From patchwork Tue Mar 5 18:23:49 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yuxin Wang X-Patchwork-Id: 13582836 Received: from mail-wm1-f42.google.com (mail-wm1-f42.google.com [209.85.128.42]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 8FA3718628; Tue, 5 Mar 2024 18:24:03 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.42 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1709663045; cv=none; b=RDj+NKqQDDM/7abhINDV8b/ezXrl4hqMacqi55gpVAkpJ32dgXQE16OkQZJMqZorXsv1tYku9HJxingtUy8PD5jgcy0cQiQBY2a+QuboDphrs+0h4npFgeSLkQW5t+kozSxXCw6/xNI5WgeXxGsBOKzJmX5OtsNpNNz2VMwahRo= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1709663045; c=relaxed/simple; bh=TdfupDTf1t5grk4CAdN9p9bu1bJf5wgJEBrWS5hljOg=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=eT4eGTUeBsinTB1b+uRUm4hCWJfM7CeffWDU3uGxQHwOl5HK7A9cw7n+aAIqLdZP40XjIHhkxq12UD5KePSwm28Z/nZnKrJj1IjlxDAhspwzCWnzWf4dkx8dFDFTcz5N8BIfgDiOaWfXAdvqjgI78Cv51SdzjyIJ6zXzZFhe5nc= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=jJo1F27w; arc=none smtp.client-ip=209.85.128.42 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="jJo1F27w" Received: by mail-wm1-f42.google.com with SMTP id 5b1f17b1804b1-412ee276dc9so6458255e9.1; Tue, 05 Mar 2024 10:24:03 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1709663042; x=1710267842; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=Vewip57IplzR6mytY6eKGIRl6x4l2s/G9UmkfWElT2c=; b=jJo1F27wG6ZlYZ4Lfj3ooioshZis+J3Rtgl3tnC9b+e8wJE9uCiceZ1RaqAODX2Irv mPGzsU18LEkBDqY25FwF5mKi1FQwd3tde6XAdyg1QqCzPFqmnFzHqQLBv576Tsi/x85P cFXMz+cQnr3nwR3fAx8CsDMGPgEwJogQmlnm7xrza0NVoEDDdUzGm8wPqMqR54oPPHNW VkRPSR8JwdOp5RTTYPGPtTsg9ymVGhpjmySwRvTAgjk8ide50dtoq3Q/ID1fMezklk/P T/BZ95NsEJNOx57WSbgz/5mNqEDLwzb9UK0vFrYfu8A5vM/eMZ+s4S+k7BLqt55pSNup ar9Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1709663042; x=1710267842; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=Vewip57IplzR6mytY6eKGIRl6x4l2s/G9UmkfWElT2c=; b=dKz53j1hbJSZoHeZobNXhCPYk3SVtn7msCQyULto/ides2dpTcPySwe/lYIDPZgUYB REvNMBnmFd0T0r2MM0y0wYWBkxMZBiVxnz1bDq4ABUS3x/3U8tK8upNKvscWh8Bpcz04 /GuloAoj7wwS8fNYD7XdVL9TYQFjn504elOTYuMZONbWuo9zck3C1G6EbYCqg8tUI3kB KRra4G6bsH3aU7z+t9KJeTn2AjsEbgiE2i1VPGdHaY/3rzsKpl/RzCfRV/hkv2paYFFn PG6g8ql+DpffTwJEhUKJkgA72vXESQvvvg7WR6PNDicIQJcRJpJBfcCfk39me3EZhRW4 xKgQ== X-Forwarded-Encrypted: i=1; AJvYcCX4/yIQITTCf4EhsMjjyQ24JuNPBOibDRXvFSLBFnO+XTGtPeV+sNWDFB14Km5THBhpbBuGmzfYN3nEOENN7zxwvSBmSKjHcRe6OnqQ X-Gm-Message-State: AOJu0Ywyn23oOlTimPZjxCGcy98aNijkKsZLLgG+Wd+1tu3IZMBRDPqW 8qtX0ozSMQBbGllS5MgV6rxBe7XNgaAPGe+3MM+DMASnjLzdkJl0 X-Google-Smtp-Source: AGHT+IHuLC2lqjmF/KzE+5aw87KqSBEd9s52FBcCsTOYoo6Oei/ieq/y3oovoRv5bXnPKrKBSFxAIw== X-Received: by 2002:a05:600c:3481:b0:412:e676:2ff1 