From: Michael Kelley <mikelley@microsoft.com>
To: kys@microsoft.com, haiyangz@microsoft.com,
sthemmin@microsoft.com, wei.liu@kernel.org,
linux-kernel@vger.kernel.org, linux-hyperv@vger.kernel.org,
linux-fbdev@vger.kernel.org, dri-devel@lists.freedesktop.org
Cc: mikelley@microsoft.com
Subject: [PATCH 1/1] video: hyperv_fb: Add ratelimit on error message
Date: Tue, 20 Apr 2021 08:44:19 -0700 [thread overview]
Message-ID: <1618933459-10585-1-git-send-email-mikelley@microsoft.com> (raw)
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>
---
drivers/video/fbdev/hyperv_fb.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/video/fbdev/hyperv_fb.c b/drivers/video/fbdev/hyperv_fb.c
index 4dc9077..a7e6eea 100644
--- a/drivers/video/fbdev/hyperv_fb.c
+++ b/drivers/video/fbdev/hyperv_fb.c
@@ -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;
}
--
1.8.3.1
next reply other threads:[~2021-04-20 15:44 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-20 15:44 Michael Kelley [this message]
2021-04-20 19:48 ` [PATCH 1/1] video: hyperv_fb: Add ratelimit on error message Wei Liu
2021-04-20 19:58 ` Joe Perches
2021-04-21 15:27 ` Michael Kelley
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