[PATCH 2/2] drm/hyperv: Add ratelimit on error message

[Tim Gardner]

From: Saurabh Sengar <ssengar at linux.microsoft.com>

BugLink: https://bugs.launchpad.net/bugs/2019009

Due to a full ring buffer, the driver may be unable to send updates to
the Hyper-V host.  But outputing the error message can make the problem
worse because console output is also typically written to the frame
buffer.
Rate limiting the error message, also output the error code for additional
diagnosability.

Signed-off-by: Saurabh Sengar <ssengar at linux.microsoft.com>
Reviewed-by: Michael Kelley <mikelley at microsoft.com>
Link: https://lore.kernel.org/r/1662736193-31379-1-git-send-email-ssengar@linux.microsoft.com
Signed-off-by: Wei Liu <wei.liu at kernel.org>
(cherry picked from commit 4c3386f64a432b3697fede579d06f9c1058043ad)
Signed-off-by: Tim Gardner <tim.gardner at canonical.com>
---
 drivers/gpu/drm/hyperv/hyperv_drm_proto.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/hyperv/hyperv_drm_proto.c b/drivers/gpu/drm/hyperv/hyperv_drm_proto.c
index 76a182a9a765..013a7829182d 100644
--- a/drivers/gpu/drm/hyperv/hyperv_drm_proto.c
+++ b/drivers/gpu/drm/hyperv/hyperv_drm_proto.c
@@ -208,7 +208,7 @@ static inline int hyperv_sendpacket(struct hv_device *hdev, struct synthvid_msg
 			       VM_PKT_DATA_INBAND, 0);
 
 	if (ret)
-		drm_err(&hv->dev, "Unable to send packet via vmbus\n");
+		drm_err_ratelimited(&hv->dev, "Unable to send packet via vmbus; error %d\n", ret);
 
 	return ret;
 }
-- 
2.34.1