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author | 2023-01-10 23:10:29 +0800 | |
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committer | 2023-01-10 20:31:08 +0100 | |
commit | 4f3085f87b51a551a0647f218d4f324796ecb703 (patch) | |
tree | 1eaf2e8a6352ac91c657b3f17c2c99fcc87df218 /drivers/cpufreq | |
parent | Merge tag 'cpufreq/arm/fixes-6.2-rc4' of git://git.kernel.org/pub/scm/linux/k... (diff) | |
download | linux-4f3085f87b51a551a0647f218d4f324796ecb703.tar.gz linux-4f3085f87b51a551a0647f218d4f324796ecb703.tar.bz2 linux-4f3085f87b51a551a0647f218d4f324796ecb703.zip |
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>
Diffstat (limited to 'drivers/cpufreq')
-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 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) |