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 B8BED423A7C; Tue, 31 Mar 2026 16:38:24 +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=1774975104; cv=none; b=asl3/0/gbWPCOo49U3oPWO6X0DF+66hclpsD7IE7SYTZ456JFmApFqBiy6zNQCwb5kin2ChQgPU/vn5NkZmVmYB8nALLivA9ggIfXhhfClubcgsx7GBx9th7d5EYbO3W4odaz1+Vq0qIT/99Ry2sOtYykCq/U+QzbTLet0Oka4Y= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774975104; c=relaxed/simple; bh=YeHZ289FLAbtf4fBeVWC2cLTIhYagnF7ynvOg/RFtC4=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=QOLDt6k+DBFElpRFBaq+1WL2+EV0RDgyqDvdv/lLon8uCTnTXe3QW3FFZA+upKgOYtid/OHZ2xt4bMUKaRSsoPc28tYwUvOSq/LQVKsnK4QVyivtynBvugmYJ8BhC7aXSGDonX2kwP9j/27jPHGtXMxJMJLGe6sajJljOe9AcUY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=04WYhfOx; 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="04WYhfOx" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 008C1C19423; Tue, 31 Mar 2026 16:38:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1774975104; bh=YeHZ289FLAbtf4fBeVWC2cLTIhYagnF7ynvOg/RFtC4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=04WYhfOxU4G/M3g8olIoCpkHERksLL59YgTTcWbW+o8ltom+h3733rk2WA/eCAA5r TQb3u9TClWeA3MWTwpW9g+x6Sfnch/LlqWhLjXvmCQNPJDu7nSa8xuOQUWIltQblDX vgigEv1BSe42JMXoxlECqwe4DlYe0SyZDDl2ojY4= 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 6.19 133/342] Bluetooth: L2CAP: Fix send LE flow credits in ACL link Date: Tue, 31 Mar 2026 18:19:26 +0200 Message-ID: <20260331161803.901025626@linuxfoundation.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260331161758.909578033@linuxfoundation.org> References: <20260331161758.909578033@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 6.19-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 848a9b945de89..b5e393e4f3eb1 100644 --- a/net/bluetooth/l2cap_core.c +++ b/net/bluetooth/l2cap_core.c @@ -6589,6 +6589,10 @@ 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