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 51AFF2580F0; Thu, 3 Apr 2025 19:07:36 +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=1743707256; cv=none; b=asuF7FaokO5fK2+Kp361l6pejZfqNkMGl07zSkFOe79yRwAAm1imLmKdAuhBPbpphzDvTM0TNFk6qhBOpZWeNy6TwX6UaapUC1LcsjZpwoecTM/GRhuuf3KDCl9Uke7UckM+O61u1lbWeOMVewxiXkzGspDYbSXUJj5hhx3EGA0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1743707256; c=relaxed/simple; bh=Kl9ppF1QSBXusOfJOzuBGCWn7GSZsqZaGeSpGAHc+HU=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=ghXhOpiTJTxtXk4wSvD2/s+zQZA0aCn6aLfDcDIYMnrIIUgFJ4xozn+SpKw1NuvaIO4wuWiu4NC1SKUdfvA7azE1HshLLg+6H061eDhO904xQaNFH/6X/DlX7mBHfsv+MbgE3ScELf9ty8Z1imY3kjtCy5bPJ4qcAL3axhGAlKk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=qwgUy2lG; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="qwgUy2lG" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4E343C4CEEE; Thu, 3 Apr 2025 19:07:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1743707256; bh=Kl9ppF1QSBXusOfJOzuBGCWn7GSZsqZaGeSpGAHc+HU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=qwgUy2lGyoGYp692uMdQTgwSh2RZ3/iwbWP49/QbW8kXbMrTMHmjUQvFRy7U7A1Ie bSNHBnmhAsRxy5EmgeReqPt/kigfxCYsYXKkEv4pAr5YV2FdCGgTuV/P1IbkF4iAWQ Y1cSyzGTcd7JwPOMJgEoT7iaZzpJ9H4eIG4LCayjPv4am51uPsMl0ZSqUgEd7MknIH TXqAHWYf10yO0BKXmOGrsn7E96rc8CQNG+cx4PMIGZmZtzwTWwDywpHaTqrMbUoGW/ kfbpzWRmQfaNasaxOkXaVXyaL1AvER/Ew3enFUyrJcjQYLr464/yTPufXzRKlnwiul BRCOdsgh+tFoQ== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Arseniy Krasnov , Luiz Augusto von Dentz , Sasha Levin , marcel@holtmann.org, luiz.dentz@gmail.com, linux-bluetooth@vger.kernel.org Subject: [PATCH AUTOSEL 6.12 42/47] Bluetooth: hci_uart: fix race during initialization Date: Thu, 3 Apr 2025 15:05:50 -0400 Message-Id: <20250403190555.2677001-42-sashal@kernel.org> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20250403190555.2677001-1-sashal@kernel.org> References: <20250403190555.2677001-1-sashal@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore X-stable-base: Linux 6.12.21 Content-Transfer-Encoding: 8bit From: Arseniy Krasnov [ Upstream commit 366ceff495f902182d42b6f41525c2474caf3f9a ] 'hci_register_dev()' calls power up function, which is executed by kworker - 'hci_power_on()'. This function does access to bluetooth chip using callbacks from 'hci_ldisc.c', for example 'hci_uart_send_frame()'. Now 'hci_uart_send_frame()' checks 'HCI_UART_PROTO_READY' bit set, and if not - it fails. Problem is that 'HCI_UART_PROTO_READY' is set after 'hci_register_dev()', and there is tiny chance that 'hci_power_on()' will be executed before setting this bit. In that case HCI init logic fails. Patch moves setting of 'HCI_UART_PROTO_READY' before calling function 'hci_uart_register_dev()'. Signed-off-by: Arseniy Krasnov Signed-off-by: Luiz Augusto von Dentz Signed-off-by: Sasha Levin --- drivers/bluetooth/hci_ldisc.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/bluetooth/hci_ldisc.c b/drivers/bluetooth/hci_ldisc.c index 395d66e32a2ea..2651e2e33f2a1 100644 --- a/drivers/bluetooth/hci_ldisc.c +++ b/drivers/bluetooth/hci_ldisc.c @@ -707,12 +707,13 @@ static int hci_uart_set_proto(struct hci_uart *hu, int id) hu->proto = p; + set_bit(HCI_UART_PROTO_READY, &hu->flags); + err = hci_uart_register_dev(hu); if (err) { return err; } - set_bit(HCI_UART_PROTO_READY, &hu->flags); return 0; } -- 2.39.5