Setup for a composite device

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Hi,
   I am working on a USB composite device that has a serial interface,
and a mass storage interface. I added the vendorID and productID to
the generic_device_ids[] in usb serial generic driver
(drivers/usb/serial/generic.c). I also added an entry into the
storage/unusual_devs.h but when I plug-in the device at run time, only
USB serial devices are detected and nonw of the storage devices get
detected. I have to manually do a echo on bind for the storage driver
to bind with this device. Is there a way to do this automatically at
hotplug? Does Linux USB subsystem probe the driver list for the device
until it finds a first match or does it go through all the drivers?
Does this system work differently on a composite device?

-- 
Regards,
Meher
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