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Commit 6f81b2d0 authored by limingyu's avatar limingyu Committed by Alex Deucher
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drm/amdgpu: Init data to avoid oops while reading pp_num_states.



For chip like CHIP_OLAND with si enabled(amdgpu.si_support=1),
the amdgpu will expose pp_num_states to the /sys directory.
In this moment, read the pp_num_states file will excute the
amdgpu_get_pp_num_states func. In our case, the data hasn't
been initialized, so the kernel will access some ilegal
address, trigger the segmentfault and system will reboot soon:

    uos@uos-PC:~$ cat /sys/devices/pci0000\:00/0000\:00\:00.0/0000\:01\:00
    .0/pp_num_states

    Message from syslogd@uos-PC at Apr 22 09:26:20 ...
     kernel:[   82.154129] Internal error: Oops: 96000004 [#1] SMP

This patch aims to fix this problem, avoid that reading file
triggers the kernel sementfault.

Signed-off-by: default avatarlimingyu <limingyu@uniontech.com>
Signed-off-by: default avatarzhoubinbin <zhoubinbin@uniontech.com>
Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
parent 00aba6da
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