linux-kernel - Re: [PATCH v2] drm/hyperv: Added error message for fb size greater then allocated

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Date:   Thu, 7 Apr 2022 13:14:18 +0000
From:   Wei Liu <wei.liu@...nel.org>
To:     Saurabh Sengar <ssengar@...ux.microsoft.com>
Cc:     ssengar@...rosoft.com, drawat.floss@...il.com, airlied@...ux.ie,
        daniel@...ll.ch, linux-hyperv@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        mikelley@...rosoft.com, decui@...rosoft.com,
        Wei Liu <wei.liu@...nel.org>
Subject: Re: [PATCH v2] drm/hyperv: Added error message for fb size greater
 then allocated

On Wed, Apr 06, 2022 at 11:27:07PM -0700, Saurabh Sengar wrote:
> Added error message when the size of requested framebuffer is more then
> the allocated size by vmbus mmio region for framebuffer
> 
> Signed-off-by: Saurabh Sengar <ssengar@...ux.microsoft.com>
> ---
> v1 -> v2 : Corrected Sign-off
> 
>  drivers/gpu/drm/hyperv/hyperv_drm_modeset.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/hyperv/hyperv_drm_modeset.c b/drivers/gpu/drm/hyperv/hyperv_drm_modeset.c
> index e82b815..92587f0 100644
> --- a/drivers/gpu/drm/hyperv/hyperv_drm_modeset.c
> +++ b/drivers/gpu/drm/hyperv/hyperv_drm_modeset.c
> @@ -123,8 +123,11 @@ static int hyperv_pipe_check(struct drm_simple_display_pipe *pipe,
>  	if (fb->format->format != DRM_FORMAT_XRGB8888)
>  		return -EINVAL;
>  
> -	if (fb->pitches[0] * fb->height > hv->fb_size)
> +	if (fb->pitches[0] * fb->height > hv->fb_size) {
> +		drm_err(&hv->dev, "hv->hdev, fb size requested by process %s for %d X %d (pitch %d) is greater then allocated size %ld\n",

then -> than.

> +		current->comm, fb->width, fb->height, fb->pitches[0], hv->fb_size);
>  		return -EINVAL;
> +	}
>  
>  	return 0;
>  }
> -- 
> 1.8.3.1
>