> I have a trivial question, is it possible to Open a Device Driver (A)
> within and other Device Driver (B) and Handle the driver-A similar to how
> an application uses the Driver.
It is certainly possible to call the same operations, yes, if done with
proper care. One example you could look at would be the Raw I/O driver,
.../drivers/char/raw.c, though that requires an understanding of the kiovec
structure as well.
jon
Jonathan Corbet
Executive editor, LWN.net
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