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[ Upstream commit de5d7d3f27ddd4046736f558a40e252ddda82013 ] list_empty(&hdev->adv_instances) is always true during startup, so an advertising instance is added by default. Call trace: dump_backtrace+0x94/0xec show_stack+0x18/0x24 dump_stack_lvl+0x48/0x60 dump_stack+0x18/0x24 hci_setup_ext_adv_instance_sync+0x17c/0x328 hci_powered_update_adv_sync+0xb4/0x12c hci_powered_update_sync+0x54/0x70 hci_power_on_sync+0xe4/0x278 hci_set_powered_sync+0x28/0x34 set_powered_sync+0x40/0x58 hci_cmd_sync_work+0x94/0x100 process_one_work+0x168/0x444 worker_thread+0x378/0x3f4 kthread+0x108/0x10c ret_from_fork+0x10/0x20 Link: https://github.com/bluez/bluez/issues/1442 Signed-off-by: Yang Li <yang.li@amlogic.com> Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com> Signed-off-by: Sasha Levin <sashal@kernel.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.