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video: hyperv_fb: Add ratelimit on error message

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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.  As a result, in some circumstances the error message is output
continuously.

Break the cycle by rate limiting the error message.  Also output
the error code for additional diagnosability.

Signed-off-by: Michael Kelley <mikelley@microsoft.com>
Link: https://lore.kernel.org/r/1618933459-10585-1-git-send-email-mikelley@microsoft.com
Signed-off-by: Wei Liu <wei.liu@kernel.org>
This commit is contained in:
Michael Kelley 2021-04-20 08:44:19 -07:00 committed by Wei Liu
parent 77db0ec8b7
commit aa5b7d11c7
1 changed files with 1 additions and 1 deletions
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2
drivers/video/fbdev/hyperv_fb.c
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@ -308,7 +308,7 @@ static inline int synthvid_send(struct hv_device *hdev,
VM_PKT_DATA_INBAND, 0);
if (ret)
pr_err("Unable to send packet via vmbus\n");
pr_err_ratelimited("Unable to send packet via vmbus; error %d\n", ret);
return ret;
}