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Date: Tue, 29 Aug 2017 15:52:57 -0400
From: Alex Deucher <alexdeucher@...il.com>
To: Harry Wentland <harry.wentland@....com>
Cc: Himanshu Jha <himanshujha199640@...il.com>,
Dave Airlie <airlied@...ux.ie>,
LKML <linux-kernel@...r.kernel.org>,
amd-gfx list <amd-gfx@...ts.freedesktop.org>,
Maling list - DRI developers
<dri-devel@...ts.freedesktop.org>,
"Deucher, Alexander" <alexander.deucher@....com>,
Rex Zhu <Rex.Zhu@....com>,
Christian Koenig <christian.koenig@....com>
Subject: Re: [PATCH] drm/amd/powerplay/hwmgr: Remove null check before kfree
On Tue, Aug 29, 2017 at 9:34 AM, Harry Wentland <harry.wentland@....com> wrote:
> On 2017-08-29 09:12 AM, Himanshu Jha wrote:
>> kfree on NULL pointer is a no-op and therefore checking is redundant.
>>
>> Signed-off-by: Himanshu Jha <himanshujha199640@...il.com>
>
> Reviewed-by: Harry Wentland <harry.wentland@....com>
Applied. thanks!
Alex
>
> Harry
>
>> ---
>> drivers/gpu/drm/amd/powerplay/hwmgr/cz_hwmgr.c | 6 +-
>> .../gpu/drm/amd/powerplay/hwmgr/processpptables.c | 96 ++++++++--------------
>> drivers/gpu/drm/amd/powerplay/hwmgr/rv_hwmgr.c | 52 ++++--------
>> drivers/gpu/drm/amd/powerplay/hwmgr/smu7_hwmgr.c | 12 +--
>> 4 files changed, 56 insertions(+), 110 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/amd/powerplay/hwmgr/cz_hwmgr.c b/drivers/gpu/drm/amd/powerplay/hwmgr/cz_hwmgr.c
>> index bc839ff..9f2c037 100644
>> --- a/drivers/gpu/drm/amd/powerplay/hwmgr/cz_hwmgr.c
>> +++ b/drivers/gpu/drm/amd/powerplay/hwmgr/cz_hwmgr.c
>> @@ -1225,10 +1225,8 @@ static int cz_hwmgr_backend_fini(struct pp_hwmgr *hwmgr)
>> phm_destroy_table(hwmgr, &(hwmgr->power_down_asic));
>> phm_destroy_table(hwmgr, &(hwmgr->setup_asic));
>>
>> - if (NULL != hwmgr->dyn_state.vddc_dep_on_dal_pwrl) {
>> - kfree(hwmgr->dyn_state.vddc_dep_on_dal_pwrl);
>> - hwmgr->dyn_state.vddc_dep_on_dal_pwrl = NULL;
>> - }
>> + kfree(hwmgr->dyn_state.vddc_dep_on_dal_pwrl);
>> + hwmgr->dyn_state.vddc_dep_on_dal_pwrl = NULL;
>>
>> kfree(hwmgr->backend);
>> hwmgr->backend = NULL;
>> diff --git a/drivers/gpu/drm/amd/powerplay/hwmgr/processpptables.c b/drivers/gpu/drm/amd/powerplay/hwmgr/processpptables.c
>> index 2716721..a6dbc55 100644
>> --- a/drivers/gpu/drm/amd/powerplay/hwmgr/processpptables.c
>> +++ b/drivers/gpu/drm/amd/powerplay/hwmgr/processpptables.c
>> @@ -1615,85 +1615,53 @@ static int pp_tables_uninitialize(struct pp_hwmgr *hwmgr)
>> if (hwmgr->chip_id == CHIP_RAVEN)
>> return 0;
>>
>> - if (NULL != hwmgr->dyn_state.vddc_dependency_on_sclk) {
>> - kfree(hwmgr->dyn_state.vddc_dependency_on_sclk);
