[janderwald] 54836: [USB-BRINGUP] - Create a pesudo random instance id - Fixes assert when plugin usb devices whose device descriptor don't provide a serial number

Author: janderwald
Date: Thu Jan  5 00:13:50 2012
New Revision: 54836

URL: http://svn.reactos.org/svn/reactos?rev=54836&view=rev
Log:
[USB-BRINGUP]
- Create a pesudo random instance id
- Fixes assert when plugin usb devices whose device descriptor don't provide a serial
number

Modified:
    branches/usb-bringup/drivers/usb/usbhub_new/fdo.c

Modified: branches/usb-bringup/drivers/usb/usbhub_new/fdo.c
URL:
http://svn.reactos.org/svn/reactos/branches/usb-bringup/drivers/usb/usbhub_…
==============================================================================
--- branches/usb-bringup/drivers/usb/usbhub_new/fdo.c [iso-8859-1] (original)
+++ branches/usb-bringup/drivers/usb/usbhub_new/fdo.c [iso-8859-1] Thu Jan  5 00:13:50
2012
@@ -954,6 +954,28 @@
         UsbChildExtension->usInstanceId.MaximumLength =
UsbChildExtension->usInstanceId.Length;
         DPRINT1("Usb InstanceId %wZ\n",
&UsbChildExtension->usInstanceId);
     }
+    else
+    {
+       //
+       // the device did not provide a serial number, lets create a pseudo instance id
+       //
+       Index = swprintf(BufferPtr,
L"USB\\Vid_%04x&Pid_%04x&1A0700BC\0",
UsbChildExtension->DeviceDesc.idVendor, UsbChildExtension->DeviceDesc.idProduct) +
1;
+       UsbChildExtension->usInstanceId.Buffer = (LPWSTR)ExAllocatePool(NonPagedPool,
Index * sizeof(WCHAR));
+       if (UsbChildExtension->usInstanceId.Buffer == NULL)
+       {
+           DPRINT1("Error: failed to allocate %lu bytes\n", Index *
sizeof(WCHAR));
+           goto Cleanup;
+       }
+
+       //
+       // copy instance id
+       //
+       RtlCopyMemory(UsbChildExtension->usInstanceId.Buffer, BufferPtr,
wcslen(BufferPtr) * sizeof(WCHAR));
+       UsbChildExtension->usInstanceId.Length =
UsbChildExtension->usDeviceId.MaximumLength = Index * sizeof(WCHAR);
+
+       DPRINT1("usDeviceId %wZ\n", &UsbChildExtension->usInstanceId);
+    }
+
 
     return Status;