On Tue, Nov 30, 2021 at 12:12:29AM +0200, Marian Postevca wrote: > When listening for notifications through netlink of a new interface being > registered, sporadically, it is possible for the MAC to be read as zero. > The zero MAC address lasts a short period of time and then switches to a > valid random MAC address. > > This causes problems for netd in Android, which assumes that the interface > is malfunctioning and will not use it. > > In the good case we get this log: > InterfaceController::getCfg() ifName usb0 > hwAddr 92:a8:f0:73:79:5b ipv4Addr 0.0.0.0 flags 0x1002 > > In the error case we get these logs: > InterfaceController::getCfg() ifName usb0 > hwAddr 00:00:00:00:00:00 ipv4Addr 0.0.0.0 flags 0x1002 > > netd : interfaceGetCfg("usb0") > netd : interfaceSetCfg() -> ServiceSpecificException > (99, "[Cannot assign requested address] : ioctl() failed") > > The reason for the issue is the order in which the interface is setup, > it is first registered through register_netdev() and after the MAC > address is set. > > Fixed by first setting the MAC address of the net_device and after that > calling register_netdev(). > > Signed-off-by: Marian Postevca <posteuca@xxxxxxxxx> > --- > drivers/usb/gadget/function/u_ether.c | 16 ++++++---------- > 1 file changed, 6 insertions(+), 10 deletions(-) What commit does this fix? Should it go to stable kernel releases? thanks, greg k-h