Messages in this thread | | | Date | Mon, 19 Dec 2022 16:55:19 -0600 | Subject | Re: [PATCH v8 04/13] cpufreq: amd-pstate: fix kernel hang issue while amd-pstate unregistering | From | "Limonciello, Mario" <> |
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On 12/19/2022 00:40, 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. > > Signed-off-by: Perry Yuan <perry.yuan@amd.com> > Acked-by: Huang Rui <ray.huang@amd.com>
Even if this patch comes into mainline through the series, this particular patch should go to stable too to fix users unloading amd-pstate with the existing passive mode.
Cc: stable@vger.kernel.org Reviewed-by: Mario Limonciello <mario.limonciello@amd.com>
> --- > 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)
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