From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 7298D3BB136; Sat, 12 Sep 2026 20:05:58 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789243560; cv=none; b=jvBs6BennM9jToCLgwsJ0XNvMo2woLeyzpLUtnne6bJ1JnmKn/AoY2sUcBaKo+Y3Rwo1FsLMARMJjPVqQVZ0mvV4GEgWwQEuRstZA8i+eD9+892zSpAW4itgZUmPrAVU5WlssXrjWv1/nXMrgJfMs87MDz7Z9GemJOqVFsq37Uw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789243560; c=relaxed/simple; bh=89gVWn0XI3bB8wOVjHDA8ecfRR/am6CJ0IPMdpAQmgA=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=pjccnhOEf7fBaY//GoJMtDX3h0eUaSzGgSTKPRnCZ75KmUfYq6+1IPuHGiaml2JB6LZZSICD9U9r+1LfOot+QFesxF+L8p4pjZLZC7SWambH2ok4O/n0E8MEEYQrxvjmeDIr0r5SMs0HPaZeiVNrBYrRSa1eefZyUcrDlEyWKaE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=ppn3lIfK; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="ppn3lIfK" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6D6B11F000FF; Sat, 12 Sep 2026 20:05:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1789243558; bh=rqLu4texlv3CKf5g7U008antpTDEHvzMr7NSNTWhavU=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=ppn3lIfKzsJ0B6mOsSdJT8Tzj//NuZdzmv7u6HNqc20XtLcYa5x6x7qEkt4Jp1bsu 6GoDU14yPee1m2Ba5fo31wpiHoId1NJpuPFGvOyvChcH3Fqk4RzjRQTizvGN+mSQX0 xQcTK6gxN3QbEk4iQ+22UR3gT4df0J4QXbVsox9g= 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 5.10 798/798] Bluetooth: L2CAP: Fix send LE flow credits in ACL link Date: Sat, 12 Sep 2026 09:07:06 +0200 Message-ID: <20260912065535.351136279@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260912065516.948645775@linuxfoundation.org> References: <20260912065516.948645775@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.10-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 f59146ae72439..1122566c4b500 100644 --- a/net/bluetooth/l2cap_core.c +++ b/net/bluetooth/l2cap_core.c @@ -7781,6 +7781,10 @@ 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; -- 2.53.0