[PATCH] drm/amd/powerplay/hwmgr: Remove null check before kfree

Zhu, Rex Rex.Zhu at amd.com
Tue Aug 29 14:54:28 UTC 2017


Reviewed-by:  Rex Zhu <Rex.Zhu at amd.com<mailto:Rex.Zhu at amd.com>>


Best Regards

Rex

________________________________
From: Wentland, Harry
Sent: Tuesday, August 29, 2017 9:34:01 PM
To: Himanshu Jha; airlied at linux.ie
Cc: linux-kernel at vger.kernel.org; dri-devel at lists.freedesktop.org; amd-gfx at lists.freedesktop.org; Deucher, Alexander; Zhu, Rex; Koenig, Christian
Subject: Re: [PATCH] drm/amd/powerplay/hwmgr: Remove null check before kfree

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 at gmail.com>

Reviewed-by: Harry Wentland <harry.wentland at amd.com>

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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