diff options
| author | limingyu <limingyu@uniontech.com> | 2020-04-22 12:01:19 +0300 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2020-04-23 22:06:41 +0300 |
| commit | 6f81b2d047c59eb77cd04795a44245d6a52cdaec (patch) | |
| tree | 68895ea3bb7878b6cab2c30cc3ddc34bfd2cbf4b /Documentation/power | |
| parent | 00aba6da21e5886e4d279bc3679cd2b4548d10f1 (diff) | |
| download | linux-6f81b2d047c59eb77cd04795a44245d6a52cdaec.tar.xz | |
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: limingyu <limingyu@uniontech.com>
Signed-off-by: zhoubinbin <zhoubinbin@uniontech.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Diffstat (limited to 'Documentation/power')
0 files changed, 0 insertions, 0 deletions