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[idd] input: purge report reads asynchronously

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WDF forbids WdfIoQueuePurgeSynchronously from an I/O callback.
Keep HID deactivation pending while the report queue is purged
asynchronously, then complete it from the queue-state callback.

Reject activation during the transition. Complete any remaining
deactivation request during queue cleanup.
This commit is contained in:
Geoffrey McRae
2026-08-15 18:00:01 +10:00
parent 066d64393d
commit fd2357565a
1 changed files with 68 additions and 21 deletions
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57
idd/LGInput/CHIDDevice.cpp
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@@ -80,6 +80,7 @@ struct HIDDeviceContext
HIDStatistics statistics;
HIDQueuedReport reports[REPORT_QUEUE_LENGTH];
CInputPipeClient * inputPipe;
WDFREQUEST deactivateRequest;
};
WDF_DECLARE_CONTEXT_TYPE_WITH_NAME(HIDDeviceContext, HIDGetDeviceContext);
@@ -88,6 +89,7 @@ static CSRWLock s_deviceLock;
static HIDDeviceContext * s_device = nullptr;
EVT_WDF_IO_QUEUE_IO_DEVICE_CONTROL HIDEvtIoDeviceControl;
EVT_WDF_IO_QUEUE_STATE HIDEvtReportQueuePurged;
EVT_WDF_OBJECT_CONTEXT_CLEANUP HIDEvtReportQueueCleanup;
EVT_WDF_OBJECT_CONTEXT_CLEANUP HIDEvtDeviceCleanup;
EVT_WDF_DEVICE_SELF_MANAGED_IO_INIT HIDEvtSelfManagedIoInit;
@@ -338,7 +340,7 @@ static NTSTATUS ActivateDevice(_Inout_ HIDDeviceContext * context)
{
CSRWExclusiveLock lifecycleLock(context->lifecycleLock);
CSRWExclusiveLock lock(context->reportLock);
if (context->stopping)
if (context->stopping || context->deactivateRequest)
return STATUS_DEVICE_NOT_READY;
WdfIoQueueStart(context->reportQueue);
@@ -346,21 +348,36 @@ static NTSTATUS ActivateDevice(_Inout_ HIDDeviceContext * context)
return STATUS_SUCCESS;
}
static NTSTATUS DeactivateDevice(_Inout_ HIDDeviceContext * context)
static NTSTATUS DeactivateDevice(
_Inout_ HIDDeviceContext * context,
_In_ WDFREQUEST request,
_Out_ bool * complete)
{
{
CSRWExclusiveLock lifecycleLock(context->lifecycleLock);
{
CSRWExclusiveLock lock(context->reportLock);
if (context->stopping)
return STATUS_DEVICE_NOT_READY;
if (context->deactivateRequest)
return STATUS_DEVICE_BUSY;
context->active = false;
context->reportHead = 0;
context->reportCount = 0;
context->consumerUsage = UINT16_MAX;
}
WdfIoQueuePurgeSynchronously(context->reportQueue);
return STATUS_SUCCESS;
context->deactivateRequest = request;
}
// WDF forbids synchronously purging any queue from EvtIoDeviceControl.
// Keep the HID deactivation request pending until the asynchronous purge
// has canceled every outstanding read report.
*complete = false;
WdfIoQueuePurge(
context->reportQueue, HIDEvtReportQueuePurged, context);
return STATUS_PENDING;
}
static NTSTATUS CreateQueues(_In_ WDFDEVICE device)
@@ -737,7 +754,7 @@ VOID HIDEvtIoDeviceControl(
break;
case IOCTL_HID_DEACTIVATE_DEVICE:
status = DeactivateDevice(context);
status = DeactivateDevice(context, request, &complete);
break;
default:
@@ -749,21 +766,51 @@ VOID HIDEvtIoDeviceControl(
WdfRequestComplete(request, status);
}
VOID HIDEvtReportQueuePurged(
_In_ WDFQUEUE queue,
_In_ WDFCONTEXT callbackContext)
{
UNREFERENCED_PARAMETER(queue);
HIDDeviceContext * context =
static_cast<HIDDeviceContext *>(callbackContext);
WDFREQUEST request = nullptr;
{
CSRWExclusiveLock lifecycleLock(context->lifecycleLock);
request = context->deactivateRequest;
context->deactivateRequest = nullptr;
}
if (request)
WdfRequestComplete(request, STATUS_SUCCESS);
}
VOID HIDEvtReportQueueCleanup(_In_ WDFOBJECT object)
{
HIDDeviceContext * context =
HIDGetDeviceContext(WdfIoQueueGetDevice((WDFQUEUE)object));
{
CSRWExclusiveLock deviceLock(s_deviceLock);
if (s_device == context)
s_device = nullptr;
}
WDFREQUEST deactivateRequest = nullptr;
{
CSRWExclusiveLock lifecycleLock(context->lifecycleLock);
{
CSRWExclusiveLock reportLock(context->reportLock);
context->stopping = true;
context->reportHead = 0;
context->reportCount = 0;
}
deactivateRequest = context->deactivateRequest;
context->deactivateRequest = nullptr;
}
if (deactivateRequest)
WdfRequestComplete(deactivateRequest, STATUS_DEVICE_REMOVED);
}
VOID HIDEvtDeviceCleanup(_In_ WDFOBJECT object)