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59bd80df4b
commit 1db4564f101b47188c1b71696bd342ef09172b22 upstream.
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: ffcecac6a7 ("Bluetooth: Create root debugfs directory during module init")
Signed-off-by: Aaron Thompson <dev@aaront.org>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.