From patchwork Fri Oct 4 23:04:10 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Aaron Thompson X-Patchwork-Id: 13823071 Received: from smtp-out1.aaront.org (smtp-out1.aaront.org [52.0.59.53]) (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 C39D61514FB; Fri, 4 Oct 2024 23:04:58 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=52.0.59.53 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728083100; cv=none; b=SIw2KkdkEYP6jVJVX22jesl8knKQSeAyrJ66Op4whoINamjWkBuHC6sQfjvwgEC6kszNBJEmvc1rxymo+KsqyTCREBiy1BnPAVETB6USd/fWbBrUBZbOoR/iwBxHBUwyaF1Qtv41PyPQACtuPmY1o5zWSgifiGNeHXi+OZvFe7g= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728083100; c=relaxed/simple; bh=GXAjDisMoyLwQzUTKYzMVSa+TUKX6Km3nnqbIjEYk2M=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=rTbOXsDQa6PbtLkJLtNJdws3ncMpFOfQIsRj0HZY07+/VtnbFc+lr5QUaCzSFXY/X0ZI8UBxCe6E6xm0amrg6giEYMQa0iw3ZfQa2F+TYPCneMv0g+4T0l8VwBrl7QvxWEgez7580UfVUvtq1n7jzJLPMclHG+/w1XTDUgKaKv8= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=aaront.org; spf=pass smtp.mailfrom=aaront.org; dkim=permerror (0-bit key) header.d=aaront.org header.i=@aaront.org header.b=EmRgQN6s; dkim=pass (2048-bit key) header.d=aaront.org header.i=@aaront.org header.b=taiYZnGu; arc=none smtp.client-ip=52.0.59.53 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=aaront.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=aaront.org Authentication-Results: smtp.subspace.kernel.org; dkim=permerror (0-bit key) header.d=aaront.org header.i=@aaront.org header.b="EmRgQN6s"; dkim=pass (2048-bit key) header.d=aaront.org header.i=@aaront.org header.b="taiYZnGu" Received: by smtp-out1.aaront.org (Postfix) with ESMTP id 4XL3zG0mnYzhc; Fri, 4 Oct 2024 23:04:58 +0000 (UTC) DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/simple; d=aaront.org; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; s=habm2wya2ukbsdan; bh= GXAjDisMoyLwQzUTKYzMVSa+TUKX6Km3nnqbIjEYk2M=; b=EmRgQN6sE1l6bqyi vFegWB+X8ymQlNaIRv8zLKBbw9mjI0hyv4xI9FsjAYMP6Nb0ZRCmfFUH5aFMvLI/ TIjUBw== DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=aaront.org; h= from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; s=qkjur4vrxk6kmqfk; bh= GXAjDisMoyLwQzUTKYzMVSa+TUKX6Km3nnqbIjEYk2M=; b=taiYZnGugeAww4/X frnVl5z3HiwfLamfU3GfMVjZOu13ScBI4IFQwcqDxPhvnNilOsVZAQxUVo3/WcGU gR7VEofOdyJEBwI931+trFtjWWbmDEi/FeAQbLHJQ4Hed+Gzm7J0AVY+psVzYMVY T9QKaNhOplVuSiFNSk2eOh2f991USI05+6TQ8PD2ISr7RxoTqBjxtbiqiK8e/tGA XVwukyPbxNa4HO9rJ+5PC/Vti5Q1WFmQITylVUYzKzCcpAPW8jaYbpFNP4K6tS+N UNLutAhFT45/cbP06YLC5AN11yQKY2kNFG7kvI5HXMxII7V3u9CzdFtROSLnrC9b 4Eyrxw== From: Aaron Thompson To: Johan Hedberg , Luiz Augusto von Dentz , Marcel Holtmann , linux-bluetooth@vger.kernel.org, linux-kernel@vger.kernel.org Cc: stable@vger.kernel.org, Aaron Thompson Subject: [PATCH v2 3/3] Bluetooth: Remove debugfs directory on module init failure Date: Fri, 4 Oct 2024 23:04:10 +0000 Message-Id: <20241004230410.299824-4-dev@aaront.org> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20241004230410.299824-1-dev@aaront.org> References: <20241004230410.299824-1-dev@aaront.org> Precedence: bulk X-Mailing-List: linux-bluetooth@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Aaron Thompson If bt_init() fails, the debugfs directory currently is not removed. If the module is loaded again after that, the debugfs directory is not set up properly due to the existing directory. # modprobe bluetooth # ls -laF /sys/kernel/debug/bluetooth total 0 drwxr-xr-x 2 root root 0 Sep 27 14:26 ./ drwx------ 31 root root 0 Sep 27 14:25 ../ -r--r--r-- 1 root root 0 Sep 27 14:26 l2cap -r--r--r-- 1 root root 0 Sep 27 14:26 sco # modprobe -r bluetooth # ls -laF /sys/kernel/debug/bluetooth ls: cannot access '/sys/kernel/debug/bluetooth': No such file or directory # # modprobe bluetooth modprobe: ERROR: could not insert 'bluetooth': Invalid argument # dmesg | tail -n 6 Bluetooth: Core ver 2.22 NET: Registered PF_BLUETOOTH protocol family Bluetooth: HCI device and connection manager initialized Bluetooth: HCI socket layer initialized Bluetooth: Faking l2cap_init() failure for testing NET: Unregistered PF_BLUETOOTH protocol family # ls -laF /sys/kernel/debug/bluetooth total 0 drwxr-xr-x 2 root root 0 Sep 27 14:31 ./ drwx------ 31 root root 0 Sep 27 14:26 ../ # # modprobe bluetooth # dmesg | tail -n 7 Bluetooth: Core ver 2.22 debugfs: Directory 'bluetooth' with parent '/' already present! NET: Registered PF_BLUETOOTH protocol family Bluetooth: HCI device and connection manager initialized Bluetooth: HCI socket layer initialized Bluetooth: L2CAP socket layer initialized Bluetooth: SCO socket layer initialized # ls -laF /sys/kernel/debug/bluetooth total 0 drwxr-xr-x 2 root root 0 Sep 27 14:31 ./ drwx------ 31 root root 0 Sep 27 14:26 ../ # Cc: stable@vger.kernel.org Fixes: ffcecac6a738 ("Bluetooth: Create root debugfs directory during module init") Signed-off-by: Aaron Thompson --- net/bluetooth/af_bluetooth.c | 1 + 1 file changed, 1 insertion(+) diff --git a/net/bluetooth/af_bluetooth.c b/net/bluetooth/af_bluetooth.c index 9425d0680844..e39fba5565c5 100644 --- a/net/bluetooth/af_bluetooth.c +++ b/net/bluetooth/af_bluetooth.c @@ -825,6 +825,7 @@ static int __init bt_init(void) bt_sysfs_cleanup(); cleanup_led: bt_leds_cleanup(); + debugfs_remove_recursive(bt_debugfs); return err; }