| Message ID | 20230106054856.37403-1-perry.yuan@amd.com |
|---|---|
| State | Superseded |
| Headers | show |
| Series | cpufreq: amd-pstate: fix kernel hang issue while amd-pstate unregistering | expand |
On 1/6/2023 11:18 AM, Perry Yuan wrote: > 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. > > Acked-by: Huang Rui <ray.huang@amd.com> > Reviewed-by: Mario Limonciello <mario.limonciello@amd.com> > Signed-off-by: Perry Yuan <perry.yuan@amd.com> Tested-by: Wyes Karny <wyes.karny@amd.com> > Cc: stable@vger.kernel.org > --- > drivers/cpufreq/amd-pstate.c | 1 + > 1 file changed, 1 insertion(+) > > diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c > index 204e39006dda..c17bd845f5fc 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)
diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c index 204e39006dda..c17bd845f5fc 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)