apple-gmux: Assign apple_gmux_data before registering

Registering the handler after both GPUs will trigger a DDC switch for
connector reprobing. This will oops if apple_gmux_data hasn't already
been assigned. Reorder the code to do that.

[Lukas: More generally, this commit fixes a race condition that
is triggered by invoking a handler callback between the call to
vga_switcheroo_register_handler() and the assignment of
apple_gmux_data.]

Tested-by: Pierre Moreau <[email protected]>
    [MBP  5,3 2009  nvidia MCP79 + G96        pre-retina  15"]
Tested-by: Paul Hordiienko <[email protected]>
    [MBP  6,2 2010  intel ILK + nvidia GT216  pre-retina  15"]
Tested-by: Lukas Wunner <[email protected]>
    [MBP  9,1 2012  intel IVB + nvidia GK107  pre-retina  15"]
Tested-by: William Brown <[email protected]>
    [MBP  8,2 2011  intel SNB + amd turks     pre-retina  15"]
Tested-by: Bruno Bierbaumer <[email protected]>
    [MBP 11,3 2013  intel HSW + nvidia GK107  retina      15"]

Signed-off-by: Matthew Garrett <[email protected]>
Reviewed-by: Lukas Wunner <[email protected]>
Signed-off-by: Lukas Wunner <[email protected]>
Signed-off-by: Darren Hart <[email protected]>

0 files changed, 0 insertions, 0 deletions