>> - hwmgr->dyn_state.vddc_dependency_on_sclk = NULL;
>> - }
>> + kfree(hwmgr->dyn_state.vddc_dependency_on_sclk);
>> + hwmgr->dyn_state.vddc_dependency_on_sclk = NULL;
>>
>> - if (NULL != hwmgr->dyn_state.vddci_dependency_on_mclk) {
>> - kfree(hwmgr->dyn_state.vddci_dependency_on_mclk);
>> - hwmgr->dyn_state.vddci_dependency_on_mclk = NULL;
>> - }
>> + kfree(hwmgr->dyn_state.vddci_dependency_on_mclk);
>> + hwmgr->dyn_state.vddci_dependency_on_mclk = NULL;
>>
>> - if (NULL != hwmgr->dyn_state.vddc_dependency_on_mclk) {
>> - kfree(hwmgr->dyn_state.vddc_dependency_on_mclk);
>> - hwmgr->dyn_state.vddc_dependency_on_mclk = NULL;
>> - }
>> + kfree(hwmgr->dyn_state.vddc_dependency_on_mclk);
>> + hwmgr->dyn_state.vddc_dependency_on_mclk = NULL;
>>
>> - if (NULL != hwmgr->dyn_state.mvdd_dependency_on_mclk) {
>> - kfree(hwmgr->dyn_state.mvdd_dependency_on_mclk);
>> - hwmgr->dyn_state.mvdd_dependency_on_mclk = NULL;
>> - }
>> + kfree(hwmgr->dyn_state.mvdd_dependency_on_mclk);
>> + hwmgr->dyn_state.mvdd_dependency_on_mclk = NULL;
>>
>> - if (NULL != hwmgr->dyn_state.valid_mclk_values) {
>> - kfree(hwmgr->dyn_state.valid_mclk_values);
>> - hwmgr->dyn_state.valid_mclk_values = NULL;
>> - }
>> + kfree(hwmgr->dyn_state.valid_mclk_values);
>> + hwmgr->dyn_state.valid_mclk_values = NULL;
>>
>> - if (NULL != hwmgr->dyn_state.valid_sclk_values) {
>> - kfree(hwmgr->dyn_state.valid_sclk_values);
>> - hwmgr->dyn_state.valid_sclk_values = NULL;
>> - }
>> + kfree(hwmgr->dyn_state.valid_sclk_values);
>> + hwmgr->dyn_state.valid_sclk_values = NULL;
>>
>> - if (NULL != hwmgr->dyn_state.cac_leakage_table) {
>> - kfree(hwmgr->dyn_state.cac_leakage_table);
>> - hwmgr->dyn_state.cac_leakage_table = NULL;
>> - }
>> + kfree(hwmgr->dyn_state.cac_leakage_table);
>> + hwmgr->dyn_state.cac_leakage_table = NULL;
>>
>> - if (NULL != hwmgr->dyn_state.vddc_phase_shed_limits_table) {
>> - kfree(hwmgr->dyn_state.vddc_phase_shed_limits_table);
>> - hwmgr->dyn_state.vddc_phase_shed_limits_table = NULL;
>> - }
>> + kfree(hwmgr->dyn_state.vddc_phase_shed_limits_table);
>> + hwmgr->dyn_state.vddc_phase_shed_limits_table = NULL;
>>
>> - if (NULL != hwmgr->dyn_state.vce_clock_voltage_dependency_table) {
>> - kfree(hwmgr->dyn_state.vce_clock_voltage_dependency_table);
>> - hwmgr->dyn_state.vce_clock_voltage_dependency_table = NULL;
>> - }
>> + kfree(hwmgr->dyn_state.vce_clock_voltage_dependency_table);
>> + hwmgr->dyn_state.vce_clock_voltage_dependency_table = NULL;
>>
>> - if (NULL != hwmgr->dyn_state.uvd_clock_voltage_dependency_table) {
>> - kfree(hwmgr->dyn_state.uvd_clock_voltage_dependency_table);
