drm/hyperv: Add error message for fb size greater than allocated

Add error message when the size of requested framebuffer is more than
the allocated size by vmbus mmio region for framebuffer.

Signed-off-by: Saurabh Sengar <ssengar@linux.microsoft.com>
Reviewed-by: Dexuan Cui <decui@microsoft.com>
Link: https://lore.kernel.org/r/1649737739-10113-1-git-send-email-ssengar@linux.microsoft.com
Signed-off-by: Wei Liu <wei.liu@kernel.org>

diff --git a/drivers/gpu/drm/hyperv/hyperv_drm_modeset.c b/drivers/gpu/drm/hyperv/hyperv_drm_modeset.c
index e82b815..27f4fcb 100644 (file)
--- 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, "fb size requested by %s for %dX%d (pitch %d) greater than %ld\n",
+                       current->comm, fb->width, fb->height, fb->pitches[0], hv->fb_size);
                return -EINVAL;
+       }
 
        return 0;
 }