[PATCH] drm/bridge: Remove a small useless code snippet

[PATCH] drm/bridge: Remove a small useless code snippet

[Sui Jingfeng]

Because the check on the non-existence (encoder == NULL) has already been
done in the implementation of drm_bridge_attach() function, and
drm_bridge_attach() is called earlier. The driver won't get to check point
even if drm_bridge_attach() fails for some reasons, as it will clear the
bridge->encoder to NULL and return a negective error code.

Therefore, there is no need to check another again. Remove the redundant
codes at the later.

Signed-off-by: Sui Jingfeng <sui.jingfeng@linux.dev>
---
 drivers/gpu/drm/bridge/simple-bridge.c | 5 -----
 1 file changed, 5 deletions(-)

diff --git a/drivers/gpu/drm/bridge/simple-bridge.c b/drivers/gpu/drm/bridge/simple-bridge.c
index 28376d0ecd09..3caa918ac2e0 100644
--- a/drivers/gpu/drm/bridge/simple-bridge.c
+++ b/drivers/gpu/drm/bridge/simple-bridge.c
@@ -116,11 +116,6 @@ static int simple_bridge_attach(struct drm_bridge *bridge,
 	if (flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)
 		return 0;
 
-	if (!bridge->encoder) {
-		DRM_ERROR("Missing encoder\n");
-		return -ENODEV;
-	}
-
 	drm_connector_helper_add(&sbridge->connector,
 				 &simple_bridge_con_helper_funcs);
 	ret = drm_connector_init_with_ddc(bridge->dev, &sbridge->connector,
-- 
2.43.0

Re: [PATCH] drm/bridge: Remove a small useless code snippet

[Laurent Pinchart]

Hi Sui,

Thank you for the patch.

On Sat, May 11, 2024 at 08:42:38PM +0800, Sui Jingfeng wrote:
> Because the check on the non-existence (encoder == NULL) has already been
> done in the implementation of drm_bridge_attach() function, and
> drm_bridge_attach() is called earlier. The driver won't get to check point
> even if drm_bridge_attach() fails for some reasons, as it will clear the
> bridge->encoder to NULL and return a negective error code.

s/negective/negative/

> 
> Therefore, there is no need to check another again. Remove the redundant
> codes at the later.
> 
> Signed-off-by: Sui Jingfeng <sui.jingfeng@linux.dev>

Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

If you end up sending a second version of this patch, please include all
similar patches you have sent at the same time in a patch series,
instead of sending them separately.

> ---
>  drivers/gpu/drm/bridge/simple-bridge.c | 5 -----
>  1 file changed, 5 deletions(-)
> 
> diff --git a/drivers/gpu/drm/bridge/simple-bridge.c b/drivers/gpu/drm/bridge/simple-bridge.c
> index 28376d0ecd09..3caa918ac2e0 100644
> --- a/drivers/gpu/drm/bridge/simple-bridge.c
> +++ b/drivers/gpu/drm/bridge/simple-bridge.c
> @@ -116,11 +116,6 @@ static int simple_bridge_attach(struct drm_bridge *bridge,
>  	if (flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)
>  		return 0;
>  
> -	if (!bridge->encoder) {
> -		DRM_ERROR("Missing encoder\n");
> -		return -ENODEV;
> -	}
> -
>  	drm_connector_helper_add(&sbridge->connector,
>  				 &simple_bridge_con_helper_funcs);
>  	ret = drm_connector_init_with_ddc(bridge->dev, &sbridge->connector,

-- 
Regards,

Laurent Pinchart

Re: [PATCH] drm/bridge: Remove a small useless code snippet

[Sui Jingfeng]

Hi,


On 2024/5/13 05:09, Laurent Pinchart wrote:
> Hi Sui,
>
> Thank you for the patch.
>
> On Sat, May 11, 2024 at 08:42:38PM +0800, Sui Jingfeng wrote:
>> Because the check on the non-existence (encoder == NULL) has already been
>> done in the implementation of drm_bridge_attach() function, and
>> drm_bridge_attach() is called earlier. The driver won't get to check point
>> even if drm_bridge_attach() fails for some reasons, as it will clear the
>> bridge->encoder to NULL and return a negective error code.
> s/negective/negative/
>

Sorry, my bad.


>> Therefore, there is no need to check another again. Remove the redundant
>> codes at the later.
>>
>> Signed-off-by: Sui Jingfeng <sui.jingfeng@linux.dev>
> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
>
> If you end up sending a second version of this patch, please include all
> similar patches you have sent at the same time in a patch series,
> instead of sending them separately.

I will send a second version to correct spell error and collect and fold them into a series.

By the way, thanks a lot for you time review my patch and thanks a lot for the generous.

So happy be reviewed and its my pleasure to have opportunities to talk with you. Thanks a lot!


>> ---
>>   drivers/gpu/drm/bridge/simple-bridge.c | 5 -----
>>   1 file changed, 5 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/bridge/simple-bridge.c b/drivers/gpu/drm/bridge/simple-bridge.c
>> index 28376d0ecd09..3caa918ac2e0 100644
>> --- a/drivers/gpu/drm/bridge/simple-bridge.c
>> +++ b/drivers/gpu/drm/bridge/simple-bridge.c
>> @@ -116,11 +116,6 @@ static int simple_bridge_attach(struct drm_bridge *bridge,
>>   	if (flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)
>>   		return 0;
>>   
>> -	if (!bridge->encoder) {
>> -		DRM_ERROR("Missing encoder\n");
>> -		return -ENODEV;
>> -	}
>> -
>>   	drm_connector_helper_add(&sbridge->connector,
>>   				 &simple_bridge_con_helper_funcs);
>>   	ret = drm_connector_init_with_ddc(bridge->dev, &sbridge->connector,

-- 
Best regards,
Sui