linux-kernel - Re: [PATCH 2/2] bluetooth: hci_bcm: fix freeing not-requested IRQ

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Message-Id: <8D205F06-4D72-4FD0-AB49-BDFCDADAB9A1@holtmann.org>
Date:   Fri, 3 Apr 2020 08:41:31 +0200
From:   Marcel Holtmann <marcel@...tmann.org>
To:     Michał Mirosław <mirq-linux@...e.qmqm.pl>
Cc:     Johan Hedberg <johan.hedberg@...il.com>,
        Frederic Danis <frederic.danis@...ux.intel.com>,
        Guillaume La Roque <glaroque@...libre.com>,
        Kevin Hilman <khilman@...libre.com>,
        linux-bluetooth@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] bluetooth: hci_bcm: fix freeing not-requested IRQ

Hi Michal,

> 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@...r.kernel.org
> Fixes: 6cc4396c8829 ("Bluetooth: hci_bcm: Add wake-up capability")
> Signed-off-by: Michał Mirosław <mirq-linux@...e.qmqm.pl>
> ---
> drivers/bluetooth/hci_bcm.c | 5 ++++-
> 1 file changed, 4 insertions(+), 1 deletion(-)

patch has been applied to bluetooth-next tree.

Regards

Marcel