with SMTP id a1-20020a05600c348100b00412e6762ff1mr4363859wmq.41.1709663041649; Tue, 05 Mar 2024 10:24:01 -0800 (PST) Received: from [::1] ([2001:19f0:ac01:93b:5400:4ff:fe77:2098]) by smtp.gmail.com with ESMTPSA id l1-20020a05600c1d0100b00412ea52b102sm3592206wms.34.2024.03.05.10.23.59 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 05 Mar 2024 10:24:01 -0800 (PST) From: Yuxin Wang To: Marcel Holtmann , Johan Hedberg , Luiz Augusto von Dentz Cc: linux-bluetooth@vger.kernel.org, linux-kernel@vger.kernel.org, Yuxin Wang Subject: [PATCH] Bluetooth: Fix inconsistent LE packet sending behaviors Date: Tue, 5 Mar 2024 18:23:49 +0000 Message-Id: <20240305182349.4182578-1-yuxinwang9999@gmail.com> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: linux-bluetooth@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 In the `hci_sched_le` function, the calculation of `quote` within `hci_chan_sent` may become incorrect after breaking from the inner while loop. The issue stems from `hci_chan_sent` using `hdev->le_cnt` instead of the updated `cnt`. As a result, `quote` may exceed `cnt`, leading to a negative `cnt` and causing further inconsistent behaviors. This patch modifies `cnt` to be a pointer, aligning with the pattern used in the nearby `hci_sched_iso` function. Signed-off-by: Yuxin Wang --- net/bluetooth/hci_core.c | 19 +++++++------------ 1 file changed, 7 insertions(+), 12 deletions(-) diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c index 2821a42ce..785a6dde9 100644 --- a/net/bluetooth/hci_core.c +++ b/net/bluetooth/hci_core.c @@ -3750,19 +3750,19 @@ static void hci_sched_le(struct hci_dev *hdev) { struct hci_chan *chan; struct sk_buff *skb; - int quote, cnt, tmp; + int quote, *cnt, tmp; BT_DBG("%s", hdev->name); if (!hci_conn_num(hdev, LE_LINK)) return; - cnt = hdev->le_pkts ? hdev->le_cnt : hdev->acl_cnt; + cnt = hdev->le_pkts ? &hdev->le_cnt : &hdev->acl_cnt; - __check_timeout(hdev, cnt, LE_LINK); + __check_timeout(hdev, *cnt, LE_LINK); - tmp = cnt; - while (cnt && (chan = hci_chan_sent(hdev, LE_LINK, "e))) { + tmp = *cnt; + while (*cnt && (chan = hci_chan_sent(hdev, LE_LINK, "e))) { u32 priority = (skb_peek(&chan->data_q))->priority; while (quote-- && (skb = skb_peek(&chan->data_q))) { BT_DBG("chan %p skb %p len %d priority %u", chan, skb, @@ -3777,7 +3777,7 @@ static void hci_sched_le(struct hci_dev *hdev) hci_send_frame(hdev, skb); hdev->le_last_tx = jiffies; - cnt--; + (*cnt)--; chan->sent++; chan->conn->sent++; @@ -3787,12 +3787,7 @@ static void hci_sched_le(struct hci_dev *hdev) } } - if (hdev->le_pkts) - hdev->le_cnt = cnt; - else - hdev->acl_cnt = cnt; - - if (cnt != tmp) + if (*cnt != tmp) hci_prio_recalculate(hdev, LE_LINK); }