According to the original patch message:
Some Broadcom set-top-box boards have PCI busses, but the GPU is
still probed through DT. We would dereference a null busid here
in that case.
Fixes a segfault on at least the RPi 4 w/ xserver 1.20.9, probably
others as well.
Signed-off-by: Joseph Kogut <joseph.kogut@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