>> - hwmgr->dyn_state.uvd_clock_voltage_dependency_table = NULL;
>> - }
>> + kfree(hwmgr->dyn_state.uvd_clock_voltage_dependency_table);
>> + hwmgr->dyn_state.uvd_clock_voltage_dependency_table = NULL;
>>
>> - if (NULL != hwmgr->dyn_state.samu_clock_voltage_dependency_table) {
>> - kfree(hwmgr->dyn_state.samu_clock_voltage_dependency_table);
>> - hwmgr->dyn_state.samu_clock_voltage_dependency_table = NULL;
>> - }
>> + kfree(hwmgr->dyn_state.samu_clock_voltage_dependency_table);
>> + hwmgr->dyn_state.samu_clock_voltage_dependency_table = NULL;
>>
>> - if (NULL != hwmgr->dyn_state.acp_clock_voltage_dependency_table) {
>> - kfree(hwmgr->dyn_state.acp_clock_voltage_dependency_table);
>> - hwmgr->dyn_state.acp_clock_voltage_dependency_table = NULL;
>> - }
>> + kfree(hwmgr->dyn_state.acp_clock_voltage_dependency_table);
>> + hwmgr->dyn_state.acp_clock_voltage_dependency_table = NULL;
>>
>> - if (NULL != hwmgr->dyn_state.cac_dtp_table) {
>> - kfree(hwmgr->dyn_state.cac_dtp_table);
>> - hwmgr->dyn_state.cac_dtp_table = NULL;
>> - }
>> + kfree(hwmgr->dyn_state.cac_dtp_table);
>> + hwmgr->dyn_state.cac_dtp_table = NULL;
>>
>> - if (NULL != hwmgr->dyn_state.ppm_parameter_table) {
>> - kfree(hwmgr->dyn_state.ppm_parameter_table);
>> - hwmgr->dyn_state.ppm_parameter_table = NULL;
>> - }
>> + kfree(hwmgr->dyn_state.ppm_parameter_table);
>> + hwmgr->dyn_state.ppm_parameter_table = NULL;
>>
>> - if (NULL != hwmgr->dyn_state.vdd_gfx_dependency_on_sclk) {
>> - kfree(hwmgr->dyn_state.vdd_gfx_dependency_on_sclk);
>> - hwmgr->dyn_state.vdd_gfx_dependency_on_sclk = NULL;
>> - }
>> + kfree(hwmgr->dyn_state.vdd_gfx_dependency_on_sclk);
>> + hwmgr->dyn_state.vdd_gfx_dependency_on_sclk = NULL;
>>
>> - if (NULL != hwmgr->dyn_state.vq_budgeting_table) {
>> - kfree(hwmgr->dyn_state.vq_budgeting_table);
>> - hwmgr->dyn_state.vq_budgeting_table = NULL;
>> - }
>> + kfree(hwmgr->dyn_state.vq_budgeting_table);
>> + hwmgr->dyn_state.vq_budgeting_table = NULL;
>>
>> return 0;
>> }
>> diff --git a/drivers/gpu/drm/amd/powerplay/hwmgr/rv_hwmgr.c b/drivers/gpu/drm/amd/powerplay/hwmgr/rv_hwmgr.c
>> index 2c3e6ba..5547ed3 100644
>> --- a/drivers/gpu/drm/amd/powerplay/hwmgr/rv_hwmgr.c
>> +++ b/drivers/gpu/drm/amd/powerplay/hwmgr/rv_hwmgr.c
>> @@ -640,40 +640,24 @@ static int rv_hwmgr_backend_fini(struct pp_hwmgr *hwmgr)
>> phm_destroy_table(hwmgr, &(hwmgr->power_down_asic));
>> phm_destroy_table(hwmgr, &(hwmgr->setup_asic));
>>
>> - if (pinfo->vdd_dep_on_dcefclk) {
>> - kfree(pinfo->vdd_dep_on_dcefclk);
>> - pinfo->vdd_dep_on_dcefclk = NULL;
>> - }
>> - if (pinfo->vdd_dep_on_socclk) {
