hot-plug issue in WDF bus driver

NTDEV
1

Dear all
I have a WDF bus driver. It will create two child PDO and child function driver will be loaded for child PDO.
My question is about hot-plug. When there is any request in child function driver or bus driver and then I call WdfPdoMarkMissing to child pdo. child function driver cannot receive query remove or remove callbacks.
Why cannot child function driver receive remove callback? There is a message device is in use,if I use WdfPdoRequestEject to replace WdfPdoMarkMissing at this situation.

I found child function driver can receive remove callbacks if there is no request in bus and child function driver.

thank you very much.

denny

2

Query remove only happens on graceful remove, not surprise removal. Any handles opened against the child stack?

d

sent from my phpne

-----Original Message-----
From: xxxxx@gmail.com
Sent: April 24, 2010 7:12 AM
To: Windows System Software Devs Interest List
Subject: [ntdev] hot-plug issue in WDF bus driver

Dear all
I have a WDF bus driver. It will create two child PDO and child function driver will be loaded for child PDO.
My question is about hot-plug. When there is any request in child function driver or bus driver and then I call WdfPdoMarkMissing to child pdo. child function driver cannot receive query remove or remove callbacks.
Why cannot child function driver receive remove callback? There is a message device is in use,if I use WdfPdoRequestEject to replace WdfPdoMarkMissing at this situation.

I found child function driver can receive remove callbacks if there is no request in bus and child function driver.

thank you very much.

denny

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