PNP driver get device name

NTDEV
1

Hi,

I have a PNP driver and for some class devices I want to know the device name. I call the
routine IoGetDeviceProperty in DeviceAdd with DevicePropertyDeviceDescription property
. This is working fine except when device is added for the first time. I also call the function in dispatchPnp routine after IRP_MN_START_DEVICE but the same scenario. After some call of IRP_MN_QUERY_DEVICE_RELATIONS irps I can get the right name of the device.
My question is when I can know for sure that the current device is finish his initialization?

Thank you.

2

Start device.

Mark Roddy

On Wed, Sep 3, 2014 at 6:36 AM, wrote:

> Hi,
>
> I have a PNP driver and for some class devices I want to know the device
> name. I call the
> routine IoGetDeviceProperty in DeviceAdd with
> DevicePropertyDeviceDescription property
> . This is working fine except when device is added for the first time. I
> also call the function in dispatchPnp routine after IRP_MN_START_DEVICE
> but the same scenario. After some call of IRP_MN_QUERY_DEVICE_RELATIONS
> irps I can get the right name of the device.
> My question is when I can know for sure that the current device is finish
> his initialization?
>
> Thank you.
>
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3

PnP concept is to abandon the device names and use GUID-based device interfaces instead.

For most stacks, the bottom-most PDO is named like \Device\000000ca (FILE_AUTOGENERATED_DEVICE_NAME), and the rest of the attached devices are not named at all.

Device interface is a symlink pointing at \Device\000000ca

–
Maxim S. Shatskih
Microsoft MVP on File System And Storage
xxxxx@storagecraft.com
http://www.storagecraft.com

wrote in message news:xxxxx@ntdev…
> Hi,
>
> I have a PNP driver and for some class devices I want to know the device name. I call the
> routine IoGetDeviceProperty in DeviceAdd with DevicePropertyDeviceDescription property
> . This is working fine except when device is added for the first time. I also call the function in dispatchPnp routine after IRP_MN_START_DEVICE but the same scenario. After some call of IRP_MN_QUERY_DEVICE_RELATIONS irps I can get the right name of the device.
> My question is when I can know for sure that the current device is finish his initialization?
>
> Thank you.
>