From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id F30A72C15B2; Tue, 31 Mar 2026 16:50:08 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774975809; cv=none; b=rtSamnAxeHLDrotgf6zisnhNU+60nruuiWrNEEddmq4+eObIZ4JGKYvOfkaW+hH2slUNjpShdMUDcXSTtleAPvNmhN2HKNrD3HtwRXfN1s+Zavbz+pm8dW26nAuDxEyVRMe4nhlFohCcYJDGdpKSDMxW0EP45yoof3zlpvqOhFE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774975809; c=relaxed/simple; bh=QAKmJOijuJFuvO1pj6OmxijyB1hlvcaAz/44aTorOJo=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=ki6UkMprb/8QhFA6mfqFI/ZYTjdAK2lu8eexU3V5qR5hUNwL8tNzw+xOeQikxwy0qJ0rIM36AaVkd54/yzCMNgQmO/CDxgLRjYg/8IKYzjCM4dlTlOUXDzaxw8x0WzVy1p7vq5G+bWAg4hda3F0QZ/9Aaj4lWVg3X7fhy+mqGyY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=Q/Tob3b9; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="Q/Tob3b9" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0E555C19423; Tue, 31 Mar 2026 16:50:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1774975808; bh=QAKmJOijuJFuvO1pj6OmxijyB1hlvcaAz/44aTorOJo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Q/Tob3b95vvv09O09TT+D4HHdLIE738ckQLaAEbnQq7xvwlfP+Us/UJtVampU9HSO +dZe5sT7Hl3JgTs2mMTJTr96BuJxf7OFiIHP9/5o/r6OYswLoMag6kp476q87KjhwA IChDMWeGGH69+OEXajNWuwT9kFWY0AzK/MDlneT4= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Zhang Chen , Luiz Augusto von Dentz , Sasha Levin Subject: [PATCH 6.12 094/244] Bluetooth: L2CAP: Fix send LE flow credits in ACL link Date: Tue, 31 Mar 2026 18:20:44 +0200 Message-ID: <20260331161745.148143250@linuxfoundation.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260331161741.651718120@linuxfoundation.org> References: <20260331161741.651718120@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.12-stable review patch. If anyone has any objections, please let me know. ------------------ From: Zhang Chen [ Upstream commit f39f905e55f529b036321220af1ba4f4085564a5 ] When the L2CAP channel mode is L2CAP_MODE_ERTM/L2CAP_MODE_STREAMING, l2cap_publish_rx_avail will be called and le flow credits will be sent in l2cap_chan_rx_avail, even though the link type is ACL. The logs in question as follows: > ACL Data RX: Handle 129 flags 0x02 dlen 12 L2CAP: Unknown (0x16) ident 4 len 4 40 00 ed 05 < ACL Data TX: Handle 129 flags 0x00 dlen 10 L2CAP: Command Reject (0x01) ident 4 len 2 Reason: Command not understood (0x0000) Bluetooth: Unknown BR/EDR signaling command 0x16 Bluetooth: Wrong link type (-22) Fixes: ce60b9231b66 ("Bluetooth: compute LE flow credits based on recvbuf space") Signed-off-by: Zhang Chen Signed-off-by: Luiz Augusto von Dentz Signed-off-by: Sasha Levin --- net/bluetooth/l2cap_core.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/net/bluetooth/l2cap_core.c b/net/bluetooth/l2cap_core.c index c65724d19fcfe..58679045093a9 100644 --- a/net/bluetooth/l2cap_core.c +++ b/net/bluetooth/l2cap_core.c @@ -6554,6 +6554,10 @@ static void l2cap_chan_le_send_credits(struct l2cap_chan *chan) struct l2cap_le_credits pkt; u16 return_credits = l2cap_le_rx_credits(chan); + if (chan->mode != L2CAP_MODE_LE_FLOWCTL && + chan->mode != L2CAP_MODE_EXT_FLOWCTL) + return; + if (chan->rx_credits >= return_credits) return; -- 2.51.0