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 DA12F37E2F3; Sat, 12 Sep 2026 19:19:06 +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=1789240748; cv=none; b=Ai5mb2dtygDAEBJG7pMlYpokfrV7e5RF3pKlp4hljcC99PFpnBJqEgml7TicVwOAl9Cc0I0k2FO/+0U9bOzq8ynsHyC4RCLNsFOglxkw+Y30ZPADBJqevoEgcOAgcshYot4T6ATIG3FpIL2CMhh8wtYqIFHKK1IWJq2D/kMe0u4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789240748; c=relaxed/simple; bh=brpna8QAr+8AfZUhGQQQP8ANzuPUEvAbRmKBN/1YY9w=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=RAoWzxWJY4/+L0MYufDdKrzgkgwsuEFy7okZ4JRElmsz9N0m0Yb1+ekqVoxmSFe64gAg8pf3GCQWVNYJ31w3kfjr9kWl2An6VmWcyLLvPJE4MAShrtje0NEcPamd9gB5FeaZEd51OQqNiMSa1vtFIX+dwnxwIDu/6svLh3PF22s= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=yeF/8obE; 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="yeF/8obE" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 8F7031F000FF; Sat, 12 Sep 2026 19:19:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1789240746; bh=3Ac9rUaDkAkricXFV8crdmO7AOEE7RLIfkD0kuj5zSo=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=yeF/8obEVbeYcJsvvIoZ3LgdjefolVIrTZCmG/fPbR060mcdfZxPuLnGNwQOG4YHC hGScpvO+pqR/R5B6DHIqAf7oilPF6Qf3KwLUHcil7LpDr5Y8Czs/IAptIRTcdrCQpk Tc+3bp5sTsFzlLihqaJYm3U8cGHzKxv7B4A+hHcw= 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 5.15 931/935] Bluetooth: L2CAP: Fix send LE flow credits in ACL link Date: Sat, 12 Sep 2026 09:06:01 +0200 Message-ID: <20260912065548.175787565@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260912065526.833703348@linuxfoundation.org> References: <20260912065526.833703348@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 5.15-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 f9a5d118e5e67..bd9dfd35f9097 100644 --- a/net/bluetooth/l2cap_core.c +++ b/net/bluetooth/l2cap_core.c @@ -7771,6 +7771,10 @@ 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