tree c53a809ec4ae345f10a52f7857f75e0cb45d99d7
parent ec719c52af164f2eaff0e5bff3b6074ded70c9bf
author Shuah Khan <shuahkh@osg.samsung.com> 1516216050 -0700
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1517673942 +0100

usbip: prevent bind loops on devices attached to vhci_hcd

commit ef54cf0c600fb8f5737fb001a9e357edda1a1de8 upstream.

usbip host binds to devices attached to vhci_hcd on the same server
when user does attach over localhost or specifies the server as the
remote.

usbip attach -r localhost -b busid
or
usbip attach -r servername (or server IP)

Unbind followed by bind works, however device is left in a bad state with
accesses via the attached busid result in errors and system hangs during
shutdown.

Fix it to check and bail out if the device is already attached to vhci_hcd.

Signed-off-by: Shuah Khan <shuahkh@osg.samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>