[PATCH] drm/msm/dp: Fix warnings reported by kbot in DP driver

[Stephen Boyd]

Maybe subject could be "Ignore debugfs failures, fix indentation, fix
logical error"?

Quoting Abhinav Kumar (2021-03-04 17:31:52)
> Fix the warnings reported by kbot across MSM DP driver.

Which warnings? Can you include them? Or at least list the three things
that are being fixed in this patch?

> 
> Reported-by: kernel test robot <lkp at intel.com>
> Reported-by: Dan Carpenter <dan.carpenter at oracle.com>
> Signed-off-by: Abhinav Kumar <abhinavk at codeaurora.org>
> ---
>  drivers/gpu/drm/msm/dp/dp_debug.c | 33 +++++----------------------------
>  drivers/gpu/drm/msm/dp/dp_hpd.c   |  4 ++--
>  drivers/gpu/drm/msm/dp/dp_power.c |  2 +-
>  3 files changed, 8 insertions(+), 31 deletions(-)
> 
> diff --git a/drivers/gpu/drm/msm/dp/dp_debug.c b/drivers/gpu/drm/msm/dp/dp_debug.c
> index 84670bc..2f6247e 100644
> --- a/drivers/gpu/drm/msm/dp/dp_debug.c
> +++ b/drivers/gpu/drm/msm/dp/dp_debug.c
> @@ -226,7 +226,7 @@ static int dp_test_data_show(struct seq_file *m, void *data)
>                                         debug->link->test_video.test_h_width);
>                         seq_printf(m, "vdisplay: %d\n",
>                                         debug->link->test_video.test_v_height);
> -                                       seq_printf(m, "bpc: %u\n",
> +                       seq_printf(m, "bpc: %u\n",
>                                         dp_link_bit_depth_to_bpc(bpc));
>                 } else
>                         seq_puts(m, "0");

Indentation.

> @@ -368,44 +368,21 @@ static int dp_debug_init(struct dp_debug *dp_debug, struct drm_minor *minor)
>         int rc = 0;
>         struct dp_debug_private *debug = container_of(dp_debug,
>                         struct dp_debug_private, dp_debug);
> -       struct dentry *file;
> -       struct dentry *test_active;
> -       struct dentry *test_data, *test_type;
>  
> -       file = debugfs_create_file("dp_debug", 0444, minor->debugfs_root,
> +       debugfs_create_file("dp_debug", 0444, minor->debugfs_root,
>                         debug, &dp_debug_fops);
> -       if (IS_ERR_OR_NULL(file)) {
> -               rc = PTR_ERR(file);
> -               DRM_ERROR("[%s] debugfs create file failed, rc=%d\n",
> -                                 DEBUG_NAME, rc);
> -       }
>  
> -       test_active = debugfs_create_file("msm_dp_test_active", 0444,
> +       debugfs_create_file("msm_dp_test_active", 0444,
>                         minor->debugfs_root,
>                         debug, &test_active_fops);
> -       if (IS_ERR_OR_NULL(test_active)) {
> -               rc = PTR_ERR(test_active);
> -               DRM_ERROR("[%s] debugfs test_active failed, rc=%d\n",
> -                                 DEBUG_NAME, rc);
> -       }
>  
> -       test_data = debugfs_create_file("msm_dp_test_data", 0444,
> +       debugfs_create_file("msm_dp_test_data", 0444,
>                         minor->debugfs_root,
>                         debug, &dp_test_data_fops);
> -       if (IS_ERR_OR_NULL(test_data)) {
> -               rc = PTR_ERR(test_data);
> -               DRM_ERROR("[%s] debugfs test_data failed, rc=%d\n",
> -                                 DEBUG_NAME, rc);
> -       }
>  
> -       test_type = debugfs_create_file("msm_dp_test_type", 0444,
> +       debugfs_create_file("msm_dp_test_type", 0444,
>                         minor->debugfs_root,
>                         debug, &dp_test_type_fops);
> -       if (IS_ERR_OR_NULL(test_type)) {
> -               rc = PTR_ERR(test_type);
> -               DRM_ERROR("[%s] debugfs test_type failed, rc=%d\n",
> -                                 DEBUG_NAME, rc);
> -       }

Debugfs failures.

>  
>         debug->root = minor->debugfs_root;
>  
> diff --git a/drivers/gpu/drm/msm/dp/dp_hpd.c b/drivers/gpu/drm/msm/dp/dp_hpd.c
> index 5b8fe3202..e1c90fa 100644
> --- a/drivers/gpu/drm/msm/dp/dp_hpd.c
> +++ b/drivers/gpu/drm/msm/dp/dp_hpd.c
> @@ -34,8 +34,8 @@ int dp_hpd_connect(struct dp_usbpd *dp_usbpd, bool hpd)
>  
>         dp_usbpd->hpd_high = hpd;
>  
> -       if (!hpd_priv->dp_cb && !hpd_priv->dp_cb->configure
> -                               && !hpd_priv->dp_cb->disconnect) {
> +       if (!hpd_priv->dp_cb || !hpd_priv->dp_cb->configure
> +                               || !hpd_priv->dp_cb->disconnect) {

Logical error.

>                 pr_err("hpd dp_cb not initialized\n");
>                 return -EINVAL;
>         }
> diff --git a/drivers/gpu/drm/msm/dp/dp_power.c b/drivers/gpu/drm/msm/dp/dp_power.c
> index 9c4ea00..3961ba4 100644
> --- a/drivers/gpu/drm/msm/dp/dp_power.c
> +++ b/drivers/gpu/drm/msm/dp/dp_power.c
> @@ -269,7 +269,7 @@ int dp_power_clk_enable(struct dp_power *dp_power,
>                 DRM_ERROR("failed to '%s' clks for: %s. err=%d\n",
>                         enable ? "enable" : "disable",
>                         dp_parser_pm_name(pm_type), rc);
> -                       return rc;
> +               return rc;

Indentation.

>         }
>  
>         if (pm_type == DP_CORE_PM)