lkml.org 
[lkml]   [2020]   [Jun]   [8]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH AUTOSEL 5.4 014/175] drm/amdgpu: Init data to avoid oops while reading pp_num_states.
Date
From: limingyu <limingyu@uniontech.com>

[ Upstream commit 6f81b2d047c59eb77cd04795a44245d6a52cdaec ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c
index 51263b8d94b1..c8008b956363 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c
@@ -416,8 +416,11 @@ static ssize_t amdgpu_get_pp_num_states(struct device *dev,
ret = smu_get_power_num_states(&adev->smu, &data);
if (ret)
return ret;
- } else if (adev->powerplay.pp_funcs->get_pp_num_states)
+ } else if (adev->powerplay.pp_funcs->get_pp_num_states) {
amdgpu_dpm_get_pp_num_states(adev, &data);
+ } else {
+ memset(&data, 0, sizeof(data));
+ }

buf_len = snprintf(buf, PAGE_SIZE, "states: %d\n", data.nums);
for (i = 0; i < data.nums; i++)
--
2.25.1
\
 
 \ /
  Last update: 2020-06-09 02:16    [W:0.392 / U:0.764 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site