linux-kernel - [PATCH] Bluetooth: silence a dmesg error message in hci

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Message-Id: <20221116202856.55847-1-mat.jonczyk@o2.pl>
Date:   Wed, 16 Nov 2022 21:28:56 +0100
From:   Mateusz Jończyk <mat.jonczyk@...pl>
To:     linux-bluetooth@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Mateusz Jończyk <mat.jonczyk@...pl>,
        Brian Gix <brian.gix@...el.com>,
        Luiz Augusto von Dentz <luiz.von.dentz@...el.com>,
        Marcel Holtmann <marcel@...tmann.org>,
        Johan Hedberg <johan.hedberg@...il.com>
Subject: [PATCH] Bluetooth: silence a dmesg error message in hci_request.c

On kernel 6.1-rcX, I have been getting the following dmesg error message
on every boot, resume from suspend and rfkill unblock of the Bluetooth
device:

	Bluetooth: hci0: HCI_REQ-0xfcf0

After some investigation, it turned out to be caused by
commit dd50a864ffae ("Bluetooth: Delete unreferenced hci_request code")
which modified hci_req_add() in net/bluetooth/hci_request.c to always
print an error message when it is executed. In my case, the function was
executed by msft_set_filter_enable() in net/bluetooth/msft.c, which
provides support for Microsoft vendor opcodes.

As explained by Brian Gix, "the error gets logged because it is using a
deprecated (but still working) mechanism to issue HCI opcodes" [1]. So
this is just a debugging tool to show that a deprecated function is
executed. As such, it should not be included in the mainline kernel.
See for example
commit 771c035372a0 ("deprecate the '__deprecated' attribute warnings entirely and for good")
Additionally, this error message is cryptic and the user is not able to
do anything about it.

[1]
Link: https://lore.kernel.org/lkml/beb8dcdc3aee4c5c833aa382f35995f17e7961a1.camel@intel.com/

Fixes: dd50a864ffae ("Bluetooth: Delete unreferenced hci_request code")
Signed-off-by: Mateusz Jończyk <mat.jonczyk@...pl>
Cc: Brian Gix <brian.gix@...el.com>
Cc: Luiz Augusto von Dentz <luiz.von.dentz@...el.com>
Cc: Marcel Holtmann <marcel@...tmann.org>
Cc: Johan Hedberg <johan.hedberg@...il.com>
---
 net/bluetooth/hci_request.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/bluetooth/hci_request.c b/net/bluetooth/hci_request.c
index 5a0296a4352e..f7e006a36382 100644
--- a/net/bluetooth/hci_request.c
+++ b/net/bluetooth/hci_request.c
@@ -269,7 +269,7 @@ void hci_req_add_ev(struct hci_request *req, u16 opcode, u32 plen,
 void hci_req_add(struct hci_request *req, u16 opcode, u32 plen,
 		 const void *param)
 {
-	bt_dev_err(req->hdev, "HCI_REQ-0x%4.4x", opcode);
+	bt_dev_dbg(req->hdev, "HCI_REQ-0x%4.4x", opcode);
 	hci_req_add_ev(req, opcode, plen, param, 0);
 }

base-commit: 094226ad94f471a9f19e8f8e7140a09c2625abaa
-- 
2.25.1