Re: [PATCH v5 3/8] drm/komeda: use drmm_writeback_connector_init()

[Liviu Dudau <liviu.dudau@arm.com>]

On Tue, May 05, 2026 at 03:25:00AM +0300, Dmitry Baryshkov wrote:
> The driver uses drm_writeback_connector_init() instead of its drmm
> counterpart, but it doesn't perform the job queue cleanup (neither
> manually nor by calling drm_writeback_connector_cleanup()). On the
> contrary, the drmm_writeback_connector_init() function ensures the
> proper cleanup of the job queue.
> 
> Use drmm_plain_encoder_alloc() to allocate simple encoder and
> drmm_writeback_connector_init() in order to initialize writeback
> connector instance.
> 
> Reviewed-by: Suraj Kandpal <suraj.kandpal@intel.com>
> Reviewed-by: Louis Chauvet <louis.chauvet@bootlin.com>
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>

Reviewed-by: Liviu Dudau <liviu.dudau@arm.com>

Best regards,
Liviu

> ---
>  .../drm/arm/display/komeda/komeda_wb_connector.c   | 30 ++++++++++++----------
>  1 file changed, 17 insertions(+), 13 deletions(-)
> 
> diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_wb_connector.c b/drivers/gpu/drm/arm/display/komeda/komeda_wb_connector.c
> index 41cc3e080dc9..bcc53d4015f1 100644
> --- a/drivers/gpu/drm/arm/display/komeda/komeda_wb_connector.c
> +++ b/drivers/gpu/drm/arm/display/komeda/komeda_wb_connector.c
> @@ -5,6 +5,7 @@
>   *
>   */
>  #include <drm/drm_framebuffer.h>
> +#include <drm/drm_managed.h>
>  #include "komeda_dev.h"
>  #include "komeda_kms.h"
>  
> @@ -121,17 +122,10 @@ komeda_wb_connector_fill_modes(struct drm_connector *connector,
>  	return 0;
>  }
>  
> -static void komeda_wb_connector_destroy(struct drm_connector *connector)
> -{
> -	drm_connector_cleanup(connector);
> -	kfree(to_kconn(to_wb_conn(connector)));
> -}
> -
>  static const struct drm_connector_funcs komeda_wb_connector_funcs = {
>  	.reset			= drm_atomic_helper_connector_reset,
>  	.detect			= komeda_wb_connector_detect,
>  	.fill_modes		= komeda_wb_connector_fill_modes,
> -	.destroy		= komeda_wb_connector_destroy,
>  	.atomic_duplicate_state	= drm_atomic_helper_connector_duplicate_state,
>  	.atomic_destroy_state	= drm_atomic_helper_connector_destroy_state,
>  };
> @@ -143,13 +137,15 @@ static int komeda_wb_connector_add(struct komeda_kms_dev *kms,
>  	struct komeda_wb_connector *kwb_conn;
>  	struct drm_writeback_connector *wb_conn;
>  	struct drm_display_info *info;
> +	struct drm_encoder *encoder;
> +
>  	u32 *formats, n_formats = 0;
>  	int err;
>  
>  	if (!kcrtc->master->wb_layer)
>  		return 0;
>  
> -	kwb_conn = kzalloc_obj(*kwb_conn);
> +	kwb_conn = drmm_kzalloc(&kms->base, sizeof(*kwb_conn), GFP_KERNEL);
>  	if (!kwb_conn)
>  		return -ENOMEM;
>  
> @@ -165,11 +161,19 @@ static int komeda_wb_connector_add(struct komeda_kms_dev *kms,
>  		return -ENOMEM;
>  	}
>  
> -	err = drm_writeback_connector_init(&kms->base, wb_conn,
> -					   &komeda_wb_connector_funcs,
> -					   &komeda_wb_encoder_helper_funcs,
> -					   formats, n_formats,
> -					   BIT(drm_crtc_index(&kcrtc->base)));
> +	encoder = drmm_plain_encoder_alloc(&kms->base, NULL,
> +					   DRM_MODE_ENCODER_VIRTUAL, NULL);
> +	if (IS_ERR(encoder))
> +		return PTR_ERR(encoder);
> +
> +	drm_encoder_helper_add(encoder, &komeda_wb_encoder_helper_funcs);
> +
> +	encoder->possible_crtcs = drm_crtc_mask(&kcrtc->base);
> +
> +	err = drmm_writeback_connector_init(&kms->base, wb_conn,
> +					    &komeda_wb_connector_funcs,
> +					    encoder,
> +					    formats, n_formats);
>  	komeda_put_fourcc_list(formats);
>  	if (err) {
>  		kfree(kwb_conn);
> 
> -- 
> 2.47.3
> 

-- 
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