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commit81bd5d0c62upstream. When BT module can't be initialized, but it has an IRQ, unloading the driver WARNs when trying to free not-yet-requested IRQ. Fix it by noting whether the IRQ was requested. WARNING: CPU: 2 PID: 214 at kernel/irq/devres.c:144 devm_free_irq+0x49/0x4ca [...] WARNING: CPU: 2 PID: 214 at kernel/irq/manage.c:1746 __free_irq+0x8b/0x27c Trying to free already-free IRQ 264 Modules linked in: hci_uart(-) btbcm bluetooth ecdh_generic ecc libaes CPU: 2 PID: 214 Comm: rmmod Tainted: G W 5.6.1mq-00044-ga5f9ea098318-dirty #928 [...] [<b016aefb>] (devm_free_irq) from [<af8ba1ff>] (bcm_close+0x97/0x118 [hci_uart]) [<af8ba1ff>] (bcm_close [hci_uart]) from [<af8b736f>] (hci_uart_unregister_device+0x33/0x3c [hci_uart]) [<af8b736f>] (hci_uart_unregister_device [hci_uart]) from [<b035930b>] (serdev_drv_remove+0x13/0x20) [<b035930b>] (serdev_drv_remove) from [<b037093b>] (device_release_driver_internal+0x97/0x118) [<b037093b>] (device_release_driver_internal) from [<b0370a0b>] (driver_detach+0x2f/0x58) [<b0370a0b>] (driver_detach) from [<b036f855>] (bus_remove_driver+0x41/0x94) [<b036f855>] (bus_remove_driver) from [<af8ba8db>] (bcm_deinit+0x1b/0x740 [hci_uart]) [<af8ba8db>] (bcm_deinit [hci_uart]) from [<af8ba86f>] (hci_uart_exit+0x13/0x30 [hci_uart]) [<af8ba86f>] (hci_uart_exit [hci_uart]) from [<b01900bd>] (sys_delete_module+0x109/0x1d0) [<b01900bd>] (sys_delete_module) from [<b0101001>] (ret_fast_syscall+0x1/0x5a) [...] Cc: stable@vger.kernel.org Fixes:6cc4396c88("Bluetooth: hci_bcm: Add wake-up capability") Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl> Signed-off-by: Marcel Holtmann <marcel@holtmann.org> 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.