Greg KH wrote:
Magic :)
Certainly a magic which I do not understand at this moment.
And my answer to this question is this is where modules.usbmap is used
and also when I connect USB device to my machine, some policy agents
reads modules.usbmap file and extracts information and must be calling
usbcore function. Then in turn usbcore will load/probe appropriate
device driver and NOT usbcore itself goes through list and decides about
which driver to load.
No, it is userspace that does this determination, not the kernel itself.
A combination of udev and modprobe does the work.
If so, I strongly feel that below line from Documentation/hotplug.txt
should be removed/changed.
"When the USB subsystem knows about a driver's device ID table, it's
used when choosing drivers to probe()..."
The word "USB subsystem" creates confusion. It gives me a sense that
everything is happening BY usb subsytem FROM looking at driver's device
ID table and which is not true as discussed.
It all happens with the module aliases, the modules.usbmap is
depreciated and no one uses it anymore.
Ok.
You don't have to do anything except set up a MODULE_DEVICE_TABLE and
then everything will "just work".
Is this not happening for you?
This is happening for me but I need understanding as well. There are
lots of things that happen on my *other* operating systems as well but I
do not know *how*. And that is why/how I love linux and try to
understand whatever that I come across.
Again as usual nice responses. Thanks. :)
thanks,
greg k-h
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