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SubjectRe: [Freedreno] [PATCH] drm/msm/dp: Drop unnecessary NULL checks after container_of
On 2021-05-24 20:20, Guenter Roeck wrote:
> The result of container_of() operations is never NULL unless the
> embedded
> element is the first element of the structure. This is not the case
> here.
> The NULL check on the result of container_of() is therefore unnecessary
> and misleading. Remove it.
>
> This change was made automatically with the following Coccinelle
> script.
>
> @@
> type t;
> identifier v;
> statement s;
> @@
>
> <+...
> (
> t v = container_of(...);
> |
> v = container_of(...);
> )
> ...
> when != v
> - if (\( !v \| v == NULL \) ) s
> ...+>
>
> While at it, remove unused but assigned variable hpd in
> dp_display_usbpd_attention_cb().
>
> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Reviewed-by: Abhinav Kumar <abhinavk@codeaurora.org>
> ---
> drivers/gpu/drm/msm/dp/dp_display.c | 25 -------------------------
> 1 file changed, 25 deletions(-)
>
> diff --git a/drivers/gpu/drm/msm/dp/dp_display.c
> b/drivers/gpu/drm/msm/dp/dp_display.c
> index 1784e119269b..a74e7ef96fcf 100644
> --- a/drivers/gpu/drm/msm/dp/dp_display.c
> +++ b/drivers/gpu/drm/msm/dp/dp_display.c
> @@ -208,10 +208,6 @@ static int dp_display_bind(struct device *dev,
> struct device *master,
>
> dp = container_of(g_dp_display,
> struct dp_display_private, dp_display);
> - if (!dp) {
> - DRM_ERROR("DP driver bind failed. Invalid driver data\n");
> - return -EINVAL;
> - }
>
> dp->dp_display.drm_dev = drm;
> priv = drm->dev_private;
> @@ -252,10 +248,6 @@ static void dp_display_unbind(struct device *dev,
> struct device *master,
>
> dp = container_of(g_dp_display,
> struct dp_display_private, dp_display);
> - if (!dp) {
> - DRM_ERROR("Invalid DP driver data\n");
> - return;
> - }
>
> dp_power_client_deinit(dp->power);
> dp_aux_unregister(dp->aux);
> @@ -406,11 +398,6 @@ static int dp_display_usbpd_configure_cb(struct
> device *dev)
>
> dp = container_of(g_dp_display,
> struct dp_display_private, dp_display);
> - if (!dp) {
> - DRM_ERROR("no driver data found\n");
> - rc = -ENODEV;
> - goto end;
> - }
>
> dp_display_host_init(dp, false);
>
> @@ -437,11 +424,6 @@ static int dp_display_usbpd_disconnect_cb(struct
> device *dev)
>
> dp = container_of(g_dp_display,
> struct dp_display_private, dp_display);
> - if (!dp) {
> - DRM_ERROR("no driver data found\n");
> - rc = -ENODEV;
> - return rc;
> - }
>
> dp_add_event(dp, EV_USER_NOTIFICATION, false, 0);
>
> @@ -502,7 +484,6 @@ static int dp_display_usbpd_attention_cb(struct
> device *dev)
> int rc = 0;
> u32 sink_request;
> struct dp_display_private *dp;
> - struct dp_usbpd *hpd;
>
> if (!dev) {
> DRM_ERROR("invalid dev\n");
> @@ -511,12 +492,6 @@ static int dp_display_usbpd_attention_cb(struct
> device *dev)
>
> dp = container_of(g_dp_display,
> struct dp_display_private, dp_display);
> - if (!dp) {
> - DRM_ERROR("no driver data found\n");
> - return -ENODEV;
> - }
> -
> - hpd = dp->usbpd;
>
> /* check for any test request issued by sink */
> rc = dp_link_process_request(dp->link);

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