tree 076aa32842a8b54275d9cb226f8146c970b178ee
parent c026d970102e9af9958edefb4a015702c6aab636
author Taehee Yoo <ap420073@gmail.com> 1582806319 +0000
committer David S. Miller <davem@davemloft.net> 1582832707 -0800

net: rmnet: do not allow to change mux id if mux id is duplicated

Basically, duplicate mux id isn't be allowed.
So, the creation of rmnet will be failed if there is duplicate mux id
is existing.
But, changelink routine doesn't check duplicate mux id.

Test commands:
    modprobe rmnet
    ip link add dummy0 type dummy
    ip link add rmnet0 link dummy0 type rmnet mux_id 1
    ip link add rmnet1 link dummy0 type rmnet mux_id 2
    ip link set rmnet1 type rmnet mux_id 1

Fixes: 23790ef12082 ("net: qualcomm: rmnet: Allow to configure flags for existing devices")
Signed-off-by: Taehee Yoo <ap420073@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>