RTL_AVL_TABLE GenericTable;
PVOID GenericTableElementStorage;
UNICODE_STRING VolumeName;