linux-kernel - [PATCH] drm/vkms: Add missing check for CRTC initialization

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Message-ID: <20240917160208.2905-1-jose.exposito89@gmail.com>
Date: Tue, 17 Sep 2024 18:02:06 +0200
From: José Expósito <jose.exposito89@...il.com>
To: louis.chauvet@...tlin.com
Cc: airlied@...il.com,
	daniel@...ll.ch,
	dri-devel@...ts.freedesktop.org,
	hamohammed.sa@...il.com,
	linux-kernel@...r.kernel.org,
	maarten.lankhorst@...ux.intel.com,
	mairacanal@...eup.net,
	melissa.srw@...il.com,
	mripard@...nel.org,
	rodrigosiqueiramelo@...il.com,
	thomas.petazzoni@...tlin.com,
	tzimmermann@...e.de,
	José Expósito <jose.exposito89@...il.com>
Subject: [PATCH] drm/vkms: Add missing check for CRTC initialization

Hi Louis,

> CRTC initialization call drm_mode_crtc_set_gamma_size without the proper
> checks, introduce this check to avoid issues.
> 
> Signed-off-by: Louis Chauvet <louis.chauvet@...tlin.com>

Reviewed-by: José Expósito <jose.exposito89@...il.com>

> ---
>  drivers/gpu/drm/vkms/vkms_crtc.c | 7 ++++++-
>  1 file changed, 6 insertions(+), 1 deletion(-)
> 
> 
> ---
> base-commit: a6bb1f77a94335de67dba12e7f52651c115b82d2
> change-id: 20240906-vkms-add-missing-check-e1b6ee8d1b39
> 
> Best regards,
> 
> diff --git a/drivers/gpu/drm/vkms/vkms_crtc.c b/drivers/gpu/drm/vkms/vkms_crtc.c
> index 40b4d084e3ce..e4f93dfbd071 100644
> --- a/drivers/gpu/drm/vkms/vkms_crtc.c
> +++ b/drivers/gpu/drm/vkms/vkms_crtc.c
> @@ -287,7 +287,12 @@ int vkms_crtc_init(struct drm_device *dev, struct drm_crtc *crtc,
>  
>  	drm_crtc_helper_add(crtc, &vkms_crtc_helper_funcs);
>  
> -	drm_mode_crtc_set_gamma_size(crtc, VKMS_LUT_SIZE);
> +	ret = drm_mode_crtc_set_gamma_size(crtc, VKMS_LUT_SIZE);
> +	if (ret) {
> +		DRM_ERROR("Failed to set gamma size\n");

This will conflit with "drm/vkms: Switch to dynamic allocation
for CRTC" [1], where you switched to DRM_DEV_ERROR.

No proferences about the log function, just a heads up so when
you rebase one of the patches we keep logging consistent.

[1] https://patchwork.kernel.org/project/dri-devel/patch/20240912-b4-vkms-allocated-v1-3-29abbaa14af9@bootlin.com/

> +		return ret;
> +	}
> +
>  	drm_crtc_enable_color_mgmt(crtc, 0, false, VKMS_LUT_SIZE);
>  
>  	spin_lock_init(&vkms_out->lock);
>