Rémi Bernon : winebus.sys: Only keep a single read pending.
Alexandre Julliard
julliard at winehq.org
Fri Oct 8 14:12:26 CDT 2021
Module: wine
Branch: master
Commit: bd780ba618f92825752aab65b8048666f6ce946e
URL: https://source.winehq.org/git/wine.git/?a=commit;h=bd780ba618f92825752aab65b8048666f6ce946e
Author: Rémi Bernon <rbernon at codeweavers.com>
Date: Fri Oct 8 10:01:22 2021 +0200
winebus.sys: Only keep a single read pending.
The design of hidclass.sys prevents any concurrent irps, there's no
need to queue more.
Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=51824
Signed-off-by: Rémi Bernon <rbernon at codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard at winehq.org>
---
dlls/winebus.sys/main.c | 49 ++++++++++++++++++++++++++++++-------------------
1 file changed, 30 insertions(+), 19 deletions(-)
diff --git a/dlls/winebus.sys/main.c b/dlls/winebus.sys/main.c
index c9e930632e2..33b2a609077 100644
--- a/dlls/winebus.sys/main.c
+++ b/dlls/winebus.sys/main.c
@@ -19,6 +19,7 @@
*/
#include <stdarg.h>
+#include <assert.h>
#include "ntstatus.h"
#define WIN32_NO_STATUS
@@ -74,7 +75,7 @@ struct device_extension
DWORD last_report_size;
BOOL last_report_read;
DWORD buffer_size;
- LIST_ENTRY irp_queue;
+ IRP *pending_read;
struct unix_device *unix_device;
};
@@ -249,17 +250,28 @@ static WCHAR *get_compatible_ids(DEVICE_OBJECT *device)
return dst;
}
+static IRP *pop_pending_read(struct device_extension *ext)
+{
+ IRP *pending;
+
+ RtlEnterCriticalSection(&ext->cs);
+ pending = ext->pending_read;
+ ext->pending_read = NULL;
+ RtlLeaveCriticalSection(&ext->cs);
+
+ return pending;
+}
+
static void remove_pending_irps(DEVICE_OBJECT *device)
{
struct device_extension *ext = device->DeviceExtension;
- LIST_ENTRY *entry;
+ IRP *pending;
- while ((entry = RemoveHeadList(&ext->irp_queue)) != &ext->irp_queue)
+ if ((pending = pop_pending_read(ext)))
{
- IRP *queued_irp = CONTAINING_RECORD(entry, IRP, Tail.Overlay.ListEntry);
- queued_irp->IoStatus.Status = STATUS_DELETE_PENDING;
- queued_irp->IoStatus.Information = 0;
- IoCompleteRequest(queued_irp, IO_NO_INCREMENT);
+ pending->IoStatus.Status = STATUS_DELETE_PENDING;
+ pending->IoStatus.Information = 0;
+ IoCompleteRequest(pending, IO_NO_INCREMENT);
}
}
@@ -295,7 +307,6 @@ static DEVICE_OBJECT *bus_create_hid_device(struct device_desc *desc, struct uni
ext->buffer_size = 0;
ext->unix_device = unix_device;
- InitializeListHead(&ext->irp_queue);
InitializeCriticalSection(&ext->cs);
ext->cs.DebugInfo->Spare[0] = (DWORD_PTR)(__FILE__ ": cs");
@@ -398,9 +409,10 @@ static NTSTATUS deliver_last_report(struct device_extension *ext, DWORD buffer_l
static void process_hid_report(DEVICE_OBJECT *device, BYTE *report, DWORD length)
{
- struct device_extension *ext = (struct device_extension*)device->DeviceExtension;
+ struct device_extension *ext = (struct device_extension *)device->DeviceExtension;
+ IO_STACK_LOCATION *stack;
+ ULONG buffer_len;
IRP *irp;
- LIST_ENTRY *entry;
if (!length || !report)
return;
@@ -427,15 +439,11 @@ static void process_hid_report(DEVICE_OBJECT *device, BYTE *report, DWORD length
ext->last_report_size = length;
ext->last_report_read = FALSE;
- while ((entry = RemoveHeadList(&ext->irp_queue)) != &ext->irp_queue)
+ if ((irp = pop_pending_read(ext)))
{
- IO_STACK_LOCATION *irpsp;
- TRACE_(hid_report)("Processing Request\n");
- irp = CONTAINING_RECORD(entry, IRP, Tail.Overlay.ListEntry);
- irpsp = IoGetCurrentIrpStackLocation(irp);
- irp->IoStatus.Status = deliver_last_report(ext,
- irpsp->Parameters.DeviceIoControl.OutputBufferLength,
- irp->UserBuffer, &irp->IoStatus.Information);
+ stack = IoGetCurrentIrpStackLocation(irp);
+ buffer_len = stack->Parameters.DeviceIoControl.OutputBufferLength;
+ irp->IoStatus.Status = deliver_last_report(ext, buffer_len, irp->UserBuffer, &irp->IoStatus.Information);
ext->last_report_read = TRUE;
IoCompleteRequest(irp, IO_NO_INCREMENT);
}
@@ -1015,7 +1023,10 @@ static NTSTATUS WINAPI hid_internal_dispatch(DEVICE_OBJECT *device, IRP *irp)
}
else
{
- InsertTailList(&ext->irp_queue, &irp->Tail.Overlay.ListEntry);
+ /* hidclass.sys should guarantee this */
+ assert(!ext->pending_read);
+ ext->pending_read = irp;
+ IoMarkIrpPending(irp);
irp->IoStatus.Status = STATUS_PENDING;
}
break;
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