[PATCH][next] drm/omap: clean up error exit path on omap_encoder allocation failure

[PATCH][next] drm/omap: clean up error exit path on omap_encoder allocation failure

[Colin Ian King]

Currently when an allocation failure occurs for omap_encoder the exit
path will destroy encoder via omap_encoder_destroy  if it is not null.
However, encoder is always null at this point, so the check and destroy
is redundant and can be removed. Clean up the code by removing the exit
path and redundant omap_encoder_destroy call, and just return NULL.

Signed-off-by: Colin Ian King <colin.i.king@gmail.com>
---
 drivers/gpu/drm/omapdrm/omap_encoder.c | 8 +-------
 1 file changed, 1 insertion(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/omapdrm/omap_encoder.c b/drivers/gpu/drm/omapdrm/omap_encoder.c
index 4dd05bc732da..a99022638a2c 100644
--- a/drivers/gpu/drm/omapdrm/omap_encoder.c
+++ b/drivers/gpu/drm/omapdrm/omap_encoder.c
@@ -126,21 +126,15 @@ struct drm_encoder *omap_encoder_init(struct drm_device *dev,
 
 	omap_encoder = kzalloc(sizeof(*omap_encoder), GFP_KERNEL);
 	if (!omap_encoder)
-		goto fail;
+		return NULL;
 
 	omap_encoder->output = output;
 
 	encoder = &omap_encoder->base;
 
 	drm_encoder_init(dev, encoder, &omap_encoder_funcs,
 			 DRM_MODE_ENCODER_TMDS, NULL);
 	drm_encoder_helper_add(encoder, &omap_encoder_helper_funcs);
 
 	return encoder;
-
-fail:
-	if (encoder)
-		omap_encoder_destroy(encoder);
-
-	return NULL;
 }
-- 
2.39.5

Re: [PATCH][next] drm/omap: clean up error exit path on omap_encoder allocation failure

[Tomi Valkeinen]

Hi,

On 15/10/2024 17:10, Colin Ian King wrote:
> Currently when an allocation failure occurs for omap_encoder the exit
> path will destroy encoder via omap_encoder_destroy  if it is not null.
> However, encoder is always null at this point, so the check and destroy
> is redundant and can be removed. Clean up the code by removing the exit
> path and redundant omap_encoder_destroy call, and just return NULL.
> 
> Signed-off-by: Colin Ian King <colin.i.king@gmail.com>
> ---
>   drivers/gpu/drm/omapdrm/omap_encoder.c | 8 +-------
>   1 file changed, 1 insertion(+), 7 deletions(-)

This is correct, but I think it would make sense to fix the error 
handling in omap_encoder_init() fully, instead of just partially: 
drm_encoder_init() can return an error, in which case we should free the 
omap_encoder.

Could you update the patch to do that too?

  Tomi

> diff --git a/drivers/gpu/drm/omapdrm/omap_encoder.c b/drivers/gpu/drm/omapdrm/omap_encoder.c
> index 4dd05bc732da..a99022638a2c 100644
> --- a/drivers/gpu/drm/omapdrm/omap_encoder.c
> +++ b/drivers/gpu/drm/omapdrm/omap_encoder.c
> @@ -126,21 +126,15 @@ struct drm_encoder *omap_encoder_init(struct drm_device *dev,
>   
>   	omap_encoder = kzalloc(sizeof(*omap_encoder), GFP_KERNEL);
>   	if (!omap_encoder)
> -		goto fail;
> +		return NULL;
>   
>   	omap_encoder->output = output;
>   
>   	encoder = &omap_encoder->base;
>   
>   	drm_encoder_init(dev, encoder, &omap_encoder_funcs,
>   			 DRM_MODE_ENCODER_TMDS, NULL);
>   	drm_encoder_helper_add(encoder, &omap_encoder_helper_funcs);
>   
>   	return encoder;
> -
> -fail:
> -	if (encoder)
> -		omap_encoder_destroy(encoder);
> -
> -	return NULL;
>   }