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Fix a race condition in input packet processing.

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svn path=/trunk/; revision=17160
This commit is contained in:
Filip Navara
2005-08-07 11:47:50 +00:00
parent b6bbf4cd23
commit ebd400d82c
1 changed files with 8 additions and 6 deletions
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reactos/drivers/input/mouclass/mouclass.c
+8 -6
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@@ -6,9 +6,7 @@
** The class driver between win32k and the various mouse port drivers
** TODO: Change interface to win32k to a callback instead of ReadFile IO
Add support for multiple port devices
** FIXME: Support IRP cancellation properly.
*/
#include <ddk/ntddk.h>
@@ -26,7 +24,7 @@ BOOLEAN MouseClassCallBack(
PMOUSE_INPUT_DATA MouseDataEnd, PULONG ConsumedCount)
{
PDEVICE_EXTENSION ClassDeviceExtension = ClassDeviceObject->DeviceExtension;
PIRP Irp;
PIRP Irp = NULL;
KIRQL OldIrql;
PIO_STACK_LOCATION Stack;
ULONG InputCount = MouseDataEnd - MouseDataStart;
@@ -53,8 +51,6 @@ BOOLEAN MouseClassCallBack(
Irp->IoStatus.Information = sizeof(MOUSE_INPUT_DATA);
Stack->Parameters.Read.Length = sizeof(MOUSE_INPUT_DATA);
IoStartNextPacket(ClassDeviceObject, FALSE);
IoCompleteRequest(Irp, IO_MOUSE_INCREMENT);
ClassDeviceExtension->ReadIsPending = FALSE;
/* Skip the packet we just sent away */
@@ -97,6 +93,12 @@ BOOLEAN MouseClassCallBack(
DPRINT("MouseClassCallBack() entered, InputCount = %d - DOING NOTHING\n", InputCount);
}
if (Irp != NULL)
{
IoStartNextPacket(ClassDeviceObject, FALSE);
IoCompleteRequest(Irp, IO_MOUSE_INCREMENT);
}
DPRINT("Leaving MouseClassCallBack\n");
return TRUE;
}