same driver installed as filter driver to more than one class

Discussion in 'Windows Vista Drivers' started by John, Jan 20, 2005.

  1. John

    John Guest


    I have a WDM filter driver (say busguard.sys). I installed this driver
    as upper filter driver to the following classes

    1. PCMCIA Adapters
    2. IDE ATA/ATAPI controllers

    Is there any problem in installing same driver as filter to more than
    one classes. How many times my driver will be loaded to memory.

    John, Jan 20, 2005
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  2. your driver image will be loaded once. your AddDevice routine will be
    loaded for every instance of a device in each of the classes. there is
    usually no problem doing this, but if there are different rules for each
    class, you must account for them in the driver in the same code base.

    Doron Holan [MS], Jan 20, 2005
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