Files
linux-cryptodev-2.6/drivers/gpu/drm/amd/amdgpu
limingyu 6f81b2d047 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>
2020-04-23 15:06:41 -04:00
..
2019-09-16 09:59:21 -05:00
2019-06-20 11:36:22 -05:00
2020-04-09 10:43:33 -04:00
2019-06-10 23:00:01 +02:00
2019-06-20 21:16:38 -05:00
2020-03-16 16:17:55 -04:00