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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Michael Kelley <mikelley@microsoft.com>,
        "Andrea Parri (Microsoft)" <parri.andrea@gmail.com>,
        Wei Liu <wei.liu@kernel.org>, Sasha Levin <sashal@kernel.org>
Subject: [PATCH 5.11 189/601] Drivers: hv: vmbus: Drop error message when No request id available
Date:   Wed, 12 May 2021 16:44:26 +0200
Message-Id: <20210512144834.061510604@linuxfoundation.org>
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From: Andrea Parri (Microsoft) <parri.andrea@gmail.com>

[ Upstream commit 0c85c54bf7faeb80c6b76901ed77d93acef0207d ]

Running out of request IDs on a channel essentially produces the same
effect as running out of space in the ring buffer, in that -EAGAIN is
returned.  The error message in hv_ringbuffer_write() should either be
dropped (since we don't output a message when the ring buffer is full)
or be made conditional/debug-only.

Suggested-by: Michael Kelley <mikelley@microsoft.com>
Signed-off-by: Andrea Parri (Microsoft) <parri.andrea@gmail.com>
Fixes: e8b7db38449ac ("Drivers: hv: vmbus: Add vmbus_requestor data structure for VMBus hardening")
Link: https://lore.kernel.org/r/20210301191348.196485-1-parri.andrea@gmail.com
Signed-off-by: Wei Liu <wei.liu@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/hv/ring_buffer.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/drivers/hv/ring_buffer.c b/drivers/hv/ring_buffer.c
index 35833d4d1a1d..ecd82ebfd5bc 100644
--- a/drivers/hv/ring_buffer.c
+++ b/drivers/hv/ring_buffer.c
@@ -313,7 +313,6 @@ int hv_ringbuffer_write(struct vmbus_channel *channel,
 		rqst_id = vmbus_next_request_id(&channel->requestor, requestid);
 		if (rqst_id == VMBUS_RQST_ERROR) {
 			spin_unlock_irqrestore(&outring_info->ring_lock, flags);
-			pr_err("No request id available\n");
 			return -EAGAIN;
 		}
 	}
-- 
2.30.2