>> - kfree(pinfo->vdd_dep_on_socclk);
>> - pinfo->vdd_dep_on_socclk = NULL;
>> - }
>> - if (pinfo->vdd_dep_on_fclk) {
>> - kfree(pinfo->vdd_dep_on_fclk);
>> - pinfo->vdd_dep_on_fclk = NULL;
>> - }
>> - if (pinfo->vdd_dep_on_dispclk) {
>> - kfree(pinfo->vdd_dep_on_dispclk);
>> - pinfo->vdd_dep_on_dispclk = NULL;
>> - }
>> - if (pinfo->vdd_dep_on_dppclk) {
>> - kfree(pinfo->vdd_dep_on_dppclk);
>> - pinfo->vdd_dep_on_dppclk = NULL;
>> - }
>> - if (pinfo->vdd_dep_on_phyclk) {
>> - kfree(pinfo->vdd_dep_on_phyclk);
>> - pinfo->vdd_dep_on_phyclk = NULL;
>> - }
>> -
>> - if (NULL != hwmgr->dyn_state.vddc_dep_on_dal_pwrl) {
>> - kfree(hwmgr->dyn_state.vddc_dep_on_dal_pwrl);
>> - hwmgr->dyn_state.vddc_dep_on_dal_pwrl = NULL;
>> - }
>> -
>> - if (NULL != hwmgr->dyn_state.vq_budgeting_table) {
>> - kfree(hwmgr->dyn_state.vq_budgeting_table);
>> - hwmgr->dyn_state.vq_budgeting_table = NULL;
>> - }
>> + kfree(pinfo->vdd_dep_on_dcefclk);
>> + pinfo->vdd_dep_on_dcefclk = NULL;
>> + kfree(pinfo->vdd_dep_on_socclk);
>> + pinfo->vdd_dep_on_socclk = NULL;
>> + kfree(pinfo->vdd_dep_on_fclk);
>> + pinfo->vdd_dep_on_fclk = NULL;
>> + kfree(pinfo->vdd_dep_on_dispclk);
>> + pinfo->vdd_dep_on_dispclk = NULL;
>> + kfree(pinfo->vdd_dep_on_dppclk);
>> + pinfo->vdd_dep_on_dppclk = NULL;
>> + kfree(pinfo->vdd_dep_on_phyclk);
>> + pinfo->vdd_dep_on_phyclk = NULL;
>> +
>> + kfree(hwmgr->dyn_state.vddc_dep_on_dal_pwrl);
>> + hwmgr->dyn_state.vddc_dep_on_dal_pwrl = NULL;
>> +
>> + kfree(hwmgr->dyn_state.vq_budgeting_table);
>> + hwmgr->dyn_state.vq_budgeting_table = NULL;
>>
>> kfree(hwmgr->backend);
>> hwmgr->backend = NULL;
>> diff --git a/drivers/gpu/drm/amd/powerplay/hwmgr/smu7_hwmgr.c b/drivers/gpu/drm/amd/powerplay/hwmgr/smu7_hwmgr.c
>> index c274323..eb8a3ff 100644
>> --- a/drivers/gpu/drm/amd/powerplay/hwmgr/smu7_hwmgr.c
>> +++ b/drivers/gpu/drm/amd/powerplay/hwmgr/smu7_hwmgr.c
>> @@ -2282,15 +2282,11 @@ static int smu7_set_private_data_based_on_pptable_v0(struct pp_hwmgr *hwmgr)
>>
>> static int smu7_hwmgr_backend_fini(struct pp_hwmgr *hwmgr)
>> {
>> - if (NULL != hwmgr->dyn_state.vddc_dep_on_dal_pwrl) {
>> - kfree(hwmgr->dyn_state.vddc_dep_on_dal_pwrl);
>> - hwmgr->dyn_state.vddc_dep_on_dal_pwrl = NULL;
>> - }
>> + kfree(hwmgr->dyn_state.vddc_dep_on_dal_pwrl);
>> + hwmgr->dyn_state.vddc_dep_on_dal_pwrl = NULL;
>> pp_smu7_thermal_fini(hwmgr);
>> - if (NULL != hwmgr->backend) {
>> - kfree(hwmgr->backend);
>> - hwmgr->backend = NULL;
>> - }
>> + kfree(hwmgr->backend);
>> + hwmgr->backend = NULL;
>>
>> return 0;
>> }
>>
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