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

[Saurabh Sengar <ssengar@linux.microsoft.com>]

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@linux.microsoft.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 76a182a..013a782 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;
 }
-- 
1.8.3.1