From patchwork Fri Oct 4 00:30:30 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Aaron Thompson X-Patchwork-Id: 13821715 Received: from smtp-out0.aaront.org (smtp-out0.aaront.org [52.10.12.108]) (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 7DB02A955; Fri, 4 Oct 2024 00:31:37 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=52.10.12.108 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728001899; cv=none; b=LXCPLqIpxvZZH/s28BY7pkvemPVA9Qt6by+DWlOyJ/KNUpITsPZhn/MO/R3yxfFOKy0g0V9R0MPPqgx9sgkaqpdmF9rv/RogyIZuLav4EupVZaSRwKYALadRSQu4TA+nLOnuHsU8Tvtd5qQWwHQZRJXuJVCzr+rL4gBfq0AnPlE= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728001899; c=relaxed/simple; bh=f0FQOyiYq7FpaBC/Z+gvQXYwpERUJNHDeFsnskdp8kg=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=cIlx4MYu1Sj/6SzQKiJOqMb0F387i3Jc5bBUHcpfzCyOQbawOx2o2c/tlyt18FMWWy7plGpEmeC6NjHdJsBbCrIjySC8cZe8XavxB1scDZgLN7m4lt4A+YlxQou80JzCFmbGYoIuEJ8OZKQ9ZPe4jGq7YNJKicFJl+g2GodOlaM= 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=BaUcvNxo; dkim=pass (2048-bit key) header.d=aaront.org header.i=@aaront.org header.b=RYzUmZTC; arc=none smtp.client-ip=52.10.12.108 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="BaUcvNxo"; dkim=pass (2048-bit key) header.d=aaront.org header.i=@aaront.org header.b="RYzUmZTC" Received: by smtp-out0.aaront.org (Postfix) with ESMTP id 4XKTxj0NhpzRj; Fri, 4 Oct 2024 00:31:37 +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=bgzxjfijqntwovyv; bh= f0FQOyiYq7FpaBC/Z+gvQXYwpERUJNHDeFsnskdp8kg=; b=BaUcvNxo9vK/8Y9J +SKv7rgse3m3vjeAeGt0M451L15SmSrzYNnmkHl9RIZykMapV2JCcxUbDJpverVh HBEwAA== 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=elwxqanhxhag6erl; bh= f0FQOyiYq7FpaBC/Z+gvQXYwpERUJNHDeFsnskdp8kg=; b=RYzUmZTCxYVdJUAq FDkVjIAy2EyvrYyJgzVF3xozkaeMgRKz6Ht4J/hHAqQ3l4dRPKKZQM0phu011sU8 YZuYBNCSahCg9yR6l1zQNTfbW/ojBR2IrATVS6b9dqR4bNRb7RIw5SJREASVWcFo ho1Lc3dP0kELPM04St0kpAZuwuQwM8P/wvas85DFp+VNEEPY2Z1GZKwlxKXo+ytr 0FACIeLA2VL+gU+oZr1sHQdwC3puUGDQ3G2Nyvp1CmoBgRQh4wG/0+IG4whKNte6 FC77CRtDVyfvKmWJKMn9KBxtLlhKpHfsY0MbbuFfh8L+HN7XDKnl+z2PrJSx6SlQ mQryWA== From: Aaron Thompson To: Johan Hedberg , Luiz Augusto von Dentz , Marcel Holtmann , linux-bluetooth@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Aaron Thompson , stable@vger.kernel.org Subject: [PATCH 3/3] Bluetooth: Remove debugfs directory on module init failure Date: Fri, 4 Oct 2024 00:30:30 +0000 Message-Id: <20241004003030.160721-4-dev@aaront.org> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20241004003030.160721-1-dev@aaront.org> References: <20241004003030.160721-1-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 67604ccec2f4..0d4b171b939a 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; }