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| author | Perry Yuan <perry.yuan@amd.com> | 2023-01-10 23:10:29 +0800 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2023-01-10 20:31:08 +0100 |
| commit | 4f3085f87b51a551a0647f218d4f324796ecb703 (patch) | |
| tree | 1eaf2e8a6352ac91c657b3f17c2c99fcc87df218 | |
| parent | 7e834ff13c4fcdf2bbd0eaf740781445d9c45d2e (diff) | |
| download | linux-4f3085f87b51a551a0647f218d4f324796ecb703.tar.gz | |
cpufreq: amd-pstate: fix kernel hang issue while amd-pstate unregistering
In the amd_pstate_adjust_perf(), there is one cpufreq_cpu_get() call to
increase increments the kobject reference count of policy and make it as
busy. Therefore, a corresponding call to cpufreq_cpu_put() is needed to
decrement the kobject reference count back, it will resolve the kernel
hang issue when unregistering the amd-pstate driver and register the
`amd_pstate_epp` driver instance.
Fixes: 1d215f0319 ("cpufreq: amd-pstate: Add fast switch function for AMD P-State")
Acked-by: Huang Rui <ray.huang@amd.com>
Reviewed-by: Mario Limonciello <mario.limonciello@amd.com>
Tested-by: Wyes Karny <wyes.karny@amd.com>
Signed-off-by: Perry Yuan <perry.yuan@amd.com>
Cc: 5.17+ <stable@vger.kernel.org> # 5.17+
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
| -rw-r--r-- | drivers/cpufreq/amd-pstate.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c index 204e39006dda8f..c17bd845f5fcb8 100644 --- a/drivers/cpufreq/amd-pstate.c +++ b/drivers/cpufreq/amd-pstate.c @@ -307,6 +307,7 @@ static void amd_pstate_adjust_perf(unsigned int cpu, max_perf = min_perf; amd_pstate_update(cpudata, min_perf, des_perf, max_perf, true); + cpufreq_cpu_put(policy); } static int amd_get_min_freq(struct amd_cpudata *cpudata) |