linux-kernel - [char-misc-next] mei: demote client disconnect warning on suspend to debug

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Date: Thu, 30 May 2024 12:14:15 +0300
From: Tomas Winkler <tomas.winkler@...el.com>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Alexander Usyskin <alexander.usyskin@...el.com>,
	Vitaly Lubart <vitaly.lubart@...el.com>,
	linux-kernel@...r.kernel.org,
	Tomas Winkler <tomas.winkler@...el.com>
Subject: [char-misc-next] mei: demote client disconnect warning on suspend to debug

From: Alexander Usyskin <alexander.usyskin@...el.com>

Change level for the "not connected" client message in the write
callback from error to debug.

The MEI driver currently disconnects all clients upon system suspend.
This behavior is by design and user-space applications with
open connections before the suspend are expected to handle errors upon
resume, by reopening their handles, reconnecting,
and retrying their operations.

However, the current driver implementation logs an error message every
time a write operation is attempted on a disconnected client.
Since this is a normal and expected flow after system resume
logging this as an error can be misleading.

Signed-off-by: Alexander Usyskin <alexander.usyskin@...el.com>
Signed-off-by: Tomas Winkler <tomas.winkler@...el.com>
---
 drivers/misc/mei/main.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/misc/mei/main.c b/drivers/misc/mei/main.c
index 79e6f3c1341febe0921b32dd..40c3fe26f76df0a5a7fe192e 100644
--- a/drivers/misc/mei/main.c
+++ b/drivers/misc/mei/main.c
@@ -329,7 +329,7 @@ static ssize_t mei_write(struct file *file, const char __user *ubuf,
 	}

 	if (!mei_cl_is_connected(cl)) {
-		cl_err(dev, cl, "is not connected");
+		cl_dbg(dev, cl, "is not connected");
 		rets = -ENODEV;
 		goto out;
 	}
-- 
2.45.0