If you are able to access that server here are the things to do:
first of all you need to kill all the processes accessing your mobile phone. To kill them, you need to know, what processes are running.
open a console and type:
Code:
# lsof | grep /dev/xy
-> if you need to find out the name of your device type:
now it should give you the processes accessing your phone
you can either kill them manually (in the graphical interface)
or just kill them all with a command - to do so, you have to know the directory, where your phone is mounted to:
Code:
# fuser -km /mount-point
after that, you can unmount it:
the device is now unmounted, but still connected to your server (via usb)
so you just mount it again
Code:
# mount -t (xxx) /dev/xy /mount-point
I hope this helped you and that I didn't get anything wrong about the situation
edit: just saw your post - so yes, there is...you just unmount it and mount it again
edit2: if your phone isn't dong anything, you can just unmount it right away...the fuser command might cause date loss, if you cancel out certain processes
edit3: nice server