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

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Message-Id: <1649310112-25848-1-git-send-email-ssengar@linux.microsoft.com>
Date:   Wed,  6 Apr 2022 22:41:52 -0700
From:   Saurabh Sengar <ssengar@...ux.microsoft.com>
To:     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
Subject: [PATCH] drm/hyperv: Added error message for fb size greater then allocated

From: saurabh <saurabh@...alhost.localdomain>

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 <saurabh@...alhost.localdomain>
---
 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 e82b815f83a6..92587f0b7694 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);
 		return -EINVAL;
+	}
 
 	return 0;
 }
-- 
2.31.1