NULL pointer at pcie_capability_read_dword with Radeon SI vfio passthrough

Submitted by Ryan Bair

Assigned to Default DRI bug account

Link to original bug (#109366)

Description

Created attachment 143131
dmesg output

My guest is seeing the attached bug and call trace during boot. Kernel 4.20.2-200, also an issue on 4.19 series. 4.18 is similar with the older drm_ prefixed version of the function.

Attachment 143131, "dmesg output":
radeon_oops.txt