diff options
| author |   Qianheng Peng <pengqh1@chinatelecom.cn> | 2026-07-16 16:51:39 +0800 |
|---|---|---|
| committer |   Mario Limonciello <superm1@kernel.org> | 2026-07-22 13:45:48 -0500 |
| commit | 8d31bb1451643f328db0cea0e21e63ef54b4faf2 (patch) | |
| tree | 41b99fb46dbee6b52769e71a0db7d914e07510c7 | |
| parent | cpufreq/amd-pstate: Prevent the driver from loading on unsupported hardware (diff) | |
cpufreq: amd-pstate-ut: Skip tests when amd-pstate driver is not active
The crash issue may occur when modprobe amd_pstate_ut on intel platform.
amd_pstate_ut: 1 amd_pstate_ut_acpi_cpc_valid success!
amd_pstate_ut: 2 amd_pstate_ut_check_enabled success!
BUG: kernel NULL pointer dereference, address: 0000000000000080
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 0 P4D 0
Oops: 0000 [#1] SMP NOPTI
CPU: 0 PID: 20300 Comm: modprobe
Kdump: loaded Tainted: G O 6.6.0-0010.rc1.ctl4.x86_64 #1
Hardware name: FiberHome R2200 V5/Xeon Boards, BIOS 3.1a 02/24/2020
RIP: 0010:amd_pstate_ut_check_perf+0x141/0x280 [amd_pstate_ut]
Call Trace:
<TASK>
amd_pstate_ut_init+0x1b/0xff0 [amd_pstate_ut]
? __pfx_amd_pstate_ut_init+0x10/0x10 [amd_pstate_ut]
do_one_initcall+0x42/0x2e0
? kmalloc_trace+0x26/0x90
do_init_module+0x60/0x240
__se_sys_init_module+0x185/0x1c0
do_syscall_64+0x62/0x190
entry_SYSCALL_64_after_hwframe+0x76/0x7e
</TASK>
Add state detection to amd pstate driver to prevent amd_pstate_ut driver
from testing on non-AMD platforms.
Fixes: 14eb1c96e3a3 ("cpufreq: amd-pstate: Add test module for amd-pstate driver")
Suggested-by: Li Xiong <xiongl24@chinatelecom.cn>
Suggested-by: Xibo Wang <wangxb12@chinatelecom.cn>
Signed-off-by: Qianheng Peng <pengqh1@chinatelecom.cn>
Reviewed-by: Zhongqiu Han <zhongqiu.han@oss.qualcomm.com>
Link: https://lore.kernel.org/r/1784191899-28957-1-git-send-email-pengqh1@chinatelecom.cn
(ML: adjust title)
Signed-off-by: Mario Limonciello <superm1@kernel.org>
| -rw-r--r-- | drivers/cpufreq/amd-pstate-ut.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/cpufreq/amd-pstate-ut.c b/drivers/cpufreq/amd-pstate-ut.c index 735b29f76438..2142838ad6cc 100644 --- a/drivers/cpufreq/amd-pstate-ut.c +++ b/drivers/cpufreq/amd-pstate-ut.c @@ -560,6 +560,11 @@ out: static int __init amd_pstate_ut_init(void) { u32 i = 0, arr_size = ARRAY_SIZE(amd_pstate_ut_cases); + enum amd_pstate_mode mode = amd_pstate_get_status(); + + /* don't test if no running amd-pstate driver */ + if (mode == AMD_PSTATE_UNDEFINED || mode == AMD_PSTATE_DISABLE) + return -EOPNOTSUPP; for (i = 0; i < arr_size; i++) { int ret; |