linux-kernel - [PATCH v3] drm/hyperv: Added error message for fb size greater than allocated

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Message-Id: <1649650437-17977-1-git-send-email-ssengar@linux.microsoft.com>
Date:   Sun, 10 Apr 2022 21:13:57 -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 v3] drm/hyperv: Added error message for fb size greater than allocated

Added 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@...ux.microsoft.com>
---
v2 -> v3 : then -> than (typo fix)

 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..6634818 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 than allocated size %ld\n",
+		current->comm, fb->width, fb->height, fb->pitches[0], hv->fb_size);
 		return -EINVAL;
+	}
 
 	return 0;
 }
-- 
1.8.3.1