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

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Message-ID: <CAHFnvW2V0tz25D4YMxYMNqYs5uMkbjEoc6p93e6naBhvybzmoQ@mail.gmail.com>
Date:   Thu, 7 Apr 2022 09:28:53 -0700
From:   Deepak Rawat <drawat.floss@...il.com>
To:     Saurabh Sengar <ssengar@...ux.microsoft.com>
Cc:     ssengar@...rosoft.com, David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>, linux-hyperv@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Michael Kelley <mikelley@...rosoft.com>,
        Dexuan Cui <decui@...rosoft.com>
Subject: Re: [PATCH v2] drm/hyperv: Added error message for fb size greater
 then allocated

On Wed, Apr 6, 2022 at 11:27 PM Saurabh Sengar
<ssengar@...ux.microsoft.com> 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",
> +               current->comm, fb->width, fb->height, fb->pitches[0], hv->fb_size);

Any reason to add an error message here. Since this function is called
whenever there is an update, avoid printing an error here.

>                 return -EINVAL;
> +       }
>
>         return 0;
>  }
> --
> 1.8.3.